VTI MODEL itc5000 HEAT TRACING CONTROL SYSTEM OPERATIONS MANUAL

Transcription

1 VTI MODEL itc5000 HEAT TRACING CONTROL SYSTEM OPERATIONS MANUAL 1

2 Operations Manual for the VTI Model itc5000 Heat Tracing Control System Description The VTI Model itc5000 Heat Tracing Control System consists of an itc5000 Scanning Controller which uses state-of-the-art electronics to control up to 42 Square D Powerlink G3 Motor Operated branch circuit breakers. The system is available for systems voltages as shown in Table 1 for 60 or 50 Hertz applications with Square D NF panelboards. The system also includes current monitoring modules which mount outboard of the Powerlink breakers to provide heater current, as well as, ground fault current monitoring for each heater zone. The system enclosures are available with or without the power transformer in ratings of 15KVA through 75KVA. Heater Circuit Operating Voltage Transformer Delta Primary * Transformer Wye Secondary 120 Volt 480 Volt 208/120 Volt 240 Volt 480 Volt 415/240 Volt 277 Volt 480 Volt 480/277 Volt 240 Volt, 50 Hertz 415 Volt 415/240 Volt * Transformers are available with a 600 Volt Primary. itc5000 SCANNING CONTROLLER Table 1: Systems Voltages The itc5000 Scanning Controller can be configured to operate in several functional modes, depending on the configuration to be implemented. However, the overall breaker control functions, displays, and pushbutton controls are identical for each configuration. Control Configurations The itc5000 Scanning Controller is available in four basic configurations to provide the widest range of temperature control solutions. These configurations are described below: 1. Control Configuration from a DCS or PLC System. 2. Common Temperature Control Configuration. (For example: typical freeze protection applications) onboard single RTD input, or remote contact switch input 3. Individual RTD Feedback Temperature Control. 4. Extension of configuration 3 above for applications having both freeze protection and process heating requirements. 2

3 1. MODBUS CONTROL CONFIGURATION In the Control Configuration the temperature control is provided by a DCS System or PLC (Programmable Logic Controller) which monitors the temperature of each zone. The temperature feedback can be provided by the itc5000 Scanning Controller via query. The DCS System determines when to apply power to the heater based on its control loop algorithm. If the heater zone is to be energized, a signal is sent via to the itc5000 Scanning Controller which directs the command to the appropriate circuit breaker to be switched ON. Once the circuit breaker is switched ON, the load current and the GFI current are monitored by the itc5000 Scanning Controller to verify that the currents are within the preset limits. If not, the circuit breaker is switched OFF and an alarm is initiated. In this mode the itc5000 Scanning Controller acts as a slave device and can be queried to report the status and condition of each zone. 2. COMMON TEMPERATURE CONTROL CONFIGURATION In the Common Temperature Control Configuration the temperature control feedback is provided by a thermostat or by an ambient sensing RTD Temperature Sensor input located on the itc5000 Scanning Controller printed circuit board. As the temperature falls below the setpoint, a contact closure of the thermostat or a feedback from RTD input activates the itc5000 Scanning Controller to switch all circuit breakers in the Powerlink panel to the ON position. Once the circuit breaker is switched ON, the load current and the GFI current are monitored by the itc5000 Scanning Controller to verify that the currents are within preset limits. If not, the circuit breaker is switched OFF and an alarm is initiated. For this option, field terminals will be supplied for one 3-lead RTD input or a thermostat contact input. A 30 second time delay is utilized for the thermostat switch input to prevent circuit breaker switching caused by contact chatter. Note: In this configuration, the communication is active and the itc5000 Scanning Controller acts as a Slave device, and can be queried by any Master device to report the status and condition of each zone. 3. RTD FEDDBACK TEMPERATURE CONTROL CONFIGURATION In the RTD Feedback Temperature Control Configuration the itc5000 Scanning Controller utilizes temperature feedback from individual RTD sensors from each zone. The temperature of each zone is compared to the temperature setpoint for that zone and the itc5000 Scanning Controller determines if the heating circuit should be energized based on the actual zone temperature, temperature setpoint, and deadband for that zone. If heat is required, the breaker for that zone is switched ON. Once the circuit breaker is switched ON, the load current and the GFI current are monitored by the itc5000 Scanning Controller to verify that the currents are within preset limits. If not, the circuit breaker is switched OFF and an alarm is initiated. The 3-lead RTD input circuitry, with field terminals, is supplied as a separate PC Board connected to the itc5000 Scanning Controller. These parts will be supplied only if the RTD option is selected. Note: In this configuration, the communication is active and the itc5000 Scanning Controller acts as a Slave device, and can be queried by any Master device to report the status and condition of each zone. 3

