Controller functions
RES-445
Page 51
10.22
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
Fault area
Explanation
Possible causes
"
Load circuit interrupted after U
R
pickoff point
- Wire break, heatsealing band break
- Contacting to heatsealing band defective
PEX-W2 current transformer
signal interrupted
- I
R
measuring wire from current transformer interrupted
#
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
$
U
R
signal missing
- Measuring wire 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
- Contacting to heatsealing band defective
)
Total short-circuit
- Heatsealing band installed incorrectly, insulation at heat-
sealing bar ends missing or incorrectly installed
- Conducting part bypasses heatsealing band completely
+
U
R
signal incorrect
- DIP switches 1 - 3 configured incorrectly (U
2
range)
*
I
R
signal incorrect
- DIP switches 4 + 5 configured incorrectly (I
2
range)
Turns through PEX-W2 current
transformer incorrect
- Check number of turns (two or more turns required for
currents < 30A)
&
Internal controller fault
- Hardware fault (replace controller)