© Edwards Limited 2012. All rights reserved.
Page 17
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
A373-10-880 Issue R
We recommend that you connect the electrical supply to the motor through a starter or circuit breaker which has
thermal over-current protection which can be adjusted to suit the full-load current ratings shown on the motor rating
plate. The fuse ratings must be calculated by a qualified electrician. The supplier of your thermal over-current
protection device may specify fuse ratings to ensure correct operation of the over-current protection device. Ensure
that the fuse you use is suitable for the starting currents given on the motor rating late.
The diameter of the outer sheath of the electrical cable must be in the range 10-14 mm. The cable must conform in
size and colour coding with your local and national electrical installation regulations. The temperature rating of the
cable must be 70 °C or greater.
1. Remove the cover from the motor terminal-box.
2. Remove the cable-gland from the inside of the terminal-box and fit the cable-gland to the cable leadthrough
hole in the side of the terminal-box.
3. For motor wiring information refer to the wiring diagram supplied in the motor terminal box. You can configure
the dual voltage motors to operate with either the high range or low range electrical supply.
4. Pass the electrical supply cable through the cable-gland and connect to the appropriate terminals. You must
tighten the earth (ground) terminal connection to a torque of 2.13 to 2.87 Nm.
5. Tighten the cable gland until the outer sheath of the cable is firmly gripped. Do not overtighten.
6. Ensure that the gasket seal for the terminal box cover is correctly positioned, then refit the cover to the
terminal-box and secure with the screws.
3.7.2
Check the direction of rotation
CAUTION
Ensure that the motor rotates in the correct direction. If it does not, the pump and your vacuum system can
become pressurized when you operate the pump.
1. With the pump inlet still unconnected, watch the motor cooling-fan through the motor fan-cover, switch-on the
electrical supply to the motor for a few seconds, then switch off the electrical supply again.
2. Check that the motor cooling-fan rotates in the correct direction shown by the arrow on the motor mounting
plate. If the direction of rotation is incorrect:
Switch off the electrical supply immediately.
Isolate the pump from the electrical supply.
Remove the terminal-box cover and swap wires L1 and L3: refer to wiring diagram supplied in the motor
terminal box.
Refit the cover to the terminal-box.
3.8
Connect the pump inlet
Take note of the following information when you connect the pump to your vacuum system. Refer to
for
details of the accessories mentioned below.
For optimum pumping speeds, ensure that the pipeline connected to the inlet-port is as short as possible and
has an internal diameter not less than the inlet-port diameter.
Support the vacuum pipelines to prevent loading of the coupling-joints.
If necessary, incorporate flexible bellows in your system pipelines to reduce the transmission of vibration and
to prevent loading of coupling-joints. If you use flexible bellows, you must ensure that you use bellows which
have a maximum pressure rating which is greater than the highest pressure that can be generated in your
system. We recommend that you use Edwards flexible bellows.
