Start/Stop Of Pump; Priming/Venting Of Pump; Level Control; Indicator Lights And Alarm Output - Grundfos DME 12 Montage- Und Betriebsanleitung

4.2 Start/stop of pump

The pump can be started/stopped in two different
ways:
• Locally on the pump control panel.
• By means of an external on/off switch connected
to the pulse input. See connection overview in
section 3.6.

4.3 Priming/venting of pump

The pump control panel incorporates a
Press this button if the maximum pump capacity is
required over a short period, e.g. during start-up.
When the button is released, the pump automatically
returns to the previous operating mode.
During priming/venting, it is recommended to let the
pump run without a counter pressure or to loosen the
vent valve by giving it a 1/8 to 1/4 turn.
Note: When the buttons
multaneously, the pump can be set to run for a spe-
cific number of seconds at maximum capacity. The
remaining number of seconds will appear in the dis-
play. The maximum value is 300 seconds.

4.4 Level control

The pump can be fitted with a level control unit for
monitoring of the chemical level in the tank.
The pump can react to two level signals. The pump
will react differently, depending on the influence on
the individual level sensors.
Level sensors Pump reaction
• Red indicator light is on.
Upper sensor
activated • Pump running.
(closed contact)
• Alarm relay activated.*
• Red indicator light is on.
Lower sensor
activated • Pump stopped.
(closed contact)
• Alarm relay activated.*
* Control variant "AR" only.
See section 3.6 for connection of the level control
unit and alarm output.

4.5 Indicator lights and alarm output

The green and red indicator lights on the pump are
used for operating and fault indication.
In control variant "AR", the pump can activate an ex-
ternal alarm signal by means of a built-in alarm relay.
The alarm signal is activated by means of an internal
potential-free contact.
button.
100%
and are pressed si-
100%
The functions of the indicator lights and the built-in
alarm relay appear from the table below:
Green Red
Condition
LED LED
Pump
On
running
Flash-
Set to stop
ing
Pump fault Off
Supply
Off
failure
Pump run-
ning, low
On
chemical
2
level
Empty
Off
2
tank
Analog
signal Off
< 2 mA
The dosed
quantity is
too small
according
On
to the sig-
nal from the
dosing
3
monitor
Overheat-
Off
ing
1
Control variant AR only.
2
Requires connection to level sensors.
3
Requires activation of the dosing monitoring
function and connection to a dosing monitor.
Alarm
Dis-
play
output
Normal
Off
indication
1 2 3
NC NO C
Normal
Off
indication
1 2 3
NC NO C
On EEPROM
1 2 3
NC NO C
Off Off
1 2 3
NC NO C
Normal
On
indication
1 2 3
NC NO C
Normal
On
indication
1 2 3
NC NO C
Normal
On
indication
1 2 3
NC NO C
Normal
On
indication
1 2 3
NC NO C
MAX.
On
TEMP.
1 2 3
NC NO C
1
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