© Edwards Limited 2007. All rights reserved. Page 11
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Installation
A371-32-880 Issue C
3.6.1 Connect the pump to your electrical supply
Note: The pump will restart automatically when the electrical supply is restored after an interruption and when
the pump cools after it has overheated. If you do not want the pump to restart automatically, use electric
control equipment that must be reset manually.
Make the electrical connections to the pump motor with an IEC 320 cable socket (cold condition type) that satisfies
your local electrical standards. A range of suitable cables are available from your supplier or Edwards.
The pump must be connected to a suitable fused and protected electrical supply and suitable earth point.
If your EM pump was supplied with an electrical supply cable, the cable will be fitted with a moulded IEC connector
at one end. The other end of the cable may be fitted with a plug suitable for your local electrical supply. A cable
without a plug will contain wires colour coded as follows:
1. Insert the moulded IEC connector at the end of the cable into the electrical inlet connector on the motor.
2. Connect the plug (if fitted) at the other end of the cable to you electrical supply. If a plug is not fitted, connect
the wires in the cable to the correct terminals of your electrical supply.
3.6.2 Check the direction of rotation
Ensure that the pump-motor rotates in the correct direction. If it does not, the pump and your vacuum system
can become pressurised.
Refer to Figure 1.
1. Watch the motor-cooling fan through the fan cover on the end of the motor.
2. Switch on the electrical supply to the motor for a few seconds.
3. Check that the motor-cooling fan rotates in the direction shown by the arrow (6) on the end of the oil box. If the
rotation direction is incorrect, immediately switch off the electrical supply and contact your supplier or Edwards
for advice.
3.7 Inlet-port connection
3.7.1 General requirements
To connect the pump to your vacuum system, you can use either the inlet-port on the top of the pump (Figure 1,
item 12) or the inlet-port on the side of the pump (not shown). To use the side inlet-port, refer to the procedure in
Section 3.7.2.
When you use either the top or the side inlet-port, you can:
z Connect to the NW10 flange supplied on the pump; use the centring ring and o-ring supplied.
z Remove the NW10 flange and connect to the 3/8 inch BSP threaded hole.
z Remove the NW10 flange and replace it with a NW25 flange adaptor (available as an optional accessory, see
Section 7) and then connect to the NW25 flange.
Table 3 – Wire colour codes
Convention Earth Neutral Live
Europe green and yellow blue brown
USA green white black
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