MicroTech Series-200 Flooded Screw Chiller

Transcription

1 Open Protocol Data Infomation Packet Version 1.0 Group: Controls Date: February 1997 MicroTech Series-200 Flooded Screw Chiller Open Protocol Data Communications 2002 McQuay International

2 - C O N F I D E N T I A L - This Document may not be copied or reproduced in any way without the express written consent of McQuay International. NOTICE Copyright 1997 McQuay International, Minneapolis MN All rights reserved throughout the world. McQuay International reserves the right to change any information contained herein without prior notice. No guarantees are given as to the accuracy of information provided. MicroTech Series 200 Centrifugal Chiller Open Protocol 2

3 Contents Revision History... 3 Version Overview...4 Introduction... 4 Software Identification... 4 Series-200 Flooded Screw Chiller I/O Configuration...5 Analog Inputs... 5 Digital Inputs... 5 Digital Outputs... 6 Variables...7 Read Only Memory Location Tables... 7 Read Only Memory Definitions Read and Write Memory Location Table...19 Read and Write Memory Definitions Lead/Lag Load Balance Operation...21 Overview Read Only Memory Locations Read/Write Memory Locations Series-200 Flooded Screw Chiller Simulator Package...24 Purpose Development Tools Monitor Installation Hardware Configuration Testing Simulator Monitor Software Guide...26 Logging on to the software Communications Initialization Downloading Simulation code Monitoring a simulator controller Read/Write screens Further Information on Windows Monitor Software Revision History Version 1.0 This is the first release. 3 MicroTech Series 200 Centrifugal Chiller Open Protocol

4 Overview Introduction Software Identification McQuay International s Open Protocol for MicroTech allows independent building automation system companies to integrate McQuay equipment into their building control systems. This information packet details the McQuay Series-200 flooded screw chiller. Automation integrators can communicate with a single chiller or a networked group of chillers with simple RS-232 or RS-485 communications. Using Open Protocol, the integrator has access to relevant monitoring information via read only points. The integrator may also alter the equipment operating state by adjusting specific controller memory locations via read/write. This manual completely defines accessible memory locations and provides instructions on the use of McQuay s Open Protocol Development Kit. This development kit includes a simulator monitor software which is described at the end of this document. With the manual and development kit, a fully functional interface to McQuay Series-200 flooded screw chillers can easily be developed. This Open Protocol document specifically addresses chiller applications utilizing MicroTech Series-200 control software. McQuay has provided a means of verifying the use of Series-200 software by embedding an eight character software identification string in the unit controller s read only memory. The string is written as ASCII characters in a hex number format and is located in memory locations 0A08-0A0F. The table below defines valid identification strings. Address Characters Description 0A08, 0A09, 0A0A P, E, S Defines code Flooded Screw Chiller. (Always the 1st three characters.) 0A0B 2 = R22 Refrigerant type. 3 = R134A 4 = R410A 0A0C E = English Display - Units of measure / language type. S = SI/Metric 0A0D, 0A0E Software version number. 0A0F A-Z Software revision number. Open Protocol compatible codes consist of any above combination in the following format, where * is a wildcard character and may be any valid character from the above table: PES**00* PES**01* PES**02* Note that software revision numbers typically do not affect open protocol information, however, software version number typically indicates a fairly major change in the unit software. This manual covers version numbers 00, 01, and 02. If you have a later version of code on your job. Please contact McQuay for updated Open Protocol documentation when new software versions are released. MicroTech Series 200 Centrifugal Chiller Open Protocol 4

5 Series-200 Flooded Screw Chiller I/O Configuration Analog Inputs Digital Inputs Input Number Description 0 Leaving Evaporator Water Temperature 1 Entering Evaporator Water Temperature 2 Compressor Suction Temperature 3 Chilled Water Reset 4 Demand Limit 5 Refrigerant Leak Detect (Opt) 6 Evaporator Water Flow (Opt) 7 Condenser Water Flow (Opt) 8 Liquid Line Temperature 9 Entering Condenser Water Temperature 10 Leaving Condenser Water Temperature 11 Motor Current 12 Discharge Temperature 13 Unused 14 Unused 15 Unused 16 Evaporator Pressure 17 Condenser Pressure 18 Liquid Line Pressure 19 Voltage Ratio 20 Outdoor Air Temperature 21 Unused 22 Unused Input Number Description 0 Front Panel Switch 1 High Pressure Switch 2 Motor Protect Switch 3 Unused 4 Starter Transition Switch 5 Starter Fault Switch 5 MicroTech Series 200 Centrifugal Chiller Open Protocol

6 Digital Outputs Input Number Description 6 Evaporator Flow Switch 7 Condenser Flow Switch 8 Remote Start/Stop 9 Templifier/Ice Switch 10 Liquid Presence Switch Output Number Description 0 Alarm output 1 Unload 2 Load 3 EXV1 Out 4 EXV2 Out 5 MCR Out 6 MCR Latch Out 7 Solenoid Top Feed Out 8 Solenoid Bottom Feed Out 9 Solenoid Bottom Vent Out 10 Motor Cooling Out 11 Suction LSV Out 12 Hot Gas Bypass Out 13 Cooling Tower 1 14 Cooling Tower 2 15 Cooling Tower 3 16 Cooling Tower 4 17 Evaporator Water Pump 1 18 Evaporator Water Pump 2 19 Condenser Water Pump 1 20 Condenser Water Pump 2 21 Unused 22 Unused 23 Unused MicroTech Series 200 Centrifugal Chiller Open Protocol 6

