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6 Commissioning/Start-up/Shutdown
6.1.2 Checking the direction of rotation
CAUTION
Wrong direction of rotation
Damage to the motor!
▷ Do not run the pump set for more than two minutes when checking the
direction of rotation.
CAUTION
Uncontrolled backflow of the fluid from the riser
Damage to the pump set!
▷ Prevent any uncontrolled backflow of the fluid handled with suitable means.
▷ Control the fluid backflow, e.g. by throttling the gate valve in the discharge
line.
For single-phase a.c. units the direction of rotation is fixed and cannot be changed.
For three-phase units, check the direction of rotation as described below:
✓ The back-up name plate is attached at the place of installation of the
submersible borehole pump.
✓ The pump set has been installed completely and is sufficiently covered by the
fluid to be handled.(⇨ Section 6.2.6.1 Page 30)
✓ The power supply cable and the measuring and control cables, if any, are
connected to the control cabinet.
✓ The shut-off valve in the discharge line has been closed.
Switch on the motor at the control cabinet. (⇨ Section 6.1.1 Page 28)
1.
2.
Read the pressure on the pressure gauge.
3.
Switch off the motor and interchange two phases of the connection cable in the
control cabinet.
4.
Start up the motor and read the pressure at the pressure gauge.
5.
Switch off the motor.
⇨ The higher reading at the pressure gauge indicates the correct direction of
rotation.
⇨ On pumps with free discharge, the correct direction of rotation is indicated
by the greater water volume produced, in fountains by the higher jet.
6.
Wire the motor for the correct result.
6.2 Operating limits
6.2.1 Switching frequency
To prevent inadmissible heat build-up in the motor, the following max. number of
start-ups or minimum standstill periods must be complied with:
▪ 20 start-ups per hour
▪ Minimum standstill periods of three minutes
6.2.2 Supply voltage
Observe the permissible voltage and frequency fluctuations to DIN EN 60034-1
section A; U
± 5 %, f
± 2 %. The limits may differ if specified in the order, see order
N
N
confirmation.
Star point displacement
Operation with displaced start point must not exceed the value U
must be limited to one operating hour.
S 100D; UPA 100C
> 0.2 x U
and
0
N
29 of 42
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