Instruction Manual B023-04-880 Issue E Original Vapour Pump Thermal Snap-Switches Description Cooling-Fail Thermal Snap-Switch Cooling-Fail Thermal Snap-Switch Cooling-Fail Thermal Snap-Switch Pump-Ready Thermal Snap-Switch Boiler-Protection Thermal Snap-Switch Item Number B023-02-000 B023-04-002 B279-03-006 B023-04-000 B023-04-001
Important safety Information Vacuum pumps are potentially dangerous if incorrectly used, repaired or maintained, so please approach the repair or maintenance with caution. Any incorrectly fitted spare parts could damage your pump and could be potentially dangerous. Never allow unqualified personnel to attempt to remove or replace any part of the pump. If you have any doubts about the servicing procedures or the products capabilities please contact Edwards. Before returning any equipment to Edwards for repair please follow the Edwards HS1 procedure and complete an HS2 declaration form to warn of any substances used or produced in the equipment that can be dangerous. The procedure and forms are included with the pump instruction manuals and can be downloaded together with Edwards local contact details from www.edwardsvacuum.com Always conform to service schedules unless adverse conditions necessitate more frequent servicing. Report any defect before an accident or consequential damage can occur. Observe local and country specific regulations, norms and guidelines. Never allow anyone to remove large or heavy components without adequate lifting equipment. Before maintenance work is begun, ensure the pump is switched off and isolated from the mains. The pump may have been exposed to processes which use hazardous substances or produces by-products which are dangerous to human health and safety, for example, chemically active, biologically active or radioactive substances. Before working on a pump, ensure that the correct personal protective equipment is available and being used. Always wear safety goggles. Wear a breather mask with positive air pressure and take other precautions if you believe the pump may be contaminated with hazardous substances and dusts. When applying sealants and lubricants, prevent contact with the skin by wearing suitable gloves. Seals may contain fluoroelastomer, which when properly handled is not dangerous but which may produce a toxic and corrosive residue (hydrogen fluoride or hydrofluoric acid) in the event of excessive heat or fire depending on the circumstances of degradation and other materials involved. On completion of maintenance, check the pump functions correctly and that all guards and protection devices are fitted and working correctly and that the pump is electrically safe. If the pump is used for handling hazardous substances check the pump for leak-tightness before use. Dispose of waste oil and any process by-products in accordance with local and national safety and environmental requirements. It is usually illegal to dispose of waste oil into drains or water courses, or to bury it. Edwards Limited Manor Royal Crawley, West Sussex, UK RH10 9LW Tel: +(44) 1293 528844 Fax: +(44) 1293 533453 Edwards Limited 2008. Edwards and the Edwards logo are trademarks of Edwards Limited.
Contents Section Page 1 Introduction... 1 Contents 2 Pump-Ready Thermal Snap-Switch... 2 2.1 Description... 2 2.2 Technical data... 2 2.3 Installation... 2 2.3.1 Unpack and inspect... 2 2.3.2 Fit the Pump-Ready Thermal Snap-Switch to the pump... 3 2.4 Operation... 3 3 Cooling-Fail Thermal Snap-Switches... 4 3.1 Description... 4 3.2 Technical data... 4 3.3 Installation... 6 3.3.1 Unpack and inspect... 6 3.3.2 Fit Cooling-Fail Thermal Snap-Switch B023-02-000 to the pump... 7 3.3.3 Cooling-Fail Thermal Snap-Switch B023-02-000 electrical connections... 7 3.3.4 Fit Cooling-Fail Thermal Snap-Switches B279-03-006 and B023-04-002 to the pump... 9 3.4 Operation... 9 4 Boiler-Protection Thermal Snap-Switch... 10 4.1 Description...10 4.2 Technical data...10 4.3 Installation...10 4.3.1 Unpack and inspect...10 4.3.2 Fit the Boiler-Protection Thermal Snap-Switch to the pump...11 4.4 Operation...12 5 Maintenance... 13 Ipsitech 9001(21)-2008 Edwards Limited 2008. All rights reserved. Page i
Contents Illustrations Figure Page 1 Pump-Ready Thermal Snap-Switch dimensions (mm)... 3 2 Cooling-Fail Thermal Snap-Switch B023-02-000 dimensions (mm)... 5 3 Cooling-Fail Thermal Snap-Switches B279-03-006 and B023-04-002 dimensions (mm)... 5 4 Component parts of Cooling-Fail Thermal Snap-Switch B023-02-000... 8 5 Method of mounting the Cooling-Fail Thermal Snap-Switch B023-02-000... 8 6 Boiler-Protection Thermal Snap-Switch dimensions (mm)...11 Tables Table Page 1 Pump-Ready Thermal Snap-Switch technical data... 2 2 Pump-Ready Thermal Snap-Switch checklist of items... 2 3 Cooling-Fail Thermal Snap-Switches technical data... 4 4 Cooling-Fail Thermal Snap-Switch B023-02-000 checklist of items... 6 5 Cooling-Fail Thermal Snap-Switches B279-03-006 and B023-04-002 checklist of items... 6 6 Boiler-Protection Thermal Snap-Switch technical data...10 7 Boiler-Protection Thermal Snap-Switch checklist of items...10 Page ii Edwards Limited 2008. All rights reserved.
