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Installation
Cables
These are the requirements to follow when you install cables:
• The cables must be in good condition, not have any sharp bends, and not be pinched.
• The sheathing must not be damaged and must not have indentations or be embossed
(with markings, etc.) at the cable entry.
• The cable entry seal sleeve and washers must conform to the outside diameter of the
cable.
• The minimum bending radius must not be below the accepted value.
• If using a cable which has been used before, a short piece must be peeled off when
refitting it so that the cable entry seal sleeve does not close around the cable at the
same point again. If the outer sheath of the cable is damaged, then replace the cable.
Contact a local sales and service representative.
• The voltage drop in long cables must be taken into account. The drive unit's rated
voltage is the voltage measured at the cable connection point in the pump.
Earthing (Grounding)
Electrical Hazard:
• You must earth (ground) all electrical equipment. This applies to the pump equipment,
the driver, and any monitoring equipment. Test the earth (ground) lead to verify that it is
connected correctly.
• If the motor cable is jerked loose by mistake, the earth (ground) conductor should be the
last conductor to come loose from its terminal. Make sure that the earth (ground)
conductor is longer than the phase conductors. This applies to both ends of the motor
cable.
• Risk of electrical shock or burn. You must connect an additional earth- (ground-) fault
protection device to the earthed (grounded) connectors if persons are likely to come
into physical contact with the pump or pumped liquids.
Earth (ground) conductor length
The earth (ground) conductor must be 200 mm ( 7.9 in.) longer than the phase conductors
in the junction box of the unit.
Connect the motor cable to the pump
CAUTION:
Leakage into the electrical parts can cause damaged equipment or a blown fuse. Keep the
end of the motor cable above the liquid level.
1. Check the data plate to see which connections are required for the power supply:
• Y
• D
• Y serial
• Y parallel
• Y/D
2. Arrange the connections on the terminal board in accordance with the required power
supply.
Do not use links (jumper strips) with the Y/D start.
Do not use links (jumper strips) with the 9 stator leads tandem-coupling.
3. Connect the motor conductors (U1, V1, W1, and earth (ground)) to the terminal board.
4. Make sure that the pump is correctly connected to earth (ground).
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Flygt 2125 Installation, Operation, and Maintenance Manual
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