ZU25102A_e.DOC / Mrz-08
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3.
Terminal Assignment
We recommend connecting the Minus wire of the power supply to earth potential.
Please observe that, under poor earthing and grounding conditions, multiple earth connections
of screens and GND terminals may cause severe problems. In such cases it may be better to
have only one central earthing point for the whole system.
GND terminals 4, 6 and 12 are connected internally. Depending on input voltage and load of the
auxiliary voltage output, the total power consumption of the unit is approx. 150 mA
(see specifications).
1
2
3
4
5
6
7
8
9
1
0
1
1
1
2
Analogue out +/-10V
TTL: Input /B HTL: n.c.
TTL: Input B HTL: Input B
Analogue GND ( - )
+18...30 VDC (typ. 200 mA)
GND ( - )
0-20mA / 4-20mA out
TTL: Input /A HTL: n.c.
TTL: Input A HTL: Input A
Reset
Aux. 5.5V out (max. 150 mA)
GND ( - )
P
O
W
E
R
3.1.
Incremental encoders TTL / RS 422
If applicable, the encoder can be supplied from the ZU251 converter. Where the encoder is
already supplied from a remote source, we recommend fully differential operation, with no
GND connection between encoder and converter (see figures a. and b.)
8
9
2
3
11 (+5.5V)
12 (GND)
+
-
TTL encoder
ZU 251 converter
Screen
A
A
B
B
A
A
B
B
a)
8
9
2
3
11 (+5.5V)
12 (GND)
+
-
TTL encoder
ZU 251 converter
Screen
A
A
B
B
A
A
B
B
b)
+ext
-ext