1 Introduction This manual provides installation, operation and maintenance instructions for the Edwards Cooling-Fail, Pump-Ready and Boiler-Protection Thermal Snap- Switches. You must use the thermal snap-switches as described in this manual. Read this manual and the instruction manual supplied with your vapour pump before you install and use the thermal snap-switches. Important safety information is highlighted as WARNING and CAUTION instructions; you must obey these instructions. The use of WARNINGS and CAUTIONS is defined below. Introduction WARNING Warnings are given where failure to observe the instruction could result in injury or death to people. CAUTION Cautions are given where failure to observe the instruction could result in damage to the equipment, associated equipment and process. The following IEC warning label appears on the thermal snap-switches: Warning - risk of electric shock. The units used throughout this manual conform to the SI international system of units of measurement. Edwards Limited 2008. All rights reserved. Page 1
Pump-Ready Thermal Snap-Switch 2 Pump-Ready Thermal Snap-Switch 2.1 Description This snap-switch is mounted directly on Edwards vapour pumps. The snap-switch opens at a preset temperature to indicate that the pump is at operating temperature. The snap-switch can be used to control the opening of the pumping system high-vacuum valve. The Pump-Ready Thermal Snap-Switch is designed for use with the following Edwards vapour pumps : EO4/EO9 EO40/55 EO50/60 EO100/90 All Diffstak models SI100 2.2 Technical data Table 1 - Pump-Ready Thermal Snap-Switch technical data Dimensions See Figure 1 Electrical rating 6 A at 120 V a.c. resistive 3 A at 240 V a.c. resistive 7 A at 30 V a.c./d.c. resistive Contact opening temperature 80 ± 2.8 C Contact closing temperature 60 ± 2.8 C 2.3 Installation 2.3.1 Unpack and inspect 1. Remove all packing materials and check the snap-switch. 2. If the snap-switch is damaged, notify your supplier and the carrier in writing within three days; state the Item Number of the snap-switch together with the order number and your supplier s invoice number. Retain all packing material for inspection. Do not use the snap-switch if it is damaged. 3. Check that your package contains the items listed in Table 1. If any of these items is missing, notify your supplier in writing within three days. Table 2 - Pump-Ready Thermal Snap-Switch checklist of items Quantity Description Check ( ) 1 Thermal Snap-Switch 2 Pan-head screws M3 x 5 Page 2 Edwards Limited 2008. All rights reserved.
