5.4
Electrical connection
5.4.1 Information for planning the control system
For the electrical connection of the pump set observe the wiring diagrams contained
in the Annex.
The pump set is supplied with power cables; it is wired for direct starting.
NOTE
When laying a cable between the control system and the pump set's connection point,
make sure that the number of conductors 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 nominal voltages
and voltage tolerances to IEC 38 or other grids or power supply facilities with max.
nominal voltage tolerances of ±10 %.
5.4.1.1 Overload protection
1. Protect the pump set against overloading by a thermal time-lag overload
protection device in accordance with IEC 947 and local regulations. (
2. Adjust 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 an explosion-proof 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 specified minimum fluid level. (
5.4.1.3 Frequency inverter operation
The pump set is suitable for frequency inverter operation as per IEC 60034-17.
DANGER
Operation outside the permitted frequency range
Explosion hazard!
▷
Never operate explosion-proof pump sets outside the specified range.
DANGER
Incorrect setting of frequency inverter current limit
Explosion hazard!
▷
Set the current limit to max. 1.2 times the rated current indicated on the name
plate.
Select the frequency inverter to match the following data:
Selection
5 Installation at Site
Amarex® N
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Goodnal STP ST041 Biological Treatment (KSB WAS PUMP 1 & 2 PU-0530-010 OM Instructions) Vendor Manual
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Active 29/10/2013
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