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5 Installation at Site
37 of 126
Amacan S
1589.837/01-EN
5.4 Electrical system
5.4.1 Information for planning the control system
For the electrical connection of the pump set observe the “Wiring diagrams” section.
(
The pump set is supplied with power cables; it is wired for DOL starting. Star-delta
starting is possible.
NOTE
When laying a cable between the control system and the pump set's connection
point, verify that the number of cores is sufficient for the sensors. A minimum cross-
section of 1.5 mm² is required.
The motors can be connected to electrical low-voltage grids with mains voltages and
voltage tolerances to IEC 60038. The permissible tolerances must be observed.
5.4.1.1 Setting the overload protection device
1. Protect the pump set against overloading by a thermal time-lag overload
protection device in accordance with IEC 60947 and local regulations.
2. Set the overload protection device to the rated current specified on the name
plate. (
5.4.1.2 Level control
DANGER
Pump set running dry
Explosion hazard!
▷
Never allow a pump set to run dry.
CAUTION
Fluid level below the specified minimum
Damage to the pump set by cavitation!
▷
Never allow the fluid level to drop below the specified minimum.
Automatic operation of the pump set in a tank requires the use of level control
equipment.
Observe the minimum level of fluid handled. (
5.4.1.3 Operation on a frequency inverter
The pump set is driven by an induction machine to IEC 60034-12 designed for fixed
speed operation. In accordance with IEC 60034-25, section 18, the pump set is
suitable for operation on a frequency inverter.
NOTE
For pump sets with rated voltages exceeding 500 V, a dv/dt filter should be fitted at
the output of the frequency inverter to reduce the rate of voltage rise to the limits
specified in IEC 60034-25, Section 18. Otherwise a considerably reduced service life
of the insulation system has to be expected.