Operating Manual
Document no.: 042036
Version:
V1.1
MC 785T-DF
Client: General
Page:
12 of 20
6.
Sensor calibration
The sensors can be calibrated with the parameters P14 (Sensor-1), P15 (Sensor-2), P16 (Sensor-3)
and P17 (Defrost Sensor-4). Should a sensor indicate 0.2°C too much, for example, then the
corresponding offset-parameter must be set at -0.2°C.
7.
Alarms
The alarm relay is on in a normal position; it falls during an alarm. In this way it also gives an alarm if
there is a power failure. During the alarm the alarm LED on the front flashes. Depending on the
Internal Parameters the control will either stop of continue.
An alarm can be caused by:
- Control sensor is not present (F1).
- Sensor defect (E1, E2, E3 or E4).
- The alarm sensor gives a minimum or maximum alarm (LO or HI).
- External alarm (EC).
By pressing the
SET DAY
key the alarm relay can be reset. The error message will remain in the
display until the error has been resolved. The alarm LED will also continue to flash.
Temperature alarm:
LO = Minimum alarm
HI = Maximum alarm
No control sensor:
F1 = Control sensor is not present
Sensor failure:
E1 = Sensor 1 defect
E2 = Sensor 2 defect
E3 = Sensor 3 defect
E4 = Sensor 4 defect (defrost sensor)
External alarm:
EC = External alarm contact