7 Variables Two byte variables use the following conversion unless otherwise specified: Value=HiByte*255+LoByte. Where HiByte is the first address listed and LoByte is the second address listed. Read Only Memory Location Tables Note: In the following table, all 2 byte memory locations use the following conversion: (First Byte*256+Second Byte) Description Address (Hex) Range (X) Conversion Units/Descript ion Chilled Water Temperature X/2 F Active Setpoint Chiller Unit Temperature Type 0 = Standard 084B 0, 1 1 = Low Temp Communications Signal 0 = No Comm 040C 0,1 1 = Comm OK Compressor Lift Pressure 046A- 0-65,535 X/10 PSIG 046B Compressor Motor Current 044C- 0-65,535 Amps 044D Compressor Motor Current Percent 044A % RLA Compressor Number of Starts 085F Compressor Operating Hours Compressor Suction Temperature Compressor Superheat - Discharge 043A- 043B 046E- 046F Compressor Superheat -Suction 046C- 046D Condenser Approach Temperature Condenser Differential Pressure - Liquid Line ,999 Compressor starts 0-49,999 hrs 600-3,630 63,985 = Short 61,425 = Open (X ) / 10 F 0-2,630 X / 10 ºF 0-2,630 X / 10 ºF 0-2,630 X / 10 F 0-65,535 X / 10 PSI 7 MicroTech Series 200 Centrifugal Chiller Open Protocol

8 Description Condenser Pump Status 0=Condenser Pumps Off 1=Starting Condenser Pump #1 2=Starting Condenser Pump #2 3=Condenser Pump #1 On 4=Condenser Pump #2 On 5=Condenser Pump #1 Fail; Starting #2 6=Condenser Pump #2 Fail; Starting #1 7=Condenser Pumps #1 & #2 Failed Condenser Pump # 1 Operating Hours Condenser Pump # 2 Operating Hours Condenser Refrigerant Pressure Condenser Refrigerant Temperature Condenser Subcooling Temperature Address (Hex) A- 085B 085D- 085E Range (X) Conversion 0-49,999 hrs 0-49,999 hrs 0-4,500 63,985 = Short 61,425 = Open 600-3,630 63,985 = Short 61,425 = Open X / 10 (X ) / 10 Units/Descript ion PSIG F 0-2,630 X / 10 ºF Condenser Water Flow Rate ,535 GPM 0453 Condenser Water Flow Status 0 = No Flow 045F 0, 1 1 = Flow Condenser Water Rate Sensor 0 = Not Present 1 = Present 083D 0, 1 Condenser Water Temperature - Delta Condenser Water Temperature - Entering Condenser Water Temperature - Leaving ,630 X / 10 F 600-3,630 63,985 = Short 61,425 = Open 600-3,630 63,985 = Short 61,425 = Open (X ) / 10 (X ) / 10 Cooling Tower Control 0 = External , 1 1 = Chiller Cooling Tower Stage 049A 0-6 stages F F MicroTech Series 200 Centrifugal Chiller Open Protocol 8

9 Description Address (Hex) Range (X) Conversion Cooling Tower Valve Position 049B % Discharge Refrigerant Temperature 043E- 043F 600-3,630 63,985 = Short 61,425 = Open (X ) / 10 F Evaporator Approach Temperature Evaporator Pump Status 0=Evaporator Pumps Off 1=Starting Evaporator Pump #1 2=Starting Evaporator Pump #2 3=Evaporator Pump #1 On 4=Evaporator Pump #2 On 5=Evaporator Pump #1 Fail; Starting #2 6=Evaporator Pump #2 Fail; Starting #1 7=Evaporator Pumps #1 & #2 Failed Evaporator Pump #1 Operating Hours Evaporator Pump #2 Operating Hours Evaporator Refrigerant Pressure Evaporator Refrigerant Temperature ,630 X / 10 F ,999 hrs 0-49,999 hrs 0-1,500 63,985 = Short 61,425 = Open ,630 63,985 = Short 61,425 = Open X / 10 = (X ) / 10 Units/Descript ion PSIG Evaporator Water Flow Rate ,535 GPM 0451 Evaporator Water Flow Status 0 = No Flow 045E 0, 1 1 = Flow Evaporator Water Rate Sensor 0 = Not Present 1 = Present 083C 0, 1 Evaporator Water Temperature - Delta Evaporator Water Temperature - Entering F 0-2,630 X / 10 F 600-3,630 63,985 = Short 61,425 = Open (X ) / 10 F 9 MicroTech Series 200 Centrifugal Chiller Open Protocol

