Grundfos PM 1 User Manual

English (GB)
12
10.2 Dry-running protection
The pressure manager incorporates dry-running
protection that automatically stops the pump in case
of dry running.
The dry-running protection functions differently
during priming and operation.
10.2.1 Dry running during priming
If the pressure manager detects no pressure and no
flow for five minutes after it has been connected to a
power supply and the pump has started, the dry-
running alarm will be activated.
10.2.2 Dry running during operation
If the pressure manager detects no pressure and no
flow for 40 seconds during normal operation, the dry-
running alarm will be activated.
10.2.3 Resetting of dry-running alarm
If a dry-running alarm has been activated, the pump
can be restarted manually by pressing [Reset]. If the
pressure manager detects no pressure and no flow
for 40 seconds after restarting, the dry-running alarm
will be re-activated.
11. Functions, PM 2
11.1 Auto reset
When the auto-reset function is enabled, cycling and
dry-running alarms will be reset automatically.
To enable the function, set DIP switch 6 to "ON". See
section 4.2.1 DIP switches, PM 2.
11.2 Anti cycling
To avoid inadvertent starts and stops of the pump in
case of a failure in the installation, the anti-cycling
function can be enabled.
The function will detect cycling if it occurs and stop
the pump with an alarm.
When PM 2 has been set to start and stop according
to water consumption, cycling may occur in the
following situations:
• In case of a minor leakage.
• If a tap has not been closed completely.
When PM 2 has been set to start and stop with 1 bar
differential pressure, cycling may occur in the
following situations:
• If the pressure tank has lost its precharge
pressure.
• If the size of the pressure tank is insufficient.
If the cycling alarm has been activated, the pump
can be restarted manually by pressing [Reset].
When the auto-reset function is enabled, the pump
will be restarted automatically after 12 hours in alarm
condition.
To enable the function, set DIP switch 7 to "ON". See
section 4.2.1 DIP switches, PM 2.
11.3 Maximum continuous operating time,
30 minutes
When this function is enabled, the pump will be
stopped when the pump has been running
continuously for 30 minutes.
Restart the pump by pressing [Reset].
The purpose of this function is to avoid unnecessary
water and current consumption, e.g. in case of pipe
burst or considerable leakages.
To enable the function, set DIP switch 8 to "ON". See
section 4.2.1 DIP switches, PM 2.
If the dry-running alarm has been
activated, the cause must be found before
the pump is restarted in order to prevent
damage to the pump.
The auto-reset function must not be
enabled on pumps which cannot self prime
when water returns after dry running.
In case of a very small consumption, the
anti-cycling function may register this as a
minor leakage and stop the pump
inadvertently. If this occurs, the function
can be disabled.
When the function is enabled, any
consumption exceeding 30 minutes will
cause an alarm, and the pump will be
stopped.
If enabled, the auto-reset function will not
restart the pump.

Grundfos PM 1 Specifications

General

Brand	Grundfos
Model	PM 1
Category	Controller
Language	English