6
INSTRUCTIONS FOR USE OM 651UC
3. CONNECTION
The supply lead for feeding the instrument should not be in the proximity of low-potential input signals.
Contactors, motors with larger input and other efficient elements should not be in the proximity of the instrument.
The lead into the instrument input (the measured quantity) should be in sufficient distance from all power leads and
appliances. Provided this cannot be secured, it is necessary to use shielded leads and connect correctly (only on
one side) to ground terminal GND (No.13) .
The instruments are tested in compliance with standards for use in industrial area, yet, we recommend to abide by
the above mentioned principles.
CONNECTION
Description
wiring
Input 1
input signal < 60 V
GND + Input 1
Input 2
input signal < 300 V
GND + Input 2
Resetting
input signal < 60 V
GND + Resetting
Function
Description
Control
Hold
Instrument blocking (display and outputs)
upon contact, terminal (No. 11/12)
Lock
Keyboard locking
upon contact, terminal (No. 11/12)
Grounding on terminal „E“ must be connected at
all times
1
2
3
-
E
N
L
+
PO
WER SUPPL
Y
A
O
/Ex
cit
ation
TxD
GND
RxD
Rx/Tx-
Rx/Tx+
GND
232
232
485
485
-
+
8
9 10
GND
Hold/Loc
k
INPUT 1
R
eset
-
+
+
GND
14 15 16
11 12 13
L2
L1
45
6
7
INPUT 2
+
