Xylem 712 PUMP CONTROLLER - Manual (Page 2)

3 M712GB0505
CONTROLLER 712
MJK Automation A/S
Byageren 7
DK-2850 Nærum
Denmark
[email protected]
www.mjk.com
4 M712GB0505
CONTROLLER 712
MJK Automation A/S
Byageren 7
DK-2850 Nærum
Denmark
Tel.: +45 45 56 06 56
Fax: +45 45 56 06 56
Electrical connection
L N
Pump 1
Pump 2
Stop level
Start level pump 1
Start level pump 2
Max. level alarm
Q1 Q2
Auxiliary switches
on thermal
overload relay
activates the alarm
output on overload
trip.
K1 K2 Alarm
А
Б
В
Г
Function
Relay no. 1 is activated when the level in the well has reached
the first start electrode
Á, which will start pump no. 1. The
pump will be stopped again when the stop electrode
À goes
free of the level surface OR when the preset running time has
exeeded.
Relay no. 2 will be activated if the level continues to rise and the
level reaches the second start elektrode
Â, which will start pump
no. 2. (Note: BOTH pumps will be started if pump no. 1 in the
meantime has been stopped because of runout of the preset
running time.)
The pump(s) will be stopped when the stop electrode
À goes
free of the level surface.
Alarm output
The alarm output is equipped with a timer which is set by means
of the potmeter 'DELAY' on the front panel. This means that an
alarm condition will not activate the alarm relay before runout of
the preset delay time.
The following situations will activate the alarm:
1: When a pump has been in uninterrupted service during a
period beyond the preset maximum running time.
(The pump will also be stopped.)
2: When the alarm electrode Ãÿreaches the liquid surface.
(The pumps are kept running until the preset maximum
running time is reached.)
The alarm is deactivated when the stop electrode
À goes free of
the level surface.
Function with short-circuited electrodes
Electrode controls are sensitive to smudging and short-circuiting
of the electrodes, and a piece of wet paper will typically short-
circuit the stop electrode to the ground electrode.
ConTroller 712 will therefore run the pumps on the preset
running time if the electrodes are smudged or short-circuited.
Status outputs
ConTroller 712 is equipped with status outputs for transmission
of service and alarm status to MJK GSM/GPRS-COM for
communication to i.e. a SCADA system.
Ground connection in well