Non-Return Valve; Frost Protection; Electrical Connection; Supply Voltage - Grundfos MAGNA UPE 2000 Series Montage- Und Betriebsanleitung

3.3 Non-return valve

If a non-return valve is fitted in the pipe system, see
fig. 4, it must be ensured that the set minimum dis-
charge pressure of the pump is always higher than
the closing pressure of the valve. This is especially
important in proportional-pressure control mode
(reduced head at low flows).
Fig. 4

3.4 Frost protection

If the pump is not being used during periods of frost,
the necessary steps must be taken to prevent frost
bursts.

4. Electrical connection

The electrical connection and protection should be
carried out in accordance with local regulations.
Never make any connections in the pump
terminal box unless the electricity supply
has been switched off for at least 5 min-
utes.
The earth terminal of the pump must be
earthed.
The pump must be connected to an ex-
ternal mains switch with a contact sepa-
ration of at least 3 mm in each pole.
Earthing or neutralization can be used for
protection against indirect contact.
Megging must be carried out as de-
scribed in section 9. Megging.
If the pump is connected to an electric in-
stallation where an earth leakage circuit
breaker (ELCB) is used as additional pro-
tection, this circuit breaker must trip out
when earth fault currents with DC content
(pulsating DC) occur.
The earth leakage circuit breaker must
be marked with the symbol shown:
• The pump requires no external motor protection.
• The operating voltage and frequency are marked
on the pump nameplate. Please make sure that
the motor is suitable for the electricity supply on
which it will be used.
6
Open the terminal box cover as shown in fig. 5.
Fig. 5
!
"
If the terminal box cover cannot be lifted sufficiently,
it can be removed as shown in fig. 6.
Fig. 6
!
"

4.1 Supply voltage

1 x 230-240 V –10%/+6%, 50/60 Hz.