10 Description Address (Hex) Range (X) Conversion Units/Descript ion Evaporator Water Temperature - Leaving ,630 63,985 = Short 61,425 = Open (X ) / 10 Fault - Current Active 0=None 1C See Below 1=Liquid Line Sensor Failure 2=Entering Evaporator Sensor Failure 3=Leaving Condenser Sensor Failure 4=Low Discharge Super Heat 5=High Discharge Super Heat 6=Entering Evaporator Sensor Problem 7=Outside Air Temperature Sensor Problem 8=High Condenser Pressure No Load 9=High Condenser Pressure Unload 10=Low Evaporator Pressure Unload 11=Condenser Freeze Protect 12=Evaporator Freeze Protect 13=Evaporator Pump 1 Fail 14=Evaporator Pump 2 Fail 15=Condenser Pump 1 Fail 16=Condenser Pump 2 Fail 17=No Pump Down 18=Low Evaporator Pressure Shutdown 19=Low Evaporator No Start 20=Pre Purge Fail 21=Open Solenoid Fail 22=Low Motor Current 23=High Discharge Temperature 24=High Condenser Pressure 25=Mechanical High Condenser Pressure 26=High Motor Temperature 27=Starter Fault 28=No Transition 29=No Evaporator Flow 30=No Condenser Flow 31=High Motor Current 32=No Liquid Run 33=No Super Heat Drop 34=High Discharge Super Heat 35=Evaporator Pressure Sensor Failure 36=Entering Condenser Sensor Failure Shut Down 37=Suction Temperature Sensor Failure 38=Discharge Temperature Sensor Failure 39=Condenser Pressure Sensor Failure 40=Leaving Evaporator Sensor Failure Shut Down 41=Oil Feed Temperature Sensor Failure 42=Oil SumpTemperature Sensor Failure 43=Oil Sump Pressure Sensor Failure 44=Voltage Ratio Sensor Failure Last Start Hour hour Last Start Minute minute Last Start Month month Last Start Date day Last Start Year year Last Stop Hour hour Last Stop Minute minute F MicroTech Series 200 Centrifugal Chiller Open Protocol 10

11 Description Address (Hex) Range (X) Conversion Units/Descript ion Last Stop Month month Last Stop Date day Last Stop Year 086A 0-99 year Liquid Line Refrigerant Temperature 043C- 043D 600-3,630 63,985 = Short 61,425 = Open (X -1000) / 10 F Liquid Line Pressure Evap Temp ,500 63,985 = Short 61,425 = Open 600-3,630 63,985 = Short 61,425 = Open X / 10 (X -1000) / 10 PSIG Condenser Evaporator Ratio 04AC ratio Outdoor Air Temperature Method 083B = Not Present 1 = Local 2 = Network Outdoor Air Temperature X F Local 253=N/A 255= Bad Sen Refrigerant Detection Sensor 0 = Not Present 083E 0, 1 1 = Present Refrigerant Leak Detection Limit 044B PPM F 11 MicroTech Series 200 Centrifugal Chiller Open Protocol

12 Description Address (Hex) Range (X) Conversion Units/Descript ion Unit Status 0=All Systems Off 1=Off: Alarm 2=Off: Ambient Lockout 3=Off: Panel Switch 4=Off: Manual 5=Off: Remote Switch 6=Off: Remote Communications 7=Off: Time Scedule 8=Start Requested 9=Evaporator Pump Off 10=Evaporator Pump On - Recirculate 11=Evaporator Pump On - Cycle Timers 12=Evaporator Pump On - Waiting for Load 13=Evaporator Pump On - Waiting for Flood 14=Condenser Pump Off 15=Condenser Pump On Waiting for Flow 16=Startup Unloading 17=MCR Started 18=MCR On Prepurge 19=MCR On Open Solenoid 20=Running OK 21=MCR Off Rpaid Shutdown 22=Shut Down - Pump Down 23=MCR Off Routine Shutdown 24=Condenser Pump Off Shut Down 25=Evaporator Pump Off Shutdown Read Only Memory Definitions Chilled Water Temperature - Active Setpoint 0905 The chilled water temperature location contains the active chilled water setpoint the unit is using for temperature control. The active setpoint may be set by several control scenarios which are dependent upon chiller configuration parameters. A data range of 0 to 160 corresponds to the temperature range of 0ºF to 80ºF with 0.5ºF resolution. Chiller Unit Temperature Type 084B Unit temperature type indicates whether the unit is a low or standard discharge temperature unit. A value of zero indicates a standard chiller unit; a one indicates a low temperature unit. Communications Signal 040C This value monitors whether communications from the BAS are active or not. A value of one indicates that communications are active. A value of zero indicates that communications have been lost. In most cases this occurs when the Communications Signal 047D has timed out. Once a nonzero value is written to 047D, the Communications Signal should change from zero to one. If this is not the case there is another problem preventing communications. Compressor Lift Pressure 046A-6B Lift pressure is the pressure rise of the refrigerant gas as it passes through the compressor. Lift pressure is calculated by subtracting evaporator refrigerant pressure from the condenser refrigerant pressure. The BAS integrator should assume this value will always be valid. The resolution of the value is 0.1 PSIG. Compressor Motor Current 044C - 4D Motor current holds the number of electrical Amps. being drawn by the compressor motor measured with a 1.0 A resolution. The range for this data is dependent on the size of the motor. The BAS integrator should assume this value will always be valid. MicroTech Series 200 Centrifugal Chiller Open Protocol 12

