The motors may be connected to electrical low-voltage grids with nominal voltages
and voltage tolerances to IEC 38 or other grids or power supply facilities with
maximum 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
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 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:
▪
Data provided by the manufacturer
▪
Electrical data of the pump set, particularly the rated current
▪
Ensure short start ramps (max. 5 s)
▪
Only start speed-controlled operation after 2 minutes at the earliest.
Pump start-up with long start ramps and low frequency may cause clogging.
Observe the following limits when operating the pump set via frequency inverter:
▪
Only utilise up to 95 % of the motor power rating P
2
indicated on the name
▪
If the pump sets are operated via frequency inverter, RFI emissions will occur, the
level of which varies depending on the inverter used (inverter type, interference
suppression features, manufacturer). To ensure compliance of the drive system
Selection
Start-up
Operation
Electromagnetic
compatibility
5 Installation at Site
Amarex KRT
29 of 78
Summary of Contents for Amarex KRT
Page 77: ......