Check The Direction Of Rotation - Edwards GV Series Instruction Manual

The thermal snap-switches will reset (that is, close again) when the pump cools down to a preset temperature
(see Section 2.5). We therefore recommend that your control equipment incorporates a manual reset device so that
the pump does not automatically switch on again when it cools down.
Use the following procedure to connect to the thermal snap-switches. If you connect to the thermal snap-switches
as described below, the output from the thermal snap-switches will be normally closed and will open when the pump
is too hot.
1. Refer to Figure 4 (page
snap-switch box (3), then remove the cover.
2. Remove the plastic bag from inside the box, then open the bag; this bag contains the crimp connectors and
insulators you will use to connect to the snap-switches.
3. Pass a suitably rated four-core cable through the cable-gland (5).
4. Fit the crimp connectors to the ends of the four wires in the cable (4), then fit the insulators around the
connections.
5. Fit the crimp connectors on one pair of wires (11) to the spade terminals (10) of the shut-down thermal
snap-switch (9).
6. Connect the other ends of the same pair of wires to the electrical-overload loop of your contactor.
7. Fit the crimp connectors on the remaining pair of wires (6) to the spade terminals (7) on the warning thermal
snap-switch (8).
8. Connect the other ends of the same pairs of wires to the warning circuit of your control equipment.
9. Tighten the cable-gland (5) to secure the cable in position.
10. Refit the cover (2) and secure with the four screws (1).
3.7

Check the direction of rotation

You must ensure that the direction of rotation of the pump is correct before you operate the
pump. If you do not, and the pump direction of rotation is incorrect, the inlet pipeline will be
pressurised and may be damaged and there will be a risk of injury to people or explosion or fire.
1. Refer to Figure 1. Undo and remove the four bolts which secure the coupling cover (15) to the coupling housing,
then remove the coupling cover.
2. Refer to Figure 10. Look into the coupling housing (5) and watch the drive hub (14), switch on the pump for one
or two seconds, then switch the pump off.
3. If the drive hub (14) does not rotate in the correct direction (shown by an arrow on the pump-motor:
item 18), the direction of rotation is incorrect. If the direction of rotation is incorrect:
Isolate the pump from the electrical supply.

Reverse the electrical supply phase-wires L1 and L2 in the pump-motor terminal-box: refer to

Repeat Steps 2 and 3 to ensure that the direction of rotation is now correct.

4. Refer to Figure 1. Refit the coupling cover (15) and secure with the four bolts. Tighten the bolts to a torque
between 3 and 5 Nm (2.2 and 3.7 lbf ft).
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18). Undo and remove the four screws (1) which secure the cover (2) to the thermal
WARNING
A705-61-880 Issue M
Figure 1,
Section 3.6.
Page 17