Megging; High-Voltage Test; Technical Data - Grundfos UPED 50-12 Montage- Und Betriebsanleitung

Fault
Noise in the pump.
The green indicator light
is on.
Insufficient heat in some
places in the heating sys-
tem.
See also section 6.7 Indicator lights.
Note: The R100 can also be used for fault finding.

9. Megging

Megging of an installation incorporating an UPED
pump is not allowed, as the built-in electronics may
be damaged. If megging of the pump is necessary,
the pump should be electrically separated from the
installation.
The master and slave pumps must be megged sepa-
rately.
Megging of the pump can be carried out as
described below.
Megging of UPED pumps
1. Switch off the electricity supply.
2. Remove the wires from terminals L1, L2 and L3 and
the earth wire (see B).
3. Short-circuit terminals L1, L2 and L3 using two short
wires (see D).
4. Remove the wire for electronics frame connection
(see A).
5. Test between terminals L1/L2/L3 and earth (see C).
Maximum test voltage: 1500 VAC/DC.
Note: Never test between supply terminals (L1, L2 and
L3).
Maximum permissible leakage current: < 20 mA.
6. Fit the wire for electronics frame connection (see A).
7. Remove the short wires between terminals L1, L2 and
L3 (see D).
8. Fit the supply wires to terminals L1, L2 and L3 and
the earth wire (see B).
9. Switch on the electricity supply.

9.1 High-voltage test

If it is necessary to high-voltage test the UPED
pump, the megging instructions must be followed,
see section 9. Megging.
Cause
Air in the pump.
The inlet pressure is too low.
The flow is too low.
Remedy
Vent the pump.
Increase the inlet pressure and/or
check air volume in the expansion
tank (if installed).
Increase the head (setpoint) and/or
change over to constant pressure.
D

10. Technical data

Supply voltage
3 x 400-415 V ±10%, 50 Hz.
Motor protection
The pump requires no external motor protection.
Enclosure class
IP 42.
Relative air humidity
Maximum 95%.
Ambient temperature
0°C to +40°C.
A
B
C
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