Electrical installation
24
© Lutz-Jesco GmbH 2020
BA-10491-02-V01
Piston diaphragm dosing pump
MEMDOS KMS LB/LA
Operating instructions
9.2.2 Connection socket 2
9.2.2.1 Analogue input
The analogue input makes it possible to control the delivery capacity by
means of a 0/4 – 20 mA signal.
The delivery capacity is regulated via the stroke frequency.
n
0/4 - 20 mA signal
n
Tolerance ± 2 %
n
Working resistance: 500 ohms
Pin
M12x1
(A-coded)
Assignments
Connection Cable colour*
2
(+) 0/4 – 20 mA
3
2
White
WH
3
Analogue (GND)
Blue
BU
Tab. 23: Analogue input
* Applies to cable colours from Lutz-Jesco GmbH. No liability is accepted
for cables from other manufacturers.
9.2.2.2 Analogue output
The dosing pump relays an analogue signal via the analogue output; its
current value behaves in proportion to the delivery capacity set. With 0 %
delivery capacity, 0 mA or 4 mA is registered. With 100 % delivery capac-
ity, the output signal amounts to 20 mA.
n
0/4 – 20 mA signal
n
Tolerance ± 2 %
Pin
M12x1
(A-coded)
Assignments
Connection Cable colour*
1
0/4 – 20 mA
4
1
Brown
BN
4
Analogue (GND)
Black
BK
Tab. 24: Analogue output
* Applies to cable colours from Lutz-Jesco GmbH. No liability is accepted
for cables from other manufacturers.
9.2.3 Connection socket 3
9.2.3.1 Level input
The dosing pump can be connected with an external level contact (e.g. a
suction line with a level switch) via the level input. The contact is open
when not switched. 24 V DC are always applied to pin 3. If the float falls
with a falling level, a contact is switched and the pump comes to a stand-
still. The alarm relay is also switched and the level and alarm LEDs illumi-
nate.
n
Closer NO
n
I
max
(with 24 V) = 3 mA
n
Switching level high > 15 V DC
Pin
M12x1
(A-coded)
Assignments
Connection
Cable colour*
2
DIG IN 2
IN
24 V
White
WH
3
24 V OUT
Blue
BU
Tab. 25: Level input
* Applies to cable colours from Lutz-Jesco GmbH. No liability is accepted
for cables from other manufacturers.
9.2.4 Connection socket 4
9.2.4.1 Alarm relay output
Faults of the dosing pump can be outputted via the alarm relay. An alarm
LED lights up as soon as a fault is registered. The LED begins to flash
once the fault has been remedied and the error can be cleared.
n
potential-free
n
With an ohmic resistive load: max. 230 V AC, 2.5 A / max. 30 V DC, 2.5
A
Possible faults:
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Level switch (empty notification)
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Stroke sensor
n
Cable break
n
Motor overload
n
Damage to motor
n
Drive defective
Pin
M12x1
(B-coded)
Assignments
Connection Cable colour*
1
Break (NC)
contact
1
2
4
Brown
BN
2
Make (NO)
contact
White
WH
3
-
Blue
BU
4
Changeover
contact
Black
BK
Tab. 26: Alarm relay output
* Applies to cable colours from Lutz-Jesco GmbH. No liability is accepted
for cables from other manufacturers.