13 Compressor Motor Current Percent 044A Motor current percent stores the number of electrical Amps. the compressor motor is drawing as a percentage of its Rated Load Amps (RLA). The data represents a valid percentage only if the resultant value is between 0-125% of RLA. The resolution of the value is 1.0%. Compressor Number of Starts 085F-60 Number of starts stores the number of compressor motor starts that have occurred. These locations contain valid data only if the value is between 0 and 49,999. The value will roll over to 0 once the 50,000 start has occurred. Compressor Operating Hours Operating hours stores the number of hours the compressor has run. The data is valid when in the range of 0 and 49,999. The value will roll over to zero (0) once the 49,999 hour has been completed. Compressor Suction Temperature 043A-3B Suction temperature is the temperature of the refrigerant gas entering the compressor. The data represents a valid temperature only if the resultant value is between -40 F and 263 F. The resolution of the value is 0.1 F. Compressor Superheat - Discharge 046E-6F Discharge superheat is the temperature difference between the refrigerant gas leaving the compressor and the refrigerant phase change temperature point. It is derived by subtracting a calculated condenser refrigerant phase change temperature from discharge refrigerant temperature. The data represents a valid temperature only if the resultant value is between 0 F and 263 F. The resolution of the value is 0.1 F. Compressor Superheat - Suction 046C-6D Suction superheat is the temperature difference between the refrigerant gas entering the compressor and the refrigerant phase change temperature point. It is derived by subtracting a calculated evaporator refrigerant phase change temperature from the compressor suction temperature. The data represents a valid temperature only if the resultant value is between 0 F and 263 F. The resolution of the value is 0.1 F. Condenser Approach Temperature The approach temperature is the difference in temperature between the condenser refrigerant and the condenser leaving water. It is calculated by subtracting leaving condenser water temperature from condenser refrigerant temperature. The data represents a valid temperature only if the resultant value is between 0 F and 263 F. The resolution of the value is 0.1 F. Condenser Differential Pressure - Liquid Line This differential pressure is the difference between the condenser and the liquid line in PSI. Condenser Pump Status 0425 Pump status stores the operating status of the condenser water pumps. Condenser Pump #1 Operating Hours 085A-5B Pump #1 operating hours stores the number of hours condenser pump #1 has run. These locations contain valid data when in the range of 0 and 49,999. The value will roll over to 0 once the 49,999 hour has been completed. Condenser Pump #2 Operating Hours 085D-5E Pump #2 operating hours stores the number of hours condenser pump #2 has run. These locations contain valid data when in the range of 0 and 49,999. The value will roll over to 0 once the 49,999 hour has been completed. Condenser Refrigerant Pressure Refrigerant pressure is the pressure of the refrigerant gas in the condenser shell. The data represents a valid pressure only if the resultant value is between 0 and 450 PSIG. The resolution of the value is 0.1 PSIG. 13 MicroTech Series 200 Centrifugal Chiller Open Protocol

14 Condenser Refrigerant Temperature Refrigerant temperature is the temperature of refrigerant gas in the condenser shell. The data represents a valid temperature only if the resultant value is between -40 F and 263 F. The resolution of the value is 0.1 F. Condenser Subcooling Temperature Subcooling is the temperature difference between the liquid refrigerant leaving the condenser and the refrigerant phase change temperature point. It is derived by subtracting the liquid line refrigerant temperature from a calculated condenser refrigerant phase change temperature. The data represents a valid temperature only if the resultant value is between 0 F and 263 F. The resolution of the value is 0.1 F. Condenser Water Flow Rate Water flow rate stores the rate of water flowing through the condenser tubes. The resolution for this value is 1 GPM and the range is dependent on the condenser flow sensor. If a condenser flow rate sensor is present the data will always be valid. Condenser Water Flow Status 045F The value in the condenser water flow status location indicates the position of the condenser water flow switch. A zero indicates no water flow through the condenser; a one indicates water movement. Condenser Water Rate Sensor 083D The value in the condenser water rate sensor location indicates whether a condenser flow rate sensor is connected to the unit. A zero indicates a sensor is not present; a one indicates a sensor is present. Condenser water flow rate data is valid only when this sensor is present. Condenser Water Temperature - Delta The delta temperature is the difference between the entering and leaving condenser water temperatures. The value is calculated by subtracting entering condenser water temperature from leaving condenser water temperature. The data represents a valid temperature only if the resultant value is between 0 F and 263 F. The resolution of the value is 0.1 F. Condenser Water Temperature - Entering Entering water temperature is the temperature of the water entering the condenser. The data represents a valid temperature only if the resultant value is between -40 F and 263 F. The resolution of the value is 0.1 F. Condenser Water Temperature - Leaving Leaving water temperature is the temperature of the water leaving the condenser. The water temperature is measured with a 0.1 F resolution. The data is valid only if the resultant temperature is between -40 F and 263 F. Cooling Tower Control 0926 The value in the cooling tower control location indicates whether cooling tower functions are being controlled by the chiller unit or an external control system. A zero indicates that an external system is being used; a one indicates that the chiller is providing control. Cooling tower data points are only valid when the chiller is in control. Cooling Tower Stage 049A The value in the cooling tower stage location indicates the number of cooling tower stages that are energized. The data is valid only if tower control is provided by the chiller. The valid range is 0 to 6. Cooling Tower Valve Position 049B The valve position location stores the position of the cooling tower valve. The position is measured as a percent of full open and has a 1% resolution. The data is valid only if tower control is provided by the chiller. The valid range is 0-100%. Discharge Refrigerant Temperature 043E-3F Discharge refrigerant temperature is the temperature of the compressor refrigerant gas as it leaves the compressor. The data represents a valid temperature only if the resultant value is between -40 F and 263 F. The resolution of the value is 0.1 F. MicroTech Series 200 Centrifugal Chiller Open Protocol 14

