18
Start
Apply
mains voltage
LED “Power” is illuminated
Mains voltage applied
LEDs 1 – 4 are flashing
System is being started and tested.
Output contacts are open.
Operation
Temperature control
Value below switchpoint MIN
LED 3 illuminated
Output relays 25/26 and 22/24 closed
Switchpoint MIN exceeded
by 2 °C
LED 3 not illuminated
Output relays 25/26 open, 22/24 closed
Switchpoint MAX exceeded
LED 2 illuminated
Output relays 22/24 open
Temperature 2 °C below
switchpoint MAX
LED 2 not illuminated
Output relays 22/24 closed
LEDs 1 and 4 not illuminated
Output relays 20/21 and 29/30 closed
Alarm
Measuring channel 1 alarm
LED 1 illuminated
Output relays 20/21 open
Measuring channel 2 alarm
LED 4 illuminated
Output relays 29/30 open
Start, Operation, Alarm and Test
TRS 5-40
Fig. 8
Assignment of signal LED / push button / equipment:
LED 1 / Push button 1 / Output relay 1: Measuring channel 1
LED 2 / Output relay 2: Measuring channel 2, temperature control
LED 3 / Output relay 3: Measuring channel 2, temperature control
LED 4 / Push button 4 / Output relay 4: Measuring channel 2
Error message
Control unit and
bus status LED
Signal
LED
Power LED
Control keys
