Grundfos TPE 2000 Series, Installation And Operating Instructions Manual

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English (GB)
29
17. Insulation resistance
18. Emergency operation (only 11-22 kW)
If the pump has stopped and it does not restart after you have
gone through normal remedies, the reason could be a faulty
frequency converter. If this is the case, it is possible to establish
emergency operation of the pump.
But before you change to emergency operation, we recommend
you to check these points:
• Check that the mains supply is OK.
• Check that control signals are working (start/stop signals).
• Check that all alarms have been reset.
• Make a resistance test on the motor windings (disconnect the
motor conductors from the terminal box).
If the pump still does not start, the frequency converter is faulty.
To establish emergency operation, proceed as follows:
1. Disconnect the three mains conductors, L1, L2, L3, from the
terminal box, but leave the protective earth conductor(s) in
position on the PE terminal(s).
Fig. 43 Disconnecting the mains conductors
2. Disconnect the motor supply conductors, U/W1, V/U1, W/V1,
from the terminal box.
Fig. 44 Disconnecting the motor supply conductors
3. Connect the conductors as shown in fig. 45 .
Fig. 45 How to switch an E-pump from normal operation to
emergency operation
Use the screws from the mains terminals and the nuts from the
motor terminals.
Fig. 46 Connecting the conductors
Caution
Up to 7.5 kW
Do not measure the insulation resistance of motor
windings or an installation incorporating E-pumps
using high voltage megging equipment, as this may
damage the built-in electronics.
Caution
11-22 kW
Do not measure the insulation resistance of an
installation incorporating E-pumps using high voltage
megging equipment, as this may damage the built-in
electronics.
The motor conductors can be disconnected
separately and the insulation resistance of the motor
windings can be tested.
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 mains supply is disconnected.
TM
03 860
7 200
7
TM
0
3
9
120
3
407
TM
04
00
18
48
07
TM
03
91
21
34
07