2.3.2 Fit the Pump-Ready Thermal Snap-Switch to the pump The switch mounting plate has two 3.56 mm diameter holes designed to align with the standard mounting plates on Edwards vapour pumps (usually located on the backing-condenser). The procedure for installation of the snap-switch is as follows: 1. Apply a light coat of heat sink compound (Dow Corning 340 or other suitable alternative) to the contact face of the thermal snap-switch. 2. Locate the snap-switch over the correct mounting point (see the instruction manual supplied with your pump) with the mounting holes aligned. 3. Secure the snap-switch in place with the screws supplied. 4. Connect the snap-switch electrical signal leads to your control equipment. 2.4 Operation Once correctly installed, the snap-switch will operate automatically and requires no adjustment. The normally-closed snap-switch contacts will open at the specified temperature. Once the snap-switch cools, the contacts close again (that is, the snap-switch automatically resets) at the specified reset temperature. Refer to Section 2.2 for the opening and closing temperatures. Figure 1 - Pump-Ready Thermal Snap-Switch dimensions (mm) Pump-Ready Thermal Snap-Switch Edwards Limited 2008. All rights reserved. Page 3
Cooling-Fail Thermal Snap-Switches 3 Cooling-Fail Thermal Snap-Switches 3.1 Description These snap-switches are mounted directly on Edwards vapour pumps. The snap-switches open at a preset temperature to indicate failure of the cooling-water (or air) flow. These snap-switches will reset (that is, close again) when the pump cools down to a preset temperature. We therefore recommend that your control equipment incorporates a manual reset device to prevent automatic switchon of the pump again when it cools down. If you do not have a manual reset device (and the fault which caused the snap-switch to open has not been corrected), the pump will alternately switch on and off as it cools down and heats up again. Three models of Cooling-Fail Thermal Snap-Switch are available, for different Edwards vapour pumps, as follows: Item Number B279-03-006 B023-02-000 B023-04-002 3.2 Technical data Suitable for pumps EO40/55, EO50/60, EO100/90, SI100 All Diffstak models, EO2K (water and air-cooled), EO4K, EO6K, EO9K, EO12, EO16, EO20, EO400, F3605, 18B4A, 30B5A TVA50/60, TVW50/60 Table 3 - Cooling-Fail Thermal Snap-Switches technical data Snap-Switch B023-02-000 Dimensions See Figure 2 Electrical rating 25 A at 120 V a.c. 20 A at 240 V a.c. Contact opening temperature 46 ± 3 C Contact closing temperature 38 ± 3 C Snap-Switch B279-03-006 Dimensions See Figure 3 Electrical rating 15 A at 120 V a.c. resistive 10 A at 240 V a.c. resistive Contact opening temperature 50 ± 3 C Contact closing temperature 35 ± 3 C Snap-Switch B023-04-002 Dimensions See Figure 3 Electrical rating 15 A at 120 V a.c. resistive 10 A at 240 V a.c. resistive Contact opening temperature 60 ± 3 C Contact closing temperature 50 ± 3 C Page 4 Edwards Limited 2008. All rights reserved.
Figure 2 - Cooling-Fail Thermal Snap-Switch B023-02-000 dimensions (mm) Figure 3 - Cooling-Fail Thermal Snap-Switches B279-03-006 and B023-04-002 dimensions (mm) Cooling-Fail Thermal Snap-Switches Edwards Limited 2008. All rights reserved. Page 5
Cooling-Fail Thermal Snap-Switches 3.3 Installation 3.3.1 Unpack and inspect 1. Remove all packing materials and check the snap-switch. 2. If the snap-switch is damaged, notify your supplier and the carrier in writing within three days; state the Item Number of the snap-switch together with the order number and your supplier s invoice number. Retain all packing material for inspection. Do not use the snap-switch if it is damaged. 3. Check that your package contains the items listed in the appropriate Table 4 or 5. If any of these items is missing, notify your supplier in writing within three days. Table 4 - Cooling-Fail Thermal Snap-Switch B023-02-000 checklist of items Quantity Description Check ( ) 1 Thermal Snap-Switch 2 Nylon spacers 1 20 mm lock-ring 1 Cable-gland 1 Conduit box 2 Cheese-head screws M4 x 16 1 Cheese-head screw M4 x 30 1 M4 nut 2 M4 plain washers 2 M4 spring washers 1 M4 shake-proof washer 1 Spacer Table 5 - Cooling-Fail Thermal Snap-Switches B279-03-006 and B023-04-002 checklist of items Quantity Description Check ( ) 1 Thermal Snap-Switch 2 Pan-head screws M3 x 5 Page 6 Edwards Limited 2008. All rights reserved.