4 4. THE COMBINATION OF AMBIENT SENSING FREEZE PROTECTION AND INDIVIDUALLY CONTROLLED PROCESS HEATING CIRCUITS This configuration feature may be used only when the separate RTD Input PC Board is used as described in Section 3 above. The number of RTD sensors does not have to be the same as the number of heating zones; some zones can be controlled by RTD Zone-Linking. Zone-Linking means that one RTD can be assigned to several zones. This makes it possible to combine freeze protection circuits and individual process heating circuits within the same control system. Each process heating circuit will have an individual RTD while the freeze protection heating circuits can all be programmed to control from one RTD that is used for monitoring the ambient temperature. Note: In this configuration, the communication is active and the itc5000 Scanning Controller acts as a Slave device, and can be queried by any Master device to report the status and condition of each zone. Control Panel Display s Figure 1: Display Arrangement The five Alphanumeric Display s are listed in Table 2. DESIGNATION FUNCTION ZONE 2 Digits - Displays zone number being monitored or programmed TEMPERATURE 4 Digits - Displays process temperature in degrees C or F (also displays parameter selected during programming) CURRENT 3 Digits - Displays heater current in Amps (also displays selected parameter value during programming) GFI (ma) / SETPOINT 3 Digits - Displays heater leakage current or Zone s Setpoint ALARM 2 Digits - Displays an alarm code corresponding to type of alarm Table 2: Alphanumeric Display s The Pushbutton Control s are listed in Table 3. 4

5 DESIGNATION SCAN/STOP ENTER/EXIT TEST ZONE PREV NEXT UP DOWN RESET/CANCEL FUNCTION Starts/Stops the sequential channel scanning display Enters/Exits the programming mode or Enters a new value Tests selected zone Accesses previous zone/parameter Accesses next zone/parameter Increments value of selected parameter Decrements value of selected parameter Acknowledges and Clears alarm or Returns old parameter value Table 3: Pushbutton Control s The LED Indicator s are listed in Table 4. DESIGNATION Heat On Alarm (flash) Alarm (solid) Run Mode Programming Mode (flash) Programming Mode (solid) C F FUNCTION Indicates that power is applied to the currently displayed zone Indicates that an alarm condition is present on one or more channels Indicates that an alarm is present, but acknowledged Indicates that the controller is in display scanning mode Indicates that the parameter value has been changed Indicates that the controller is in the programming mode Indicates that the temperature is displayed in degrees C Indicates that the temperature is displayed in degrees F Table 4: LED Indicator s itc5000 SCANNING CONTROLLER PROGRAMMING To simplify setup, a global mode setup is employed in the programming mode. The global mode setup will overwrite the programmed parameter value for all zones, although subsequent setup for individual zone will overwrite the value again. A good practice is to start with the global mode setup and then go to the individual zone to fine tune the settings. Programming Sequence for Global Mode Setup The operating parameters for all zones are programmed using this procedure. {Note: The Bold command in the following instructions indicates the active function for dual function pushbuttons.} 1. Press SCAN/STOP pushbutton to stop the display scan. The display stops and the currently selected zone number is shown in the ZONE display. Notice that the Run Mode LED indicator goes OFF indicating that the itc5000 Scanning Controller is in the stop display mode. The itc5000 Scanning Controller continues to run and controls to the last programmed input. 2. Press the UP pushbutton to program the global settings. The ZONE display will show GL for global. Notice that the Programming Mode LED goes ON, the setup parameters name from Table 5 appears in the TEMPERATURE display window, and its value appears in the CURRENT display window. 3. Press NEXT and PREV pushbutton for accessing the next or previous setup parameter. The global parameter names are shown sequentially in Table 5. 5

