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
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.
D
W
T
h
1
h
2
Fig. 7: Minimum level of fluid handled
Table 6: Minimum level of fluid handled
Ø D
[mm]
h
1 min
[m]
h
2 min
[m]
W
T min
[m]
200
0,12
0,50
0,82
300
0,15
0,80
1,25
400
0,20
0,85
1,45
600
0,30
1,00
1,90
6 Commissioning/Start-up/Shutdown
24 of 52
Amamix® direkt
Goodnal STP ST041 Biological Treatment (KSB Amamix Direct Installation and Operation Manual) Vendor Manual
Q-Pulse Id VM385
Active 29/10/2013
Page 24 of 52
