User Guide

English (US)
36
8.11.2 Relay outputs
See fig. 40, pos. 1.
The pump has two signal relays with a potential-free changeover
contact for external fault indication.
You can set the function of the signal relay to "Alarm", "Ready" or
"Operation" on the operating panel or with Grundfos GO.
The relays can be used for outputs up to 250 V and 2 A.
Fig. 46 Relay output
The functions of the signal relays appear from the table below:
Factory settings of relays:
Relay output in twin-head pumps
The relay output for both the "Alarm", "Ready" and "Operation"
functions operates independently on each pump head. If, for
example, a fault occurs in one of the pumps, its respective relay
is triggered.
Warnings do not activate the alarm relay.
Use C and NC for fault signals as this enables serial
connections of more relays and detection of signal
cable defects.
TM05 3338 1212
Contact symbol Function
NC Normally closed
NO Normally open
C Common
NC NO C NC NO C
Operation
Alarm
Relay 1 Relay 2
Signal relay Alarm signal
Not activated:
• The power supply has been switched off.
• The pump has not registered a fault.
Activated:
• The pump has registered a fault.
Signal relay Ready signal
Not activated:
• The pump has registered a fault and is
unable to run.
• The power supply has been switched off.
Activated:
• The pump has been set to stop, but is ready
to run.
• The pump is running.
Signal relay Operating signal
Not activated:
• The power supply has been switched off.
Activated:
• The pump is running.
Relay Function
1 Operating signal
2 Alarm signal
132
NC NO C
132
NC NO C
12 3
NC NO C
132
NC NO C
132
NC NO C
12 3
NC NO C
132
NC NO C
132
NC NO C
12 3
NC NO C