15 Evaporator Approach Temperature The approach temperature is the difference in temperature between the evaporator refrigerant and the evaporator leaving water. It is calculated by subtracting evaporator refrigerant temperature from leaving evaporator water temperature. The data represents a valid temperature only if the resultant value is between 0 F and 263 F. The resolution of the value is 0.1 F. Evaporator Pump Status 0423 Pump status stores the operating status of the evaporator water pumps. Status Value Evaporator Pumps Off 0 Starting Evaporator Pump #1 1 Starting Evaporator Pump #2 2 Evaporator Pump #1 On 3 Evaporator Pump #2 On 4 Evaporator Pump #1 Fail; Starting #2 5 Evaporator Pump #2 Fail; Starting #1 6 Evaporator Pumps #1 & 2 Failed 7 Evaporator Pump #1 Operating Hours Pump #1 operating hours stores the number of hours evaporator pump #1 has run. These locations contain valid data when in the range of 0 and 49,999. The value will roll over to 0 once the 49,999 hour has been completed. Evaporator Pump #2 Operating Hours Pump #2 operating hours stores the number of hours evaporator pump #2 has run. These locations contain valid data when in the range of 0 and 49,999. The value will roll over to 0 once the 49,999 hour has been completed. Evaporator Refrigerant Pressure Refrigerant pressure is the pressure of the refrigerant gas in the evaporator shell. The data represents a valid pressure only if the resultant value is between 0 and 150 PSIG. The resolution of the value is 0.1 PSIG. Evaporator Refrigerant Temperature Refrigerant temperature is the temperature of refrigerant gas in the evaporator shell. The data represents a valid temperature only if the resultant value is between -40 F and 263 F. The resolution of the value is 0.1 F. Evaporator Water Flow Rate Water flow rate stores the rate of water flowing through the evaporator tubes. The resolution for this value is 1 GPM and the range is dependent on the evaporator flow sensor. If an evaporator flow rate sensor is present the data will always be valid. Evaporator Water Flow Status 045E The value in the evaporator water flow status location indicates the position of the evaporator water flow switch. A zero indicates no water flow through the evaporator; a one indicates water movement. Evaporator Water Rate Sensor 083C The value in the evaporator water rate sensor location indicates whether an evaporator flow rate sensor is connected to the unit. A zero indicates a sensor is not present; a one indicates a sensor is present. Evaporator water flow rate is only valid when this sensor is present. 15 MicroTech Series 200 Centrifugal Chiller Open Protocol

16 Evaporator Water Temperature - Delta Water temperature delta is the difference between the entering and leaving evaporator water temperatures. The value is calculated by subtracting evaporator leaving water temperature from entering evaporator water temperature. The data represents a valid temperature only if the resultant value is between 0 F and 263 F. The resolution of the value is 0.1 F. Evaporator Water Temperature - Entering Entering water temperature is the temperature of the water entering the evaporator. The data represents a valid temperature only if the resultant value is between -40 F and 263 F. The resolution of the value is 0.1 F. Evaporator Water Temperature - Leaving Leaving water temperature is the temperature of the water leaving the evaporator. The water temperature is measured with a 0.1 F resolution. These locations contain valid data only if the resultant temperature is between -40 F and 263 F. Fault - Current Active 1C00 The fault location holds the current unit fault. If multiple faults should occur, the most serious fault will be stored in this location. Fault Condition Value No Fault 0 Liquid Line Sensor Failure 1 Entering Evaporator Water Sensor Failure: Warning 2 Leaving Condenser Water Sensor Failure 3 Entering Evaporator Water Sensor Failure: Problem 6 Outside Air Temperature Sensor 7 Hi Condenser Pressure - No Load 8 Hi Condenser Pressure - Unload 9 Low Evaporator Pressure - Unload 10 Condenser Freeze Protection 11 Evaporator Freeze Protection 12 Evaporator Pump #1 Failure 13 Evaporator Pump #2 Failure 14 Condenser Pump #1 Failure 15 Condenser Pump #2 Failure 16 No Pump Down at Startup 17 Low Evaporator Pressure Shutdown 18 Low Evaporator Pressure No Start 19 PrePurge Failure 20 Open Liquid Solenoid Failure 21 Low Compressor Motor Current 22 High Discharge Temperature 23 High Condenser Pressure 24 Mechanical High Condenser Pressure 25 High Compressor Motor Temperature 26 Compressor Motor Starter Fault 27 MicroTech Series 200 Centrifugal Chiller Open Protocol 16

17 Fault Condition Value Compressor Motor 28 No Evaporator Water Flow 29 No Condenser Water Flow 30 High Compressor Motor Current 31 No Liquid Failure 32 No Superheat Drop Off 33 Hi Discharge Superheat Failure 34 Evaporator Pressure Sensor Failure 35 Entering Condenser Water Sensor Failure 36 Suction Temperature Sensor Failure 37 Discharge Temperature Sensor Failure 38 Condenser Pressure Sensor Failure 39 Leaving Evaporator Water Sensor Failure 40 Voltage Ratio Sensor Failure 44 Last Start Hour 0861 The start hour location stores the hour value corresponding to the last time the unit started in military time. Last Start Minute 0862 The start minute location stores the minute value corresponding to the last time the unit started. Last Start Month 0863 The start month location stores the month value corresponding to the last time the unit started. The value 1 corresponds to the month of January. Last Start Date 0864 The start date location stores the date value corresponding to the last time the unit started. The value 1 corresponds to the first day of the month. Last Start Year 0865 The start year location stores the last two digits of the year corresponding to the last time the unit started. Last Stop Hour 0866 The stop hour location stores the hour value corresponding to the last time the unit stopped in military time. Last Stop Minute 0867 The stop minute location stores the minute value corresponding to the last time the unit stopped. Last Stop Month 0868 The stop month location stores the month value corresponding to the last time the unit stopped. The value 1 corresponds to the month of January. Last Stop Date 0869 The stop date location stores the day value corresponding to the last time the unit stopped. The value 1 corresponds to the first day of the month. Last Stop Year 086A The stop year location stores the last two digits of the year corresponding to the last time the unit stopped. 17 MicroTech Series 200 Centrifugal Chiller Open Protocol

