Indicator Lights And Signal Relay; Megging - Grundfos CRE Instrucciones De Instalación Y Funcionamiento

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