CAUTION
Danger of frost/freezing
Damage to the pump set!
▷
Drain the pump set or protect it against freezing.
Refer to the maximum permissible fluid and ambient temperature on the name plate
and in the data sheet.
6.2.2 Frequency of starts
CAUTION
Excessive frequency of starts
Damage to the motor!
▷
Never exceed the specified frequency of starts.
To prevent high temperature increases in the motor and excessive loads on the
motor, seal elements and bearings, the frequency of starts shall not exceed the
number of starts per hour given below and a total number of 5,000 starts per year.
Table 14: Frequency of starts
Motor rating [kW]
Maximum No. of starts
[Starts/hour]
≤ 7.5
30
> 7.5
10
These values apply to mains start-up (direct or with star-delta contactor,
autotransformer, soft starter). The limit does not apply to frequency inverter
operation.
CAUTION
Re-starting while motor is still running down
Damage to the pump set!
▷
Do not re-start the pump set before it has come to a standstill.
▷
Never start up the pump set while the pump is running in reverse.
6.2.3 Minimum fluid level
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.
The pump set is designed for continuously submerged operation. This condition has
to be fulfilled for the motor to be cooled sufficiently.
The pump is ready for operation as soon as the motor is fully submerged (dimension
A). Exact dimensions see general arrangement drawing/outline drawing.
The pump can be operated at a lower fluid level for short periods.
If the motor is not sufficiently cooled, an internal temperature monitoring device will
trip the pump set and automatically re-start it after the motor has cooled down. The
fluid level must not drop below the specified minimum (dimension B). Exact
dimensions see general arrangement drawing/outline drawing.
Ready for operation
6 Commissioning/Start-up/Shutdown
Amarex KRT
33 of 74
Goodnal STP ST041 Sewage Delivery (Amarex KRT Submersible Motor Pump) Vendor Manual
Q-Pulse Id VM362
Active 29/10/2013
Page 35 of 96
