Check The Direction Of Rotation - Edwards E2M28 Instruction Manual

We recommends connecting the electrical supply to the motor through a starter or
circuit breaker that has thermal over-current protection and 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 person. The supplier of the thermal over-current protection
device may specify fuse ratings to ensure correct operation of the over‑current
protection device. Ensure that the fuse used is suitable for the starting currents given on
the motor rating plate.
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 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. Using a tool, tighten
to a torque of 3.75 Nm.
3. For motor wiring information refer to the wiring diagram supplied in the motor
terminal box. The dual voltage motors can be configured 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. Tighten the earth (ground) terminal connection to a torque
of 2.13 to 2.87 Nm.
5. Tighten the dome shaped nut on the cable gland until the outer sheath of the
cable is firmly gripped. Using a tool, tighten to a torque of 2.5 Nm. 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.

4.7.2 Check the direction of rotation

CAUTION:
Ensure that the pump‑motor rotates in the correct direction. If it does not, the pump
and your vacuum system can become pressurised.
1. With the pump inlet unconnected, watch the motor cooling-fan through the motor
fan-cover.
2. Switch on the electrical supply to the motor for a few seconds, then switch off the
electrical supply again.
3. 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:
A.
B.
C.
D.
A37310880_V - Installation
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 the wiring
diagram supplied in the motor terminal box.
Refit the cover to the terminal-box.
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