6 4. Change the desired parameter value by using the UP or DOWN pushbutton. The new parameter will change one integer with each momentary push of the UP or DOWN pushbutton. The parameter will ramp up or down if you hold in the pushbutton. Notice that the Programming Mode LED flashes indicating that the value has been changed during this process. 5. Press ENTER/EXIT pushbutton to enter the value. The display blinks to indicate that the value has been saved and the Programming Mode LED stops flashing. The new value will be used immediately by the itc5000 Scanning Controller. 6. If you change your mind and want to return to the original value, press RESET/CANCEL pushbutton before pressing the ENTER/EXIT pushbutton. The original value will be returned and the Programming Mode LED stops flashing to indicate that the changed value is cancelled. 7. Press NEXT or PREV pushbutton to access another parameter to program or press the ENTER/EXIT pushbutton to exit from the programming mode. Notice that the Programming Mode LED goes OFF after the ENTER/EXIT pushbutton is depressed. 8. In the alarm setting mode, pressing the NEXT pushbutton swaps the alarm limit value and its mode to indicate that the currently selected alarm can be enabled or disabled. Press the UP or DOWN pushbutton to enable or disable the alarm. Press ENTER/EXIT pushbutton to enter the selection. 9. Press SCAN/STOP pushbutton to resume the display scan. Notice that the Run Mode LED is now lit after the SCAN/STOP pushbutton is depressed. DESIGNATOR TFB SP DB LT HT LC HC IDLY GFI CB RTD BAUD PRTY SBIT ADDR REV DESCRIPTION Global temperature feedback (MBUS), Ambient Sensing RTD (ARTD), switch contact input (SWCH) or individual RTDs (RTD) Temperature Setpoint Temperature Dead Band (in ± degrees from setpoint) Temperature Alarm Setpoint Temperature Alarm Setpoint Current Alarm Setpoint (in Amp) Current Alarm Setpoint (in Amp) Inrush Current Delay (in minutes) Ground Fault Current Setpoint (in ma) Set Circuit Breaker operation to Manual/Auto Enable/Disable RTD sensor failure alarm Communication baudrate Communication Parity (Even, Odd, and None) Communication Stopbit (1 or 2 bits, always 1 bit for even or odd parity) address Software Revision (cannot be changed) Table 5: Global Setup Parameters Note: To disable unused zones programmed in the global mode setup, go to the individual zone programming sequence below. 6

7 Programming Sequence for Programming Individual Zones The following procedure is used to program individual zones. {Note: The Bold command in the following instructions indicates the active function for dual function pushbuttons.} 1. Press SCAN/STOP pushbutton to stop the display scan. The display stops and the currently selected zone number is displayed in the ZONE display. Notice that the Run Mode LED indicator goes OFF indicating that the itc5000 Scanning Controller is in the stop display mode. The itc5000 Scanning Controller continues to run and controls to the last programmed input. 2. Press NEXT or PREV pushbutton for selecting the zones. Press NEXT or PREV pushbutton for accessing the next or previous setup parameter. The individual zone parameter names are shown sequentially in Table Press ENTER/EXIT pushbutton to enter programming mode. Notice that the Programming Mode LED goes ON, the setup parameters name from Table 6 appears in the TEMPERATURE display window, and its value appears in the CURRENT display window. 4. Press NEXT or PREV pushbutton for accessing the next or previous setup parameter. The parameter names are shown sequentially as shown in Table Change the desired parameter value by using the UP or DOWN pushbutton. The new parameter will change one integer with each momentary push of the UP or DOWN pushbutton. The parameter will ramp up or down if you hold in button. Notice that the Programming Mode LED flashes indicating that the value has been changed during this process. 6. Press ENTER/EXIT pushbutton to enter the value. The display blinks to indicate that the value has been saved and the Programming Mode LED stops flashing. The new value will be used immediately by the VTI itc5000 Scanning Controller. 7. If you change your mind and want to return to the original value, press RESET/CANCEL pushbutton before pressing the ENTER/EXIT pushbutton. The original value will be returned and the Programming Mode LED stops flashing to indicate that the changed value is cancelled. 8. Press NEXT or PREV pushbutton to access another parameter to program or press the ENTER/EXIT pushbutton to exit from the programming mode. Notice that the Programming Mode LED goes OFF after the ENTER/EXIT pushbutton is depressed. 9. In the alarm setting mode, pressing the NEXT pushbutton swaps the alarm limit value and its mode to indicate that the currently selected alarm can be enabled or disabled. Press the UP or DOWN pushbutton to enable or disable the alarm. Press ENTER/EXIT pushbutton to enter the selection. 10. Press NEXT or PREV pushbutton to access another zone to program or press SCAN/STOP pushbutton to resume the display scan. Notice that the Run Mode LED is now lit after the SCAN/STOP pushbutton is depressed. 7

