Controller functions
Version 1
RES-401
Page 25
6.7
System monitoring/alarm output
To increase operating safety and to avoid faulty heatsealing, this controller incorporates special hardware and
software features that facilitate selective fault detection and diagnosis. Both the external wiring and the internal
system are monitored.
A system fault is reported or differentiated by means of the following indications.
A.)
Red "ALARM" LED on the controller
three states:
1.
Blinks fast (4Hz)
The AUTOCAL function should be executed.
2.
Blinks slowly (1Hz)
The system configuration is incorrect and the zero calibration (AUTOCAL function) was unsuccessful.
3.
Lit continuously:
This indicates that a fault is preventing the controller from being started.
As a rule, it refers to an external wiring fault.
An alarm can only be reset by switching the controller off and then on again.
6.8
Error messages
The RESISTRON
®
temperature controller RES-401 indicates faults only by means of the LED. No additional error
indication is available.
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