Taking The Product Out Of Operation; Emergency Operation (Only 20-30 Hp) - Grundfos CRE Instructions Manual

7. Taking the product out of operation

7.1 Emergency operation (only 20-30 hp)

DANGER
Electric Shock
Death or serious personal injury
‐
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.
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 the figure below.
U V W
LJ
L 2
L3
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.
U V W
U L
L J
V L
L2
W L
L
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