2.
Set the overload protection device to the rated current specified on the name
plate.
5.4.1.2
Level switch
DANGER
Dry-running of submersible mixer
Explosion hazard!
▷
Never allow an explosion-proof submersible mixer to run dry.
CAUTION
Propeller not fully submerged
Damage to the submersible mixer!
▷
Never allow the liquid level to drop below the submersible mixer during mixer
operation (not even for short periods).
Automatic mixer operation in a tank requires the use of level control equipment.
Observe the specified minimum fluid level.
5.4.1.3
Frequency inverter operation
The submersible mixer is suitable for frequency inverter operation as per IEC
60034-17.
DANGER
Operation outside the permitted frequency range
Explosion hazard!
▷
Never operate an explosion-proof submersible mixer outside the specified
range.
DANGER
Incorrect setting of frequency inverter current limit
Explosion hazard!
▷
Set the current limit to maximum 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 submersible mixer, particularly the rated current
Observe the following limits when operating the submersible mixer via frequency
inverter:
▪
Only utilize up to 95 % of the motor power rating P
2
indicated on the name
plate.
▪
Frequency range 25-60 Hz
Frequency inverter operation produces RFI 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 mixer with shielded power cables.
The submersible mixer 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 mixer.
Suitable analyzing devices must be selected. This applies in particular to the leakage
sensor inside the motor.
Selection
Operation
Electromagnetic
compatibility
Interference immunity
5 Installation at Site
18 of 54
Amamix
