6.2.1
Frequency of starts
CAUTION
Re-starting while motor is still running down
Damage to the submersible mixer!
▷
Do not re-start the submersible mixer before it has come to a standstill.
▷
Never start up a submersible mixer running in reverse rotation.
To prevent high temperature increases in the motor and excessive loads on the
motor, seal elements and bearings, the maximum number of start-ups shall not
exceed 10 per hour and 5000 per year. These values apply to mains start-up (DOL or
with star-delta contactor, autotransformer, soft starter). These limits do not apply to
frequency inverter operation.
6.2.2
Supply voltage
DANGER
Non-compliance with permissible supply voltage tolerances
Explosion hazard!
▷
Never operate an explosion-proof submersible mixer outside the specified
range.
The maximum permissible deviation in supply voltage is ±10% of the rated voltage.
The voltage difference between the individual phases must not exceed 1%.
6.2.3
Frequency inverter operation
DANGER
Operation outside the permitted frequency range
Explosion hazard!
▷
Never operate an explosion-proof submersible mixer outside the specified
range.
Frequency inverter operation of the submersible mixer is permitted in the frequency
range from 25 to 60 Hz.
6.2.4
Fluid properties
6.2.4.1
Minimum level of fluid handled
DANGER
Excessive temperatures due to dry-running
Explosion hazard!
▷
Always operate the submersible mixer in fully submerged condition only (incl.
propeller).
▷
Observe the minimum level of the fluid handled.
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).
6 Commissioning/Start-up/Shutdown
Amamix
25 of 54