8 DESIGNATOR ZONE RTFB TFB SP DB LT HT LC HC IDLY GFI CB RTD DESCRIPTION Enable/Disable Zone Displayed when temperature feedback is from individual zone RTD for zone number RTD assignment; Displayed when temperature feedback is from ambient RTD (ARTD), switch contact input (SWCH), or (MBUS) Temperature Setpoint Temperature Dead Band (in ± degrees from setpoint) Temperature Alarm Setpoint Temperature Alarm Setpoint Current Alarm Setpoint (in Amp) Current Alarm Setpoint (in Amp) Inrush Current Delay (in minutes) Ground Fault Current Setpoint (in ma) Set Circuit Breaker operation to Manual/Auto Enable/Disable RTD sensor failure alarm Table 6: Individual Zone Setup Parameters Note: During the programming sequence, the controller continuously scans all channels and reports if there are any problems. Only the display is stopped from scanning. Optional Display Parameters The default display parameters is preset from the factory to display the ground leakage current (GFI) in the GFI/SETPOINT window. If you desire to display the setpoint or see what the setpoint is, then follow the steps below: 1. Press the SCAN/STOP pushbutton. This stops the display scanner only. 2. Press and hold the DOWN pushbutton for 5 seconds. The display will switch from the GFI display to the setpoint. This action will change the display for all zones and will continue to be displayed until it is changed again. If the DOWN pushbutton is pressed and held again the display will switch back to the GFI display. 3. Press the SCAN/STOP pushbutton to restart the display scanning. 8

9 ALARMS When an alarm condition is detected, the itc5000 Scanning Controller display stops and displays the zone in the alarm condition. If there is more than one zone in the alarm condition, each zone in the alarm condition will be displayed sequentially. Once a zone or zones go into an alarm condition, the alarm relay is energized, the Alarm LED begins flashing, and the ALARM display shows the type of alarm as shown in Table 7. If there is more than one type of alarms, the alarm display will show them sequentially. Note: During the process of displaying the alarms, the internal scanning controller continues to scan and control to the programmed values for each of the other zones. To acknowledge an alarm press RESET/CANCEL pushbuttons. This will resume the display scan, and deenergize the alarm relay. The alarm type will be displayed, when the corresponding zone is displayed during display scan. Notice: The Alarm LED will stop flashing to indicate that the alarm has been acknowledged, and stays on until the alarm or alarms have been cleared. If the alarm has not been cleared after 8 hours, it will be re-initiated, and treated as a new alarm. If new alarm occurs when previous alarm has been acknowledged, all alarms are treated as new. DESIGNATOR DESCRIPTION RESET BREAKER ACTION STATUS HT Temperature Alarm Auto Off LT Temperature Alarm Auto On HC Current Alarm Manual Off LC Current Alarm Auto On GF Ground Fault Alarm Manual Off RT RTD Sensor Failure Alarm Manual Off BF Circuit Breaker Failure Alarm Manual Fault WD Watch dog alarm Manual Normal Table 7 Alarm types Note: the above reset action and breaker status are fixed and cannot be changed. The user can only enable or disable the alarms. When an alarm is active or acknowledged, pressing SCAN/STOP pushbutton to stop the display will display the first alarmed zone, and pressing NEXT or PREV pushbutton will cycle through all alarmed zones. To return to a normal display behavior, press RESET pushbutton after acknowledging the alarm. To prevent the itc5000 Scanning Controller software from crashing or going into an endless loop, an external watchdog has been implemented. The itc5000 Scanning Controller software has to RESET the watchdog regularly. In the event that the software crashes or goes into an endless loop, the watchdog will not be RESET and it will reset the microprocessor to restart the software. Upon successful restart, the software will detect the event and energizes the alarm relay, flashes the alarm LED, and display WD alarm type. If for some reasons the microprocessor dies, the watchdog will still try to reset the microprocessor but it will also energize the alarm, blank the display, and flash the alarm LED at the rate of about 1.5 second intervals. During this period the branch circuit breakers will temporarily remain in the same position as before the microprocessor failure. After 10 minutes all branch circuit breakers will be switched to the ON position and remain in that position until they are switched manually. A Failsafe Alarm feature is also implemented to ensure that a power loss condition to the itc5000 Scanning Controller will indicate an alarm. The failsafe alarm feature can be selected or omitted by means of a jumper on the itc5000 Scanning Controller printed circuit board. To make the Failsafe Alarm selection put the 9

