KSB Amacan P 500-270 Installation & Operating Manual page 36

Selection When selecting a frequency inverter, check the following details:
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5 Installation at Site
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. (ð Section 4.4, Page 19)
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 sump / tank requires the use of level
control equipment.
Observe the minimum fluid level indicated. (ð Section 6.2.4.3, Page 45)
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.
DANGER
Operation outside the permitted frequency range
Explosion hazard!
▷ Never operate an explosion-proof pump set outside the specified range.
DANGER
Incorrect selection and setting of the frequency inverter
Explosion hazard!
▷ Observe the following information on selecting and setting a frequency
inverter.
▪ Data provided by the manufacturer
▪ Electrical data of the pump set, particularly the rated current
▪ Only voltage source inverters (VSI) with pulse width modulation (PWM) and
carrier frequencies between 1 and 16 kHz are suitable.
Amacan P