5.8.1 Setting the time relay
CAUTION
Switchover between star and delta on three-phase motors with star-delta starting takes
too long.
Damage to the pump (set)!
▷ Keep switch-over intervals between star and delta as short as possible (see table:
Time relay settings for star-delta starting).
Table 13: Time relay settings for star-delta starting:
Motor rating Y time to be set
≤ 30 kW < 3 s
> 30 kW < 5 s
5.8.2 Connecting the motor
NOTE
In compliance with DIN VDE 0530 - Part 8, three-phase motors are always wired for
clockwise rotation (looking at the motor shaft stub).
The pump's direction of rotation is indicated by an arrow on the pump.
1. Change the motor's direction of rotation to match that of the pump.
2.
Observe the manufacturer's product literature supplied with the motor.
5.8.3 Earthing
DANGER
Electrostatic charging
Explosion hazard!
Damage to the pump set!
▷ Connect PE conductor to the earthing terminal provided.
▷ On belt-driven pump sets use belts made of conductive material.
5.9 Checking the direction of rotation
DANGER
Temperature increase resulting from contact between rotating and stationary
components
Explosion hazard!
Damage to the pump set!
▷ Never check the direction of rotation by starting up the unfilled pump set.
▷ Separate the pump from the motor to check the direction of rotation.
WARNING
Hands or objects inside the pump casing
Risk of injuries, damage to the pump!
▷ Never insert your hands or any other objects into the pump.
▷ Check that the inside of the pump is free from any foreign objects.
CAUTION
Incorrect direction of rotation with non-reversible mechanical seal
Damage to the mechanical seal and leakage!
▷ Separate the pump from the motor to check the direction of rotation.
5 Installation at Site
36 of 78
KWP
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