Device functions
Version 2
RES-5012
Page 55
8.20
Fault areas and causes
The table below explains the possible fault causes.
Fault area
Explanation
Possible causes
Load circuit interrupted after U
R
pickoff point
- Wire break, heatsealing band break
- Contact to heatsealing band is defective
Current transformer signal inter-
rupted
- I
R
measurement cable from current transformer interrupted
Primary circuit interrupted
- Wire break, triac in controller defective
- Primary winding of impulse transformer interrupted
- Kb contactor open
Secondary circuit interrupted
before U
R
pickoff point
- Wire break
- Secondary winding of impulse transformer interrupted
No U
R
signal
- Measurement cable interrupted
Partial short-circuit (delta R)
- Heatsealing band partially bypassed by conducting part
(clamp, opposite heatsealing bar etc.)
Parallel circuit interrupted
- Wire break, heatsealing band break
- Contact to heatsealing band is defective
Total short-circuit
- Heatsealing band incorrectly installed, no insulation at
heatsealing bar ends or insulation incorrectly installed
- Heatsealing band completely bypassed by conducting part
U
R
signal incorrect
- U
2
outside of permissible range from 0.4…120 VAC
I
R
signal incorrect
- I
2
outside of permissible range from 30…500 A
Wire incorrectly laid through cur-
rent transformer
- Check number of turns (two or more turns required for
currents < 30 A)
5
3
6
8
1
4
1
2
2
9
7
8
UR
IR
Temperature
controller
HARDWARE
9
