Control
27
© Lutz-Jesco GmbH 2020
Subject to technical changes.
200318
BA-10491-02-V01
Piston diaphragm dosing pump
MEMDOS KMS LB/LA
Operating instructions
10.7 Extended functions
The pump has two additional functions:
n
Cable break
n
Level monitoring
10.7.1 Cable break
The cable break function detects a damaged control cable. The external
current signal is not longer sent to the pump correctly.
In home position, the analogue input has a setting range of 0 – 20 mA.
The
0(4)–20mA key
alters the setting range to 4 – 20 mA. If the current
value of the incoming signal lies under 2 mA, the pump indicates a fault.
The Alarm LED and the
0(4) – 20 mA-LED illuminate.
i
The limit value was set to 2 mA, to avoid fluctuations in the er-
ror alarm current signal. The cable break function should be
displayed before a complete interruption of the signal; the
pump should stop.
Precondition for action:
ü
The pump assembly and installation have been completed success-
fully.
ü
Automatic operation was activated.
Perform the following working steps:
1.
Install the line in accordance with section 9.2.2 Connection socket 2“
on page 24.
2.
Press
0(4)–20mA
.
4
The 0(4) – 20 mA-LED illuminates.
3.
Press
Start
.
ü
The function cable break is activated.
10.7.2 Level monitoring
You can connect an external level switch to the pump. The level switch
monitors the filling level of a container with dosing medium. If the con-
tainer is empty, the level switch sends a signal to the pump. The pump
stops an the alarm and level LED illuminate.
Precondition for action:
ü
The assembly and installation of the pump and level switch have
been completed successfully.
Perform the following working steps:
1.
Install the level switch line in accordance with section 9.2.3 „Con-
nection socket 3“ on page 24.
2.
Press
Level
.
4
The level LED illuminates.
3.
Press
Start
.
ü
The function level monitoring is activated.
10.8 The status of the pump
The current status of the pump can be read off from the operating panel.
Illuminated LED
Reason
Explanation
The pump has
started.
The pump was started and
runs in the operating mode
selected.
(flashes)
The pump is in
Start / Stop mode.
If the pump is set in the
range 0 – 30 % the delivery
capacity of the pump is
altered via running and
pause times. It no longer
runs constantly.
(Flashes quickly)
No external
release any more.
The pump is stopped via the
external clearance signal.
(flashes)
The sensor LED
flashes
synchronously
with every stroke.
The strokes can be read off
from the sensor LED.
Tab. 27: The status of the pump