10 jumper on the FS side of the header. The header is located in the vicinity of alarm relay output terminal. When the Failsafe Alarm is selected, the alarm relay is in an energized state during normal operation. All operational alarm will be detected normally by itc5000 Scanning Controller, and will be indicated by deenergizing the alarm relay. A power loss condition will also de-energize the alarm relay which indicates an alarm condition. When the Failsafe Alarm is not selected, all operational alarms will still be detected normally by itc5000 Scanning Controller, and will be indicated by energizing the alarm relay. On the other hand, a power loss condition cannot be indicated, since the alarm relay cannot be energized due to the power loss. The Failsafe Alarm is selected as the factory default. The alarm relay output contact is one form C contact (NO/NC). Note that the NO/NC labels on the printed circuit board indicate the contact in a deenergized state. itc5000 SCANNING CONTROLLER OPERATION To troubleshoot a particular zone, a TEST ZONE pushbutton is implemented to test the currently displayed zone. This pushbutton is active only in itc5000 Scanning Controller stop display mode. Press SCAN/STOP pushbutton to stop the display scan, and press TEST ZONE pushbutton to change the state of the circuit breaker. During test, all other pushbuttons are disabled, and the Run Mode LED flashes to indicate that the itc5000 Scanning Controller is in test mode. Press TEST ZONE pushbutton again to exit the test mode, and press SCAN/STOP pushbutton to resume the display scan. Should an alarm occur during test, the itc5000 Scanning Controller will immediately exit the test mode, and indicate an alarm condition. A self test feature is also implemented to make sure that the heating circuit is in working condition when needed. The itc5000 Scanning Controller keeps track of when a breaker was last turned off. After a breaker is in the off state for 24 hours, the itc5000 Scanning Controller will turn it on for the length of Inrush Current Delay plus 1 minute, and any alarm condition during self test will be indicated by the alarm display and the alarm relay state. A Current (LC) alarm will be kept even if the self-test has finished to inform the operator that a heating zone is potentially open. During the period a zone is under self-test, its Heat On LED flashes to indicate that the zone is undergoing a self-test. A combination of a flashing Heat On LED and an alarm condition indicates that that particular zone failed during its self-test cycle. The operational life of a branch circuit breaker is 200,000 cycles at 80% load and 0.8 Power Factor. Packaging The VTI itc5000 Heat Tracing Control System is packaged in a motor control center cabinet similar to a VTI Unitized Distribution Substation (UDS) approximately 90 high by 34 wide by 20 deep and available with a 15KVA, 30KVA, 45KVA, or 75KVA transformers. The Powerlink panelboard and circuit breakers are mounted in the top compartment along with a pair of current monitoring modules and load terminal blocks. The itc5000 Scanning Controller is mounted in an isolated compartment on the left hand side of the center section while the Secondary Main Circuit Breaker is mounted in an insolated compartment on the right hand side of the center section. An optional Primary Disconnect or Primary Circuit Breaker is mounted in an isolated compartment to the left of the itc5000 Scanning Controller. The power transformer is mounted in the bottom compartment and is vented to the top via a rear chimney. 10

11 VTI itc5000 HEAT TRACING CONTROL SPECIFICATIONS NEMA 1 CABINET SIZE: 90 H x 34 W x 20 D TRANSFORMER SIZES: Three Phase 15KVA, 30KVA, 45KVA or 50 or 60 HZ PRIMARY VOLTAGE: Three Phase 600 VAC, 480 VAC or or 60 HZ SECONDARY VOLTAGE: Three Phase 208Y120 VAC, 480Y277 VAC or 415Y240 VAC SECONDARY PROTECTIVE DEVICE: Main Circuit Breaker available through 75KVA PANELBOARD: Square-D NF Panelboard CIRCUIT BREAKERS: Available in 15, 20, and 30 Ampere ratings SCANNING CONTROLLER: 42 Heater Circuits 30 Heater Circuits 24 Heater Circuits OPERATIONAL DISPLAYS: ZONE 1 through maximum number of circuits TEMPERATURE 0 C C (32 F F) CURRENT 0 through 30 Amps GFI 0 through 100 Milliamps SETPOINT 0 C C (32 F F) CONTROL PUSHBUTTON: SCAN/STOP Start or Stop display scan ENTER/EXIT Enter / Exit programming mode or enter new value TEST ZONE Initiate testing of zone PREV Go to previous zone/parameter NEXT Go to next zone/parameter DOWN Decrement parameter UP Increment parameter RESET/CANCEL Reset alarm or Restore original parameter value during programming ALARM DISPLAYS: HT Temperature LT Temperature HC Current LC Current GF Ground Fault Current RT RTD Sensor Failure BF Breaker Fail (tripped or in wrong position) WD Watchdog Timer LED INDICATORS: 11

