9
Connection Requirements (External Protection Devices)
•The supply authority must be notified before installing the pump if it will be connected to the public
mains. When the pump is connected to the public power supply, it may cause flickering of
incandescent lamps when started.
•The mains voltage and frequency must agree with the specifications on the data plate. The supply
voltage and frequency variation must be within ±1% of the rated voltage. If the pump can be
connected to different voltages, then the connected voltage is specified by a yellow sticker close to
the cable entry.
•The pump is to be supplied through a residual current device (RCD) having a rated residual current
not exceeding 30mA.
•The fuses and circuit breakers must have the proper rating, and the pump overload (motor
protection breaker) must be connected and set to the rated current according to the data plate and if
applicable the cable chart.
•The starting current in direct-on-line start can be up to six times higher than the rated current. When
start-delta is used, the current is reduced by the factor 0.58 (1/3), which must be taken into account
when setting the circuit breakers.
•The fuse rating and the cables must be in accordance with the local rules and regulations.
•If an intermittent operation is prescribed, then the pump must be provided with monitoring equipment
supporting such operation.
NOTICE
It is possible to control the water level by combining float switches with an analog pressure sensor. Two
additional safety float switches can be installed in the dedicated Control System for high-level and dry-running
alarm.
•The thermal contacts/thermistors must be in use.
•The cables must be in good condition, not have any sharp bends, and not be pinched.
•The voltage drop in long cables must be taken into account. The drive unit's rated voltage measured
at the cable connection point in the pump.
Grounding (Earthing)
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 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.
•Connecting the Power Cables
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 nameplate for output and voltage required for the pump.
2. Connect the power cables, including ground (earth), to the terminal or starter unit.
3. It is important that the pump should be properly grounded and provided with a leakage breaker to prevent
the users from serious electric shock injury.
4. Firmly tighten the cable entry into its bottom-most position.