3.3.2 Fit Cooling-Fail Thermal Snap-Switch B023-02-000 to the pump The component parts of the thermal snap-switch are shown in Figure 4. The method used to secure the snap-switch is shown in Figure 5. Refer to the instruction manual supplied with your pump for the correct location of the snapswitch. 1. Refer to Figure 5. Remove the conduit box cover, screw the cable-gland into the cable leadthrough hole in the box and secure with the plastic lock-ring. 2. Insert two M4 x 16 cheese-head screws through the mounting holes of the snap-switch. 3. Place the two plastic spacers over the screws, align and insert the snap- switch into the conduit box. 4. Lightly coat the snap-switch contact face with heat sink compound (Dow Corning 340 or suitable substitute). 5. Use M4 screws to secure the conduit box to the pump mounting plate. 3.3.3 Cooling-Fail Thermal Snap-Switch B023-02-000 electrical connections WARNING Incorporate a manual reset device in your control equipment. If you do not (and a fault which causes the snap-switch to open is not corrected), the pump will alternately switch on and off as it cools down and heats up again. WARNING You must use a suitable earth (ground) cable to connect the earth (ground) point on the thermal snap-switch mounting plate to the earth (ground) point in the pump electrical box. 1. If conduit is to be used to carry the snap-switch output signals, fit a male plastic bush (not supplied) to the interior of the conduit box. Cooling-Fail Thermal Snap-Switches 2. Pass the electrical signal cable(s) through the cable-gland and/or the male strain-relief gland (not supplied), then connect the cable(s) to the electrical terminals (see Figure 4, item 8). 3. Use a suitable earth (ground) cable to connect the earth (ground) point on the snap-switch mounting plate to the earth (ground) point in the electrical box of the pump: Refer to Figure 5 detail A for the positions of the earth (ground) points on the snap-switch mounting plate. Refer to Figure 5 details B and C for details of the connection of your earth (ground) wire to the earth (ground) point. Refer to the pump instruction manual for information on the earth (ground) connections on the pump. 4. Secure the cover to the conduit box. Edwards Limited 2008. All rights reserved. Page 7
Cooling-Fail Thermal Snap-Switches Figure 4 - Component parts of Cooling-Fail Thermal Snap-Switch B023-02-000 1. Conduit box 2. Spacer 3. Mounting screw 4. Diffusion pump mounting plate 5. Plastic lock-ring 6. Plastic female screwed bush 7. Conduit box cover 8. Electrical terminals Figure 5 - Method of mounting the Cooling-Fail Thermal Snap-Switch B023-02-000 A. Interior of the snap-switch B. Earth (ground) connection: option 1 C. Earth (ground) connection: option 2 1. Earth (ground) screw 2. Star washer 3. Spacer 4. Diffusion pump mounting plate 5. Conduit box 6. Plain washer 7. Nut Page 8 Edwards Limited 2008. All rights reserved.