12 Heat On Indicates that power is applied to the currently displayed heater zone Alarm Indicates that an alarm condition has been detected Run Mode Indicates controller is in running mode Programming Mode Indicates controller is in programming mode C Temperature is displayed in degrees C F Temperature is displayed in degrees F COMMUNICATION: 9600 baud and baud RTU with standard 1 unit-load RS-485 device 12

13 Figure 2 13

14 Figure 3 14

15 Overview MODBUS Compatible Communication for the VTI Model itc5000 Heat Tracing Control System The VTI Model itc5000 Heat Tracing Control System employs a compatible protocol for external communication, and a SmartBus compatible protocol for internal communication with Square-D Powerlink Remotely Operated Circuit Breaker. This document describes the compatible protocol implementation applicable to itc5000 registers, and programming parameters accessible through external communication. communicates via a half-duplex, master-slave architecture, and 2-wire, multidrop capable RS-485 interface. The itc5000 interface is seen as having a standard 1 load RS-485, which limits the maximum itc5000 system in one network to 32 cabinets. A larger network will require one or more RS-485 repeaters. The interface is optoelectronically isolated, which requires an external 5V power supply to power all itc5000 systems communication in the network. Alternatively, it can also be internally powered, but it losses its optoisolation due to a shared ground signal with internal circuitry. An RS-232 to RS-485 converter with suitable power supply is available from VTI for PC or other RS-232 equipped master applications. A visual troubleshooting aid is installed on the back of the itc5000 Scanning Controller board. The right LED column shows the internal communication activities, and the left LED column shows external communication activities. The two yellow LEDs indicate data transmit, and the two green LEDs indicate data receive. Slave Device ing and Communication Settings The slave address can be changed from the itc5000 Scanning Controller front panel. The address range is as specified in specification. The default value is 10. The communication baud rate is selectable between 9600 and bps with RTU (binary) only mode. Parity can be set to NONE, EVEN, or ODD and stopbit can be set at one or two stopbits. Two stopbits can only be used when parity is NONE. The default values are bps, EVEN parity, and one stopbit. Summary This section describes the itc5000 implementation of the protocol. Description itc Read Coil Status Read Circuit Breaker Status 03 Read Holding Registers Read Operating Parameters 04 Read Input Registers Read Input Variables 05 Force Single Coil Turn Single Circuit Breaker On/Off 06 Preset Single Register Single Byte write to Operating Parameter 16 Preset Multiple Registers Multiple Byte write to Operating Parameters 17 Report Slave ID Panel Size and Breaker Configuration 01 Read Circuit Breaker Status Table 8 15

16 This command is used to query the state of the circuit breakers on the panelboard. All positions are reported whether or not a breaker is present in a particular position. An empty position will be reported as OFF state. Valid request must have the first address as 1 and the number of point is the total number of available positions. Any query with the start address not 1, and number of points less than the total number of available positions, will be replied by an appropriate exception error. Example: A circuit breaker status query for a 42 position Panelboard beginning from circuit breaker 1 (note: address binary format is n 1) Query Frame 0x0A (10) 0x01 0x00 0x00 0x00 0x2A (42) Response Frame Byte Count 0x0A 0x01 0x06 Breakers 1-8 Data Byte 1 Breaker 9-16 Data Byte 2 Breaker Data Byte 3 Breaker Data Byte 4 Breaker Data Byte 5 Breaker Data Byte 6 Note that a 36 position panelboard will return 5 data bytes, and 24 position panelboard will return 3 data bytes. 16

17 03 Read Operating Parameters There are two types of operating parameters in the itc5000. The first one is the read only global operating parameters, which meant for informational only, except for the Temperature Feedback (TFB) parameter. These parameters and their corresponding Register addresses and returned values are shown in table 9. Parameter Register address Value Baud rate 1 3 = = Parity 2 0 = None 1 = Even 2 = Odd Stopbit 3 0 = 1 stopbit 1 = 2 stopbits Slave 4 1 to 247 Temperature Unit 5 Temperature Feedback* 6 0 = F 1 = C 0 = 1 = Ambient Switch 2 = Ambient RTD 3 = RTD * Temperature Feedback register can be read and written through command Table 9 Global Operating Parameters 17

