Start-Up; Operation; Normal Operation; Power Supply Failure - Grundfos PM 1 Manual De Instrucciones

6. Start-up

1. Open a tap in the system.
2. Switch on the power supply.
3. Check that the "Power on", "Pump on" and
"Alarm" indicator lights illuminate briefly.
– The pump is running, and a pressure will be
built up in the system.
4. Close the tap.
5. Check that the pump stops after a few seconds
and that the "Pump on" indicator light goes out.
The system is now ready for operation.
If a pressure is not built up in the system
within 5 minutes after start-up, the dry-
running protection will be activated, and
Note the pump is stopped. Check the priming
conditions of the pump before attempting
to restart the pump.
Restart the pump by pressing [Reset].
If the pump restarts immediately after
it has been stopped, the isolating valve
used for checking for correct operation is
positioned too close to the PM unit.
A possible isolating valve installed
immediately after the PM outlet must not
Note
be used for checking for correct operation.
The problem will be that the pipe length
between the PM unit and the isolating
valve is too short, and therefore the
expansion of the pipe is too small. The
result is that the pressure will drop rapidly
when the pump stops.
8

7. Operation

7.1 Normal operation

When water is consumed in the water supply system,
the PM 1 starts the pump when the starting
conditions of the unit are fulfilled. This happens for
example when a tap is opened which makes the
pressure in the system drop. The unit stops the
pump again when consumption stops, i.e. when the
tap is closed.
7.1.1 Starting and stopping conditions
Starting conditions
The unit starts the pump when at least one of the
following conditions is fulfilled:
• The flow is higher than Q
• The pressure is lower than p
Stopping conditions
The unit stops the pump with a time delay of
10 seconds when the following conditions are both
fulfilled:
• The flow is lower than Q
• The pressure is higher than p
The p , p and Q
start stop min.
section 11. Technical data.

7.2 Power supply failure

In case of a power supply failure, the pump restarts
automatically when power returns and runs for at
least 10 seconds.
The setting of the anti-cycling function will not be
affected by a power supply failure.
.
min.
.
start
.
min.
.
stop
values are shown in