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SCU 123
6
Troubleshooting
VBus
®
terminals
sensor terminals
ground
terminals
Operating control lamp flashes red. On the display the
symbols
and
appear.
Sensor defect. An error code instead of
a temperature is displayed in the sensor
display channel.
888.8
Cable broken.
Check cable.
Disconnected Pt1000 temperature sen-
sors can be checked with an ohmmeter. In
the following table, the resistance values
with the corresponding temperatures are
shown.
°C
°F
Ω
-10
14
961
-5
23
980
0
32
1000
5
41
1019
10
50
1039
15
59
1058
20
68
1078
25
77
1097
30
86
1117
35
95
1136
40
104
1155
45
113
1175
50
122
1194
Resistance values of the Pt1000-sensors
| 18
fuse
load terminals
power supply
terminals
- 88.8
Short loop. Check
cable.
°C
°F
Ω
55
131
1213
60
140
1232
65
149
1252
70
158
1271
75
167
1290
80
176
1309
85
185
1328
90
194
1347
95
203
1366
100
212
1385
105
221
1404
110
230
1423
115
239
1442
In the case of an error, a message is shown on the display
of the controller:
Operating control lamp off.
Check the power supply. Is it disconnected?
no
The fuse of the controller
could be blown. It can be
replaced after the front
cover has been removed
(spare fuse is enclosed in
the accessory bag).
Warning symbols
Operating control lamp
yes
Check the supply line and
reconnect it.
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