18 The second type is the zone operating parameters. These parameters and their corresponding Register addresses and values are shown in table 10. Due to the large number of registers present in itc5000, register address numbering follows the following formula: Register = 100 x Zone number + Register Offset All odd and even numbered zones correspond to the left and right side of the panelboard, respectively. Parameter Register Offset Zone 1 Value 0 = Disabled 1 = Enabled RTD Temp feedback (RTFB) 2 1 to panel size Setpoint 3 LT+1 to HT-1 Dead band 4 ±1 to ±15 Current Delay 5 1 to 15 Temperature (LT) Limit 6 Min temp. to HT-1 Temperature (LT) Alarm Mode 7 0 = Disabled 1 = Enabled Temperature (HT) Limit 8 LT+1 to max temp. Temperature (HT) Alarm Mode 9 0 = Disabled 1 = Enabled Current (LC) Limit 10 0 to HC-1 Current (LC) Alarm Mode 11 0 = Disabled 1 = Enabled Current (HC) Limit 12 LC+1 to max Current Current (HC) Alarm Mode 13 0 = Disabled 1 = Enabled GFI Limit to 100 GFI Alarm Mode 15 Circuit Breaker Operation Mode 16 RTD Alarm Mode 17 Table 9 Global Operating Parameters 0 = Disabled 1 = Enabled 0 = Manual 1 = Auto 0 = Disabled 1 = Enabled All of these zone operating registers can be read and written by an appropriate command. 18

19 Example: A Setpoint and Dead band query to zone 11 will access register 1103 and 1104 (remember: address binary format is n-1) Query Frame (for 2 registers) 0x0A (10) 0x03 0x04 0x4E 0x00 0x02 Response Frame Byte Count Setpoint 0x0A 0x03 0x04 Data Byte 1 Setpoint Data Byte 2 Dead band Data Byte 3 Dead band Data Byte 4 The maximum number of points to query is 17. A query of more than 17 points will return an ILLEGAL_ADDRESS exception error. 19

20 04 Read Input Variables This command is used to query the itc5000 to report the values of a zone s temperature, current, ground fault current, and alarm status. All values are reported whether or not the corresponding breaker is ON. The master has to combine this information with the breakers status, and decide whether the values make sense. All values returned have to be scaled by 10 to account for an implied 1 decimal point in the itc5000 calculation. Register address numbering also follows the following formula: Register = 100 x Zone number + Register Offset All odd and even numbered zones correspond to the left and right side of the panelboard, respectively. Variable Register Offset Temperature 1 Current 2 Ground Fault Current 3 Status 4 Status is arranged as follows Byte 1 Byte 2 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Control bus CB RT GF HC LC HT LT Bit 8 Bit7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Alarmed Ack d Zone Zone WD X X X State State Test Enabled X = don t care A value of 1 in a position means a corresponding condition is active. 20

21 Example: A Temperature and Current value query for zone 15. Query Frame (for 2 registers) 0x0A (10) 0x04 0x05 0xDC 0x00 0x02 Response Frame Byte Count Temperature Temperature Current Current 0x0A 0x04 0x04 Data Byte 1 Data Byte 2 Data Byte 3 Data Byte 4 Another set of registers has also been setup to accommodate a faster transfer of these operating variables. Base registers address 5101 and 5201 can be used to query all odd and even numbered zones, respectively. Due to its specific operation, the beginning address has to be the base address, and the number of registers has to be multiples of 4 (the number of input registers per zone). The maximum number of registers queried at one transaction is 4 x one half the maximum numbers of zones (84 for 42 zones, 72 for 36 zones, and 48 for 24 zones). If the beginning address is not 5101 or 5201, or the number of registers is not multiples of 4, an ILLEGAL ADDRESS exception error will be returned. Example: A query for all operating variables of zones 1 and 3 for a total of 8 registers. Query Frame (for 2 left zones) 0x0A (10) 0x04 0x13 0xEC 0x00 0x08 Response Frame Byte Count Temperature Temperature Current Current 0x0A 0x04 0x10 (16) Data Byte 1 Data Byte 2 Data Byte 3 Data Byte 4 and so on until Data Byte 16. Bear in mind that all values need to be scaled by

