Emergency Operation (Only 15-30 Hp) - Grundfos LFE Instrucciones De Instalación Y Funcionamiento

25. Emergency operation (only 15-30 hp)

DANGER
Electric shock
Death or serious personal injury
- Disconnect all electric supply circuits and ensure
these have been switched off for at least 5 minutes
before making any connections in the pump
terminal box. For instance, 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
variable frequency drive. If this is the case it is possible to
maintain emergency operation of the pump.
Before change over to emergency operation we recommend that
you:
• 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 variable
frequency drive 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).
All manuals and user guides at all-guides.com
2. Disconnect the motor supply leads, U/W1, V/U1, W/V1, from
3. Connect the leads as shown in fig. 47.
Use the screws from the power supply terminals and the nuts
from the motor terminals.
the terminal box.
Fig. 47 How to switch an E-pump from normal operation to
emergency operation
49