18 Liquid Line Refrigerant Temperature 043C-3D Liquid line refrigerant temperature is the temperature of liquid refrigerant leaving the condenser. The data represents a valid temperature only if the resultant value is between -40 F and 263 F. The resolution of the value is 0.1 F. Evaporator Temperature - Delta The Evaporator Temperature Delta is the difference between the evaporator entering and leaving water temperature (typical range is 6 to 16 F.) Condenser Evaporator Ratio 04AC Condenser Evaporator Ratio is the condenser absolute pressure divided by the evaporator absolute pressure used to help define on/off condition of suction injection. Outdoor Air Temperature - Local 0474 The network outdoor air temperature is an 8-bit converted value of the chiller outdoor air temperature. It may be used by the BAS network for control situations that require a single byte outdoor air temperature. The data in this location is valid only if a sensor is present and the Outdoor Air Temperature Method is set to Local. The valid range of this value is -40 F to 152 F with a 1.0 F resolution. Refrigerant Detection Sensor 083E The value in refrigerant detection sensor location indicates whether the unit has a refrigerant leak detection sensor connected to the unit. A zero indicates a sensor is not present; a one indicates a sensor is present. Refrigerant leak detection limit is only valid when a sensor is present. Refrigerant Leak Detection Limit 044B The value in the refrigerant leak detection location is the parts per million (PPM) value of refrigerant particles detected by the refrigerant leak detection sensor. If a sensor is present, the valid data range is 0 to 100 which corresponds to 0 to 100 PPM. Unit Status 0420 Unit status is the current unit status of the chiller. The following is a list of possible states and their corresponding number. State Name Value Off: All Systems 0 Off: Alarm 1 Off: Ambient Temperature Lockout 2 Off: Panel Rocker Switch 3 Off: Manual 4 Off: Remote Switch 5 Off: Remote Communications 6 Off: Time Schedule 7 Start Requested 8 Evaporator Pump Off 9 Evaporator Pump On - Recirculation 10 Evaporator Pump On - Cycle Timer 11 Evaporator Pump On - Waiting for Load 12 Evaporator Pump On - Waiting for Flood 13 Condenser Pump Off 14 Condenser Pump On - Waiting for Flow 15 Compressor Motor - Start Up Unloading 16 Compressor Motor - Started 17 Compressor Motor - PrePurge 18 MicroTech Series 200 Centrifugal Chiller Open Protocol 18

19 State Name Value Compressor Motor - Open Solenoid 19 Compressor Motor - Running OK 20 Compressor Motor - Rapid Shutdown 21 Compressor Motor - Shut Down Unloading 22 Compressor Motor - Off Normal Shut Down 23 Condenser Pump - Off /Shut Down 24 Evaporator Pump - Off/Shut Down 25 Read and Write Memory Location Table Description Address Range (X) Units/Description Capacity Limit Percent % Clear Current Fault 041E = No Action 1 = Clear Fault Chiller Operation Mode , 2, 3 0 = Stop 2 = Recirculate 3 = Run Chilled Water Temperature Setpoint X / 2 = F Communications Signal 047D = No Comm. Other = Comm. Outdoor Air Temperature - BAS = N/A 255= Bad Sen. X = F Outdoor Air Temperature Method 083B = Not Present 1 = Local 2 = Network Read and Write Memory Definitions Never write to this memory location without investigating and correcting the cause Capacity Limit Percent 0475 The capacity limit percent location is used to define the upper limit for unit cooling capacity. The normal value for this location is 100%, which enables maximum cooling. The unit s ability to cool may be reduced by setting the limit to less than maximum. The limit value is a percentage of full capacity. The valid range for this location is 0-100%. Clear Current Fault The clear current fault location is used to clear the current active fault and re-initialize the unit controller. Writing a one to this location initiates this action. Once the fault has been cleared the controller will set this location back to zero. 041E Chiller Operation Mode 0477 The value in the chiller operation mode location is set to indicate the desired chiller operating mode. There are three possible values. Zero indicates "Stop"; the compressor and water pumps will turn off and all valves will close. A two indicates "Recirculate"; the pumps will start and the valves will open to allow water to circulate through the system. However, the compressor will not start. A three indicates "Run"; the compressor and pumps will start and the valves will modulate as required. (The value one is not applicable to Open Protocol applications and should not be used.) 19 MicroTech Series 200 Centrifugal Chiller Open Protocol

