5 Installation at Site
38 of 126
Amacan K
1579.807/07-EN
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.
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 25 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.
Interference immunity
The submersible motor pump generally meets interference immunity requirements.
For monitoring the sensors installed the operator must ensure sufficient interference
immunity by appropriately selecting and laying the power cables in the plant. No
modifications are required on the power/control cable of the submersible motor
pump. Suitable analysing devices must be selected. To monitor the leakage sensor
inside the motor using a special relay available from KSB is recommended.
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 electric cables or non-
operational monitoring devices.
