External Start/Stop; Signal Relay - Grundfos MAGNA Serie Instrucciones De Instalación Y Funcionamiento

Temperature influence is suitable in:
• systems with variable flows (e.g. two-pipe heating
systems), in which the activation of the
temperature influence function will ensure a
further reduction of the pump performance in
periods with small heating demands and
consequently a reduced flow-pipe temperature.
• systems with almost constant flows (e.g. one-pipe
heating systems and underfloor heating systems),
in which variable heating demands cannot be
registered as changes in the head as is the case
with two-pipe heating systems. In such systems,
the pump performance can only be adjusted by
activating the temperature influence function.
Selection of T
max.
In systems with a dimensioned flow-pipe
temperature of:
• up to and including 55 °C, select T
• above 55 °C, select T
The temperature influence function
cannot be used in air-conditioning
Note
systems.

7.7 External start/stop

The pump can be started or stopped via an external
potential-free contact or a relay connected to
terminals 7 and 8, see section 5.2 Connection
diagram.
Functional diagram: Start/stop input
Start/stop input
H
H

7.8 Signal relay

The pump incorporates a signal relay, terminals
1, 2 and 3, for a potential-free fault and operating
signal. The function of the signal relay, fault signal
(factory setting), ready signal or operating signal, is
set with the R100.
The output, terminals 1, 2 and 3, is electrically
separated from the rest of the controller.
The signal relay is activated as follows:
• Fault signal
The signal relay is activated together with the red
indicator light on the pump, see section
8.2 Control panel.
• Ready signal
The signal relay is active when the pump is
running or has been set to stop, but is ready to
run, see section 8.2 Control panel.
• Operating signal
The signal relay is activated together with the
green indicator light on the pump, see section
8.2 Control panel.
16
= 50 °C,
max.
= 80 °C.
max.
Normal duty
Q
Stop
Q
Functions of signal relay
Signal relay Fault signal
Not activated:
• The electricity supply has been
switched off.
1 2 3
• The pump has not registered
NC NO C
a fault.
Activated:
• The pump has registered a fault.
1 2 3
NC NO C
Signal relay Ready signal
Not activated:
• The pump has registered a fault
1 2 3
and is unable to run.
NC NO C
Activated:
• The pump has been set to stop,
but is ready to run.
1 2 3
NC NO C
• The pump is running.
Signal relay Operating signal
Not activated:
• The pump has been set to stop.
• The pump has registered a fault
1 2 3
and is unable to run.
NC NO C
Activated:
• The pump is running.
• The pump has registered a fault,
1 2 3
NC NO C
but is able to run.
Resetting of fault indications
A fault indication can be reset in one of the following
ways:
• Briefly press , or
not influence the pump performance set.
• Briefly switch off the electricity supply to the
pump.
• With the R100, see section 8.4 R100 display
overview.
Before the pump can revert to normal duty, the fault
cause must be eliminated.
If the fault disappears by itself, the fault indication
will automatically be reset.
The fault cause will be stored in the pump alarm log.
The latest five faults can be called up with the R100.
on the pump. This will