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English (US)
27. Emergency operation (only 15-30 hp)
If the pump is stopped and you cannot start the pump
immediately after normal remedies, the reason could be a faulty
frequency converter. If this is the case it is possible to maintain
emergency operation of the pump.
Before change over to emergency operation we recommend you
to:
• check that the power supply is OK
• check that control signals are working (start/stop signals)
• check that all alarms are reset
• make a resistance test on the motor windings (disconnect the
motor leads from the terminal box).
If the pump remains stopped it is possible that the frequency
converter is faulty.
To establish emergency operation proceed as follows:
1. Disconnect the three power supply leads, L1, L2, L3, from the
terminal box, but leave the protective ground lead(s) in
position on the PE terminal(s).
2. Disconnect the motor supply leads, U/W1, V/U1, W/V1, from
the terminal box.
3. Connect the leads as shown in fig.
43
.
Fig. 43
How to switch an E-pump from normal operation to
emergency operation
Use the screws from the power supply terminals and the nuts
from the motor terminals.
4. Insulate the three leads from each other by means of
insulating tape or the like.
5. A motor starter is required.
Warning
Never make any connections in the pump
terminal box unless all electric supply circuits
have been switched off for at least 5 minutes.
Note for instance that the signal relay may be
connected to an external supply which is still
connected when the power supply is
disconnected.
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Warning
Do not bypass the frequency converter by
connecting the power supply leads to the U, V
and W terminals.
This may cause hazardous situations for
personnel as the high voltage potential of the
power supply may be transferred to touchable
components in the terminal box.
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Check the direction of rotation when starting up
after switching to emergency operation.
Summary of Contents for VLSE
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