• If the pump will be connected to the public mains, then the supply authority must be
notified before installing the pump. When the pump is connected to the public power
supply, it can cause flickering of incandescent lamps when started.
• The mains voltage and frequency must agree with the specifications on the data plate.
If the pump can be connected to different voltages, then follow the specified voltage
on the yellow sticker close to the cable entry.
• If the operation can be intermittent, such as S3 periodic duty, then the pump must be
supplied with monitoring equipment supporting such operation.
• If stated on the data plate, then the motor is convertible between different voltages.
• The thermal contacts or thermistors must be in use.
• For FM-approved pumps, a leakage sensor must be connected and in use to meet
approval requirements.
Motor and short-circuit protection
A qualified electrician must select the size of motor protection breakers and fuses, so that
it is sufficient for the specific motor data such as rated current and starting current.
It is important that the short-circuit protection is not over-dimensioned. Over-
dimensioned fuses and motor protection breakers decrease the protection for the motor.
• The fuse rating and the cables must be in accordance with the local rules and
regulations.
• The fuses and circuit breakers must have the correct rating. The pump overload
protection must be connected and set to the rated current. See the data plate and if
applicable the cable chart for the rated current. The starting current in direct-on-line
start can be up to six times higher than the rated current.
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 cables 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 jacket of the cable is damaged, then replace the cable.
Contact a sales or authorized 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.
• The screened cable must be used according to the European CE and EMC
requirements if a Variable Frequency Drive (VFD) is used. For more information,
contact a sales or authorized service representative (VFD-supplier).
• Make sure that the cable is long enough for maintenance work.
• For SUBCAB
®
cables, the twisted pair copper foil must be trimmed.
• All unused conductors must be insulated.
4.9.2 Grounding (earthing)
Grounding (earthing) must be done in compliance with all local codes and regulations.
DANGER: Electrical Hazard
All electrical equipment must be grounded (earthed). Test the ground (earth) lead to
verify that it is connected correctly and that the path to ground is continuous.
4 Installation
Flygt 3102 Installation, Operation, and Maintenance Manual 27
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