Device functions
Page 54
RES-5006
Version 1
8.20
Error ranges and causes
Explanations of the possible error causes can be taken from the following table.
Malfunc-
tion range
Explanations
Possible causes
Interruption of the load circuit after
the U
R
pickup point
- Wire break, heating element break
- Contacting at the heating element defective
Interruption of the signal from the
transformer
- I
R
measurement line from the transformer interrupted
Interruption of the primary circuit
- Line break, Triac defective in the controller,
- Primary coil of the impulse transformer interrupted
- Kb fuse open
Interruption of the secondary cir-
cuit in front of the U
R
pickup point
- Wire break
- Primary coil of the impulse transformer interrupted
U
R
signal missing
- Measurement line interrupted
Partial short circuit (Delta R)
- Heating element is partially bridged through a conducting
part (hold-down device, safety rail, etc.)
Interruption of the parallel circuit
- Wire break, heating element break
- Contacting at the heating element defective
Complete short circuit
- Heating element incorrectly installed, insulation at the head
of the rail missing or incorrectly installed
- Conducting part bridges heating element completely
U
R
signal incorrect
- U
2
outside of the permitted range of 0.4…120 VAC
I
R
signal incorrect
- I
2
outside of the permitted range of 30…500 A
Coils through transformer incor-
rect
- Check number of coils (for current < 30 A, two or more
coils are required)
5
3
6
8
1
4
1
2
2
9
7
8
UR
IR
Temperature
controller
HARDWARE
9
