Indicator Lights And Signal Relay; Megging - Grundfos CRE Montage- Und Betriebsanleitung

4. Indicator lights and signal relay

The operating condition of the pump is indicated by the green and
red indicator lights in the pump terminal box, fig. 6.
Fig. 6
Green
Red
Indicator lights
Fault Operation
(red) (green)
Off Off
Off Permanently on
Off Flashing
Permanently on Off
Permanently on Permanently on
Permanently on Flashing
In case of a fault indication, the cause may be one of the fol-
lowing:
• Too high motor temperature
• Undervoltage
• Overvoltage
• Too many restarts (after faults)
• Overload
• Dry running
• Other fault
A fault indication can be reset in one of the following ways:
• By briefly opening the connection between terminals 2 and 3
(stops the pump).
• By briefly switching off the electricity supply to the pump.
6
The pump incorporates an output for a potential-free signal via an
internal relay.
The functions of the two indicator lights and the signal relay are
as shown in the following table:
Contact position of
signal relay
The electricity supply has been switched off.
NO NC
C
The pump is operating.
C NO NC C NO NC
The pump has been set to stop.
C NO NC
The pump has stopped because of a fault. Restarting will be at-
tempted (it may be necessary to restart the pump by resetting the
fault indication).
C NO NC
The pump is operating, but it has been stopped because of a
fault.
C NO NC
The pump has been set to stop, but it has been stopped because
of a fault.
C NO NC

5. Megging

Note: Megging of an installation incorporating E-pumps is not al-
lowed, as the built-in electronics may be damaged.
Description