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.
When selecting a frequency inverter, check the following details:
▪
Data provided by the manufacturer
▪
Electrical data of the pump set, particularly the rated current
▪
Ensure short start ramps (maximum 5 seconds)
▪
Only start speed-controlled operation after a minimum of 2 minutes.
Pump start-up with long start ramps and low frequency may cause clogging.
For frequency inverter operation of the pump set observe the following limits:
▪
Only utilise up to 95 % of the motor rating P
2
indicated on the name plate. (
▪
Frequency inverter operation produces RFI emissions of various extents, 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
the limits stipulated in EN 50081 always observe the EMC instructions of the inverter
manufacturer. If the inverter manufacturer recommends using a shielded power
cable, make sure to use a pump (set) with a shielded power cable.
The pump set generally meets the immunity requirements to EN 50082. To monitor
the fitted sensors the operator is responsible for providing interference immunity by
selecting suitable cables for the system and laying them properly. The power cable/
control cable of the pump set does not need to be modified. Suitable analysis
equipment has to be selected. To monitor the leakage sensor inside the motor, it is
recommended to use a special relay available from KSB.
5.4.1.4 Sensors
DANGER
Operating an incompletely connected pump set
Explosion hazard!
Damage to the pump set!
▷
Never start up a pump set with incompletely connected power cables or non-
operational monitoring devices.
CAUTION
Incorrect connection to power supply
Damage to the sensors!
▷
Observe the limits stated in the following sections of this manual when
connecting the sensors.
The pump set is equipped with sensors designed to prevent hazards and damage to
the pump set.
Selection
Start-up
Operation
Electromagnetic
compatibility
Generic immunity
5 Installation at Site
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Amarex KRT
Goodnal STP ST041 Sewage Delivery (Amarex KRT Submersible Motor Pump) Vendor Manual
Q-Pulse Id VM362
Active 29/10/2013
Page 30 of 96