FU25201a_e_A5 / Nov-07
Page 7 / 33
3.
Terminal Assignments and Connections
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.
Under nominal conditions the current consumption of the unit is approx. 70 mA (aux. output
unloaded, see technical specifications) Lower input voltage and load of the aux. output will
increase the consumption accordingly.
1
2
3
4
5
6
7
8
9
1
0
1
1
1
2
Voltage / -10V
TTL: input / B HTL: n.c.
TTL: input B HTL: input B
GND ( - ) for analogue signals
18...30 VDC
(typ. 70 mA)
Current output 0-20mA / 4-20mA
TTL: input / A HTL: n.c.
TTL: input A HTL: input A
Control
Aux. output 5.5V
(max. 250 mA)
GND ( - )
GND ( - )
FU 252
3.1.
Example for use of TTL encoders
If applicable, the encoder can be supplied from the FU252 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
FU 252
Screen
A
A
B
B
A
A
B
B
8
9
2
3
11 (+5.5V)
12 (GND)
+
-
Screen
A
A
B
B
A
A
B
B
TTL encoder
FU 252
