Controller functions
Version 1
RES-402
Page 27
If an error message is reset using the "RESET" signal, the "RESET" signal must be deactivated first.
Invalid error messages may appear when the controller is switched off owing to the undefined oper-
ating state. This must be taken into account when they are evaluated by the higher-level controller
(e.g. a PLC) in order to avoid false alarms.
7.9
Error messages
The RES-402 indicates faults only by means of the "ALARM" LED. No additional error indications are available.
7.10
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 defective
Current transformer signal inter-
rupted
- I
R
measuring wires 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 wires 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 defective
!
!
Temperature
controller
HARDWARE
5
3
6
8
9
8
7
1
4
1
2
2
9
UR
IR
U2
I2
3
2
1
4
5
7
8