20 Chilled Water Temperature Setpoint 0476 The chilled water temperature setpoint holds the temperature the leaving evaporator water will be cooled to if the unit is using this value for control. The data range of 0 to 160 corresponds to the temperature range of 0ºF to 80ºF with 0.5ºF resolution. The setpoint should not be set below 40ºF for standard temperature chiller units and may be set to 0 F for low temperature units. See: Chilled Water Temperature - Active Setpoint and Chiller Unit Temperature Type on page 12. Communications Signal 047D The communications signal location is used to indicate active network communications between the BAS network and the chiller unit. A non-zero value should be written to this location once every 60 seconds. If this location has not updated for five minutes, the chiller will assume there has been a loss of network communications and revert to internal setpoints for unit control. Outdoor Air Temperature - BAS 0473 The BAS outdoor air temperature location holds the value of the outdoor air temperature provided by the BAS network. The BAS network should write an 8-bit outdoor air temperature to this location. The valid range for this value is , which corresponds to -40ºF to 152ºF. The Outdoor Air Temperature Method must be set for Network for this value to take effect. Outdoor Air Temperature Method 083B The OaT method location indicates the method by which the chiller is receiving the outdoor air temperature value. A zero represents None and indicates no OaT value is used. A one represents Local and indicates that the temperature is supplied by a sensor connected to the chiller. A two represents Network and indicates that the temperature is being provided by the BAS network. MicroTech Series 200 Centrifugal Chiller Open Protocol 20

21 Lead/Lag Load Balance Operation Overview The Series-200 flooded screw chiller is very similar to the Series-200 centrifugal chiller application in that the lead/lag load balance function has been incorporated into the unit controller. Two screw chillers may or may not be set up in the lead/lag load balance configuration, although in most cases in the field, two units will be configured for this option. Please contact the local McQuay Representative for job specific information. In cases where the lead/lag function is used, the use of an open protocol master panel (OPM) is not required. In this case the two controllers will be set up as Master/Slave. One unit will typically be a level 2 unit (master) and the other unit will be a level 3 unit (slave). In cases where the lead/lag function is not used, both units will be configured for level 2 and the use of an OPM is required. Read Only Memory Locations Point Name Address Range Description Lead/Lag Status = Lead and lag are off 1 = Lead on/lag off 2 = Lag on/lead off 3 = Lead and lag are on Lead Unit , 1 0 = Master 1 = Slave Lead Unit Status Same as Unit Status (0420) Lag Unit Status Same as Unit Status (0420) Lead Motor Current % Lag Motor Current % Lead Status , 1 0 = Lead disabled 1 = Lead enabled Lag Status , 1 0 = Lag disabled 1 = Lag enabled Lead/Lag Status 0401 This memory address indicates which units are running and which units are not running. Lead Unit 0402 This memory address indicates whether the lead unit is currently the Master unit or the Slave unit. Lead Unit Status 0403 This memory address gives the unit address for the lead unit. Please refer to the read only point Unit Status 0420 for a table listing of values and their corresponding meanings. Lag Unit Status 0404 This memory address gives the unit address for the lag unit. Please refer to the read only point Unit Status 0420 for a table listing of values and their corresponding meanings. Lead Motor Current 0405 Current drawn by lead unit as a percentage of its rated load amps (RLA). Lag Motor Current 0406 Current drawn by lag unit as a percentage of its rated load amps (RLA). 21 MicroTech Series 200 Centrifugal Chiller Open Protocol

22 Lead Status 0407 This memory address indicates whether the lead unit is enabled for operation or disabled. Lag Status 0408 This memory address indicates whether the lag unit is enabled for operation or disabled. Read/Write Memory Locations Point Name Address Range (X) Units/Description Master/Slave Setpoint 093C 0, 1 0 = Master 1 = Slave (Default) Lead/Lag Mode Setpoint 093D = Master is always Lead 1 = Slave is always Lead 2 = Auto-select (Default) Enable Lag Setpoint 093E % (Default = 95) Disable Lag Setpoint 093F % (Default = 40) Lag Standby Setpoint , 1 0 = No (Default) 1 = Yes Lead/Lag Switch Setpoint (Day) Lead/Lag Switch Setpoint (Hour) = N/A (Default) 1 = Sunday 2 = Monday 3 = Tuesday 4 = Wednesday 5 = Thursday 6 = Friday 7 = Saturday (default = 0) Hour (Default = 0) i.e 22 = 10 p.m. Master/Slave Setpoint 093C This memory address identifies a unit as either the Master or the Slave, for lead/lag purposes. The Master controls the lead/lag processing. Note: This memory location should only be written to for development of an interface for these units. It should not be written to in the field. McQuay will have provided all required setup for units prior to BAS tying into unit/network. Lead/Lag Mode Setpoint 093D This memory address controls the selection of the Lead unit. If Auto-select is chosen, the unit with the least run hours will become the lead unit after any time the units are both shut down. Enable Lag Setpoint 093E If the Lead unit is running alone and its motor current exceeds this percentage of its RLA, the interstage timer will begin to run. When it expires, the Lag unit will turn on (unless the Lag unit has been designated as standby). Disable Lag Setpoint 093F If both the Lead and Lag units are running and the motor current of either drops below this percentage of its RLA, the interstage timer will begin to run. When it expires, the Lag unit will shut off. Lag Standby Setpoint 0942 This memory address determines whether the Lag unit is to be used as a standby only. MicroTech Series 200 Centrifugal Chiller Open Protocol 22

23 Lead/Lag Switch Setpoint (Day) 0948 This memory address contains the day on which the Master should auto-select the Lead unit. Lead/Lag Mode Setpoint must be set to auto-select for this to take effect. Lead/Lag Switch Setpoint (Hour) 0949 This memory address contains the hour at which the Master should auto-select the Lead unit. Lead/Lag Mode Setpoint must be set to auto-select for this to take effect. 23 MicroTech Series 200 Centrifugal Chiller Open Protocol

