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/h and 5000/a. These values apply to mains start-up (DOL or with star-delta
contactor, autotransformer, soft starter). The limit does not apply to frequency
inverter operation.
6.2.2 Fluid properties
CAUTION
Layers of floating sludge in biogas plants
Damage to the submersible mixer!
▷
Never use the submersible mixer Amaprop 2500 for breaking up layers of
floating sludge in biogas plants.
NOTE
Deposits accumulating on the housing surface entail the risk of insufficient cooling of the
submersible mixer. We recommend to check the housing surface regularly and remove
severe dirt deposits.
6.2.2.1 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).
The submersible mixer is operational when the fluid level is not lower than
dimension W
T
. This minimum level of the fluid handled must also be ensured during
automatic operation.
6 Commissioning/Start-up/Shutdown
Amaprop®
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Goodnal STP ST041 Biological Treatment (KSB Amaprop Installation and Operating Manual) Vendor Manual
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