Grundfos PM 1 Data Booklet

9
Grundfos Pressure Manager
Functions
PM 1
The functions of the PM 1 are described below:
Anti-cycling
If there is a minor leakage in the system, or a tap has
not been entirely closed, the PM 1 will start and stop the
pump periodically. In order to avoid cycling, the anti-
cycling function of the PM 1 will stop the pump and
indicate an alarm.
Dry-running protection
The PM 1 incorporates dry-running protection that
automatically stops the pump in case of dry running.
The dry-running protection functions differently during
priming and operation.
Note: If a dry-running alarm has been activated, the
cause should be found before the pump is restarted in
order to prevent damage to the pump.
Dry running during priming
If the PM 1 detects no pressure and no flow within
5 minutes after it has been connected to a power supply
and the pump has started, the dry-running alarm is
activated. This allows the pump to self-prime.
Dry running during operation
If the PM 1 detects no pressure and no flow within
40 seconds during normal operation, the dry-running
alarm is activated.
PM 2
The PM 2 has the same functions as the PM 1, but
the PM 2 has some additional functions which can be
enabled and disabled with DIP switches located behind
the control panel.
Auto-reset
When the auto-reset function is enabled, cycling and
dry-running alarms will be automatically reset.
Note: The auto-reset function should NOT be enabled
on pumps which cannot self-prime when water returns
after dry-running.
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 the PM 2 has been set to start/stop according to
water consumption (default), cycling may occur in the
following situations:
• In case of a minor leakage.
• If a tap has not been entirely closed.
When the PM 2 has been set to start/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.
Note: 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.
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.
The purpose of this function is to avoid unnecessary
water and current consumption, e.g. in case of pipe
fracture or considerable leakages.
Note: 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