24 Series-200 Flooded Screw Chiller Simulator Package Purpose Development Tools McQuay International offers hardware and software that will assist in the development of an open protocol interface. These tools will allow the designer to set up a simulated unit, read information from one communications port using McQuay Windows Monitor Simulation Software, and compare information from the BAS open protocol interface from a second communications port. If the BAS interface is working properly, the information read from the Windows Simulation Software will be identical to the information read by the BAS interface. McQuay International offers the following tools to facilitate the development and testing of an Open Protocol interface for Series-200 flooded screw chillers. Literature: Monitor Installation Hardware Configuration McQuay "Open Protocol Data Communications - Data Packet Protocol" document (version 1.0 dated February or latest update). Hardware required: McQuay offers the following hardware for development: Model 250 controller(s) Model 120 RS-232 Communications Cable package RS-485 Communication Cable package McQuay Open Protocol Monitor and Simulator software for Series-200 flooded screw chillers. The Microsoft Windows environment is required to run the McQuay Open Protocol Simulator Monitor software. Monitor software is currently available for download on McQuay On-line. The software is packaged in a self-extracting file which when executed, will install the software on your system. The desired hardware configuration for proving out an Open Protocol interface is shown below. In this arrangement, the Open Protocol interface to the BAS (Building Automation System) communications device is operational on the controller's Port A, and the McQuay Monitor program is running on a PC connected to the controller's Port B. MicroTech Series 200 Centrifugal Chiller Open Protocol 24

25 Testing Confirm that each data point that has been set up within the BAS interface is properly interpreted and displayed. This is done by comparing the BAS system values with the values displayed by the McQuay Monitor software. When checking a variable (by using the Support - Read/Write menu option or by clicking on the variable and using the "Change Value" dialog box), it is useful to test its high and low limits as well as values within its normal working range. For example, if a temperature is valid between F and 180 F, change the variable to -40 F and then 180 F. The chiller simulator control code and the Monitor program allow both read only and read/write variables to be modified to facilitate this kind of testing. 25 MicroTech Series 200 Centrifugal Chiller Open Protocol

26 Simulator Monitor Software Guide Logging on to the software If you have an old copy of the monitor software that has not been updated yet and a password is required and you can not get into the software, please contact McQuay International Controls and Network Systems Marketing group on McQuay On-line. The current contact is Amato.Cliff. Simulator Monitor software released after January 1, 1997 will have a username: MCQUAY password: PARTNER. Communications Initialization After logging in you will be asked to initiate communications If you are connecting to a simulator controller you will want to select YES. If you are successful at connecting you will be at the main screen. If you are unsuccessful you will see the following: MicroTech Series 200 Centrifugal Chiller Open Protocol 26

27 If you see this screen you may have a communications setup problem. You may select the Change Setup function to change communications parameters. You will come to a screen that looks like: The problem is most likely you are using the wrong comm port on your PC. Check to make sure you are using either Comm 1 or Comm 2. The password for the controller will most likely be the default shown (FFFFFFFF). If for some reason your simulator has a different password, you may enter a new password here to try and establish communications to the controller. Note that this password does not change the controller password, it merely tries to match one of the four level passwords that exist in the controller. The connection type needs to be DIRECT, however the BAUD RATE does not need to match the baud rate that the controller port is set up for. When direct connecting to a controller the monitor software will test all possible connection speeds from 300 to 9600 Baud until a connection is made or all baud rates have been attempted. Once you have adjusted the above parameters, you may attempt to connect to the controller once again by pressing the Init Comm button. Downloading Simulation code Once you have connected to the controller you may need to download simulator application code. From the Main Menu bar select the Support option. Under the menu items for support you will find Download. Select Download and you should see the following screen: 27 MicroTech Series 200 Centrifugal Chiller Open Protocol

28 The controller address should be 00.ff in the case of a single unit connection. 00.ff is a special address which tells the software to connect to the direct connected controller regardless of the controller s address setting. Alternately, you may enter the address of the controller, however when trying to connect in this manner, the address must match. The Save Data, Download Program, Restore Data option should be chosen for every download. The program file will be the simulator code you wish to download to the controller. The data file is a temporary file in which will be stored controller data during the download process. This file may be deleted off of your hard drive after successful download. You must specify a data file name but the name of the file is arbitrary. The save options you should have checked are Port Configuration and Passwords. You should see the download progress dialog box after initiating the download: Monitoring a simulator controller Once the code is properly downloaded into the simulator controller, you may begin to monitor memory locations in the Windows Simulator Monitor Software. From the Main Menu, choose Screen, and select Monitor Unit. Double-click the appropriate screen to start seeing simulator data. MicroTech Series 200 Centrifugal Chiller Open Protocol 28

29 Read/Write screens You may want to use the read/write screen in conjunction with the monitor screens to double check the raw data values coming back from the controller. The following screen is an example of how to use the read/write screen for comparison. The Monitor Screen option has been selected and the read/write option has also been selected (from the main menu, support option). The above memory location for Chilled Water Temperature displays 44 degrees F. In the read/write screen you can see the decimal value of memory location $0905 which is 88. The conversion in this case is value/2 to get degrees F. 29 MicroTech Series 200 Centrifugal Chiller Open Protocol

30 Further Information on Windows Monitor Software This document should get you started using Windows Monitor. You should not have to use any of the other functions of Windows Monitor in order to test your interface. If further information on Windows Monitor is required, please refer to McQuay International MicroTech Monitor 1.0 for Windows User s Manual. MicroTech Series 200 Centrifugal Chiller Open Protocol 30

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