SHR
521 20
© Dra
yton
06
334
SHR 521
20
.monen.
ind
d
17
|
1
2
S1
S2
S3
3
4
5
6
Temp. Sensor
Pt1000
L
N
R1
N
R2
N
20
19
18
17
16
15
S4
7
8
14
13
12
2 (1) A (220 ... 240) V~
2 (1) A (220 ... 240) V~
R1
R2
T4A
220 ... 240 V~
5. Tips for fault finding
can fuse T4A
If a malfunction occurs, a notification is given on the display
of the controller:
Operating control lamp
Warning symbol
Operating control lamp off
The power supply to the controller should
be checked if the control lamp goes out.
o.k.
no
The can fuse of the controller is defective.
It can be replaced after removal of the
front cover (spare fuse is enclosed in the
accessory bag).
Operating control lamp flashes red. On the display the
symbol
and the symbol
appear.
Sensor defect. An error code is shown
on the relevant sensor mode instead of
a temperature.
- 88.8
888.8
open circuit. Check
the line.
Short-circuit.
Check the cables.
Pt1000 temperature sensors when discon-
nected can be checked with an ohmmeter.
In the following the resistance values
corresponding to different temperatures
are listed.
Resistance values of
the Pt1000-sensors
