Diaphragm Metering Pump MEMDOS E / DX
BW 1 04 02 / 5
Lutz-Jesco GmbH
Improved changes are always reserved without notice.
7. MEMDOS DX control unit
Operating panel
The operating panel has two green LEDs for
operation and external control, one red LED for
alarm, one 3-digit multifunctional display and four
keys for settings. The inputs for remote switchoff,
low level indication and external control are located
below the display.
0/4..20mA control signal: It is possible to choose
between a 0...20 mA or 4...20 mA standard signal
(display
0.20 or 4.20 ). After releasing the Mode key,
the stroke frequency corresponding to the current
appears in the display. The Extern LED is on. If the
current exceeds 20 mA (display OVL) or decreases
below 4mA in the range of 4...20 mA (display E-I ),
the Alarm LED lights up, the alarm relay is actuated
and the pump stops.
Alarm
The pump allows to control the metering process.
An alarm is indicated visually in the display and
forwarded by the warning alarm relay.
Low level alarm signaling: The Alarm LED blinks
and the alarm relay is actuated. The display shows
E-L.
Low level main alarm: The Alarm LED is on and
the alarm relay is actuated. The pump stops. The
display shows E-L.
Internal error: The pump carries out a self-check
which switches off the pump, if no stroke has been
carried out two seconds after startup of motor (e.g.
in the case of excessively high backpressure) or if
the stroke sensor does not work (display E-2). The
alarm is reset by removing the mains plug. In
addition, it is possible to connect a diapragm failure
sensor (display E-H) and a metering monitoring unit
(display E-F).
Factory setting
These settings should only be made if the electronic
unit is replaced.
Max. number of strokes: Keep the keys Mode and
I/0 pressed while applying voltage and set the
maximum number of pump strokes using keys
and . After releasing the Mode key, normal
operation starts.
Alarm relay: If the keys Mode and are pressed
while applying voltage (display RE0), the relay is
currentless in the case of error and OFF, when
pressing the keys Mode and , the relay pulls up in
the case of error (display rE1).
Remote switchoff External control
Low level indication
Switchon / off
The pump is switched on / off using the I/0 key.
While disconnected the display shows OFF. By
opening the contact for remote switchoff the pump
is also turned off. The Extern LED is on.
Operating modes
To select the operating mode, press the Mode key.
The display shows the designation of an operating
mode which can be changed using keys and .
Internal operation: int appears in the display, and
after releasing the Mode key, the set stroke
frequency is shown. The latter can be modified
using keys and . The value is changed at an
increasing speed with the key pressed.
External control: The display shows the multiplier
1. 1..1.64 or the divisor 2.1..64.1. After releasing the
Mode key, the number of strokes still to be carried
out is indicated in the case of multiplication
operation. In the case of division operation, the
number of received input pulses is shown. The
Extern LED is on.
