Commissioning Hardware PolyGard
®
DGC- 05
Page 17
PolyGard
is
a
registered
trademark
of
MSR
GAINBDGC05_E_1206
Phone.:
0049(0)8531/9004-0
Fax:
0049(0)8531/9004-54
Specification subject to change without notice.
MSR-Electronic GmbH, Würdinger Str. 27, D 94060 Pocking
www.msr-electronic.de
Made in Germany
5.3
Check voltage and bus polarity of the field bus
•
Plug-in transmitter boards of DT- 05 and AT 34XX.
•
Switch-on operating voltage at the DGC- 05 central control.
•
Check operating voltage and bus polarity at each DT- 05.
U min = 15 VDC!
•
Bus polarity:
Measure tension BUS_A against GND and BUS_B against GND.
U BUS_A ca. 0,5 V > U BUS_B
U BUS = ca. 2 – 4 VDC (depending on the number of DT-05 and on the cable length)
Fig. 16 Measurement of field bus
1
1
1
1
1
1
X4
DT-05
X4
DT-05
X4
DT-05
X4
DT-05
2
2
2
2
2
2
3
4
5
7
6
6
6
6
6
6
8
7
7
7
7
7
+ 24V
0 V
BUS_A
BUS_B
+ 24 V
0 V
V
(DC)
V
(DC)
V
(DC)
U min =
15 VDC
+
+
+
DGC-05
central control
560 R
