Controller functions
RES-407
Page 37
10.14
Fault areas and causes
The table below explains the possible fault causes.
Temperature
controller
HARDWARE
5
3
6
8
9
8
7
1
4
1
2
2
9
UR
IR
U2
I2
3
2
1
45
8
7
Fault area
Explanation
Possible causes
c
Load circuit interrupted after U
R
pickoff point
- Wire break, heatsealing band break
- Contact to heatsealing band defective
PEX-W2/-W3 current transformer
signal interrupted
- I
R
measuring wires from current transformer interrupted
d
Primary circuit interrupted
- Wire break, triac in controller defective
- Primary winding of impulse transformer interrupted
Secondary circuit interrupted
before U
R
pickoff point
- Wire break
- Secondary winding of impulse transformer interrupted
e
U
R
signal missing
- Measuring wires interrupted
f
Partial short-circuit (delta R)
- Heatsealing band partially bypassed by conducting part
(clamp, opposite heatsealing bar etc.)
g
Parallel circuit interrupted
- Wire break, heatsealing band break
- Contact to heatsealing band defective
h
Total short-circuit
- Heatsealing band installed incorrectly, insulation at
heatsealing bar ends missing or incorrectly installed
- Conducting part bypasses heatsealing band completely
i
U
R
signal incorrect
- Up to March 2005: DIP switches 1 - 3 configured incorrectly
(U
2
range)
- As of April 2005: U
2
outside permissible range from
0.4…120VAC