3.3.4 Fit Cooling-Fail Thermal Snap-Switches B279-03-006 and B023-04-002 to the pump The snap-switch mounting plate has two 3.56 mm diameter holes which align with the standard mounting plates (which are located on the cooling-fins) on EO40/55, EO50/60, EO100/90, TVA50/60, TVW50/60 and SI100 vapour pumps. Install the snap-switch as follows : 1. Apply a light coat of heat sink compound (Dow Corning 340 or other suitable alternative) to the contact face of the thermal snap-switch. 2. Locate the snap-switch over the correct mounting point (see the instruction manual supplied with your pump) with the mounting holes aligned. 3. Secure the snap-switch in place with the screws supplied. 4. Connect the snap-switch electrical signal leads to your control equipment. 3.4 Operation WARNING Incorporate a manual reset device in your control equipment. If you do not (and a fault which causes the snap-switch to open is not corrected), the pump will alternately switch on and off as it cools down and heats up again. Once correctly installed, the snap-switch will operate automatically and require no adjustment. The normally-closed snap-switch contacts will open at the specified temperature. Once the snap-switch cools, the contacts close again (that is, the snap-switch automatically resets) at the specified reset temperature. Your control equipment must be suitable for this method of operation (see Section 3.1). Cooling-Fail Thermal Snap-Switches Refer to Section 3.2 for the contact opening and closing temperatures. Edwards Limited 2008. All rights reserved. Page 9
Boiler-Protection Thermal Snap-Switch 4 Boiler-Protection Thermal Snap-Switch 4.1 Description The Boiler-Protection Thermal Snap-Switch is mounted directly on Edwards vapour pumps. The snap-switch opens at a preset temperature when the pump boiler base exceeds the maximum safe operating temperature. The snap-switch will reset (that is, close again) when the pump cools down to a preset temperature. We therefore recommend that your control equipment incorporates a manual reset device to prevent automatic switch-on of the pump again when it cools down. If you do not have a manual reset device (and the fault which caused the snap-switch to open has not been corrected), the pump will alternately switch on and off as it cools down and heats up again. The Boiler-Protection Thermal Snap-Switch is designed for use with the Edwards EO40/55, EO50/60 and SI100 vapour pumps. 4.2 Technical data 4.3 Installation 4.3.1 Unpack and inspect Table 6 - Boiler-Protection Thermal Snap-Switch technical data Dimensions See Figure 6 Electrical rating 15 A at 220 V a.c. 50/60 Hz 10 A at 240 V a.c. 50/60 Hz Contact opening temperature 200 ± 4.4 C Contact closing temperature 184 ± 4.4 C 1. Remove all packing materials and check the snap-switch. 2. If the snap-switch is damaged, notify your supplier and the carrier in writing within three days; state the Item Number of the snap-switch together with the order number and your supplier s invoice number. Retain all packing material for inspection. Do not use the snap-switch if it is damaged. 3. Check that your package contains the items listed in Table 7. If any of these items is missing, notify your supplier in writing within three days. Table 7 - Boiler-Protection Thermal Snap-Switch checklist of items Quantity Description Check ( ) 1 Thermal Snap-Switch 2 Pan-head screws M3 x 5 Page 10 Edwards Limited 2008. All rights reserved.
4.3.2 Fit the Boiler-Protection Thermal Snap-Switch to the pump The snap-switch mounting plate has two 3.56 mm diameter holes which align with any pair of the four tapped holes in the pump-ready thermal snap-switch mounting plate of the EO40/55, EO50/60 and SI100 vapour pumps. This allows you to fit a Boiler-Protection Thermal Snap-Switch and a Pump-Ready Thermal Snap-Switch at the same time, while a tapped hole will still be available as an earthing (grounding) point for the pump body. Install the snap-switch as follows : WARNING Incorporate a manual reset device in your control equipment. If you do not (and a fault which causes the snap-switch to open is not corrected), the pump will alternately switch on and off as it cools down and heats up again. 1. Apply a light coat of heat sink compound (Dow Corning 340 or other suitable alternative) to the contact face of the thermal snap-switch. 2. Locate the snap-switch over the correct mounting point (see the instruction manual supplied with your pump) with the mounting holes aligned. You can use any of the four holes. 3. Secure the snap-switch in place with the screw supplied. 4. Connect the snap-switch electrical signal leads to your control equipment. Figure 6 - Boiler-Protection Thermal Snap-Switch dimensions (mm) Boiler-Protection Thermal Snap-Switch Edwards Limited 2008. All rights reserved. Page 11
Boiler-Protection Thermal Snap-Switch 4.4 Operation Once correctly installed, the snap-switch will operate automatically and require no adjustment. The normally-closed snap-switch contacts will open at the specified temperature. Once the snap-switch cools, the contacts close again (that is, the snap-switch automatically resets) at the specified reset temperature. Your control equipment must be suitable for this method of operation (see Section 4.1). Refer to Section 4.2 for the contact opening and closing temperatures. Page 12 Edwards Limited 2008. All rights reserved.
5 Maintenance The snap-switches require no regular maintenance. We recommend that, as part of your normal regular vapour pump maintenance, you check the electrical connections to ensure that they remain secure. Maintenance Edwards Limited 2008. All rights reserved. Page 13
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