KSB Amarex User Manual

5 Installation at Site
32 of 82
Amarex
2573.820/02-EN
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.
(ðSection6.2.2,Page38)
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 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 minimum level of fluid handled.
5.4.1.3 Operation on a frequency inverter, only standard pump sets (version US):
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.
Selection When selecting a frequency inverter, check the following details:
▪ 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.
Setting Observe the following instructions for setting a frequency inverter:
▪ Set the current limit to max. 1.2 times the rated current. The rated current is
indicated on the name plate.
Start-up Observe the following instructions for starting the frequency inverter:
▪ Ensure short start ramps (maximum 5 seconds).
▪ Only start variable speed control after 2minutes at the earliest.
Pump start-up with long start ramps and low frequency may cause clogging.
Operation Observe the following limits during operation on a frequency inverter:
▪ Only utilise up to 95% of the rated powerP
2
indicated on the name plate.
▪ Frequency range 30 to 50Hz
Electromagnetic
compatibility
Operation on a frequency inverter produces interference emissions whose level varies
depending on the inverter used (type, interference suppression, make). To prevent
the drive system, consisting of a submersible motor and a frequency inverter, from
exceeding any given limits always observe the EMC information provided by the
inverter manufacturer. If the inverter manufacturer recommends a shielded power
cable, make sure to use a submersible motor pump with shielded power cables.

KSB Amarex Specifications

General

Material	Cast iron, stainless steel
Operating mode	Continuous
Type	Submersible Pump
Application	Sewage
Explosion protection	Available with explosion protection
Frequency	50 Hz, 60 Hz
Impeller Type	Multi-vane