22 05 Turn Single Circuit Breaker On/Off This function is used to turn an individual circuit breaker On or Off. The breakers are addressed from 1 through maximum size of the panelboard (24, 36, or 42). es are checked against this range. Out of range data will generate a 02 (Illegal ) exception error. Data is also checked for 0xFF00 for On, and 0x0000 for Off, and if neither, a 03 (Illegal Value) exception error will be returned. Example: A command to change the state of circuit breaker 13 to ON. Query Frame 0x0A (10) 0x05 0x00 0x0C 0xFF 0x00 Response Frame 0x0A (10) 0x05 0x00 0x0C 0xFF 0x00 22

23 06 Single Byte write to Operating Parameter Single byte write command can be used to write a value to one of the operating parameters as well as the Temperature Feedback register in the global operating parameter. Other parameters in the global operating parameters are read only since writing to one of the communication parameters will result in lose of connection, and changing the temperature unit will result in lose of precision due to integer mathematical operation in the itc5000. The communication parameters can be changed from the front panel, but the temperature unit is fixed from the factory. Register address numbering also follows the following formula (register offset is from Table 9): Register = 100 x Zone number + Register Offset Example: A command to change Setpoint of zone 5 to 75, which accesses register 503. Query Frame Data byte Data byte 0x0A (10) 0x06 0x01 0xF6 0x00 0x4B Response Frame Data byte Data byte 0x0A (10) 0x06 0x01 0xF6 0x00 0x4B A global write can be used to write a value to all zones. It is accessed by using this command to write to the last zone plus 1 (i.e. 43 for 42 circuit panelboard) base address plus the appropriate register offset. For example, a single byte write to register 4310 (4309 binary) will set the Current setpoint to the same value for all zones. To reset an alarm remotely, a write only RESET register has been implemented. This register acts like a signal that signals the itc5000 to reset its alarm. Write a 0xFF00 value to register 10 and any alarm will be acknowledged or reset appropriately. This register will be reset back to zero internally by the itc

24 16 Multiple Byte write to Operating Parameters Multiple byte write command can be used to write to several consecutive registers in the itc5000. The maximum number of registers to be written is 17 (see table 9), with the exception of global write, where it can only handle 2 consecutive registers in one multiple byte write command. Register address numbering also follows the following formula (register offset is from Table 9): Register = 100 x Zone number + Register Offset Example: A command to change Current Setpoint of zone 7 to 13, and Enable it at the same time. Query Frame # of registers # of registers Byte Count 0x0A (10) 0x10 0x02 0xC7 0x00 0x02 0x04 Data Byte 1 Data Byte 1 Data Byte 2 Data Byte 2 0x00 0x0D 0x00 0x01 Response Frame 0x0A (10) 0x10 0x02 0xC7 0x00 0x02 24

25 17 Report Slave ID This command is used to query the itc5000 to report its device ID, Run status, Panelboard size and the installed breaker type (1 or 2 pole breaker). The device ID is the same as SmartBus device ID to indicate that internally itc5000 uses SmartBus. Run status is also reported in accordance with PI-MBUS-300 specification. It does not have any real meaning in this application. Example: A 42 circuit panelboard itc5000 with 2 pole breaker for zone 1 and 2, an empty zone 7, and 1 pole breakers for the remaining positions. Query Frame 0x0A (10) 0x11 Response Frame Byte Count Device ID Run Status Panelboard Size 0x0A (10) 0x11 0x2D 0xF0 0xFF 0x2A (42) CB 1 CB 2 CB 3 CB 4 CB 5 CB 6 CB 7 0x02 0x00 0x00 0x02 0x01 0x01 0x00 CB 8 CB 9 CB 10 CB 11 CB 12 CB 13 CB 14 0x01 0x01 0x01 0x01 0x01 0x01 0x01 The rest of the frame will be the same indicating that the positions are occupied by single pole breakers. Notice how the 2-pole breakers are arranged on the panelboard. On the left hand side, the top position of the 2-pole breaker is active. On the right hand side, the bottom side of the 2-pole breaker is active. Remember that the odd and even numbered circuit breakers are located on the left and right hand side of the panelboard, respectively. Following the above configuration, CB1 is paired with CB3, and CB2 is paired with CB4. 25