User manual
Document Nr. : 080631
Version : V1.0
MC 785 KLIMA 0-100
C
Client : General
Page : 11 of 16
6.
Sensor calibration
With parameters P10 and P11 can the temperature and RH sensor be calibrated. Indicates the
temperature sensor e.g. 0,2
C too much, the offset (P 10) should be set at -0,2
C.
7.
Alarms
If the extra relay is set as watch alarm (parameter P20=0), in normal mode the relay is on and drops
during alarm. In this mode also an alarm is given if the power supply is lost. If the extra relay is
programmed as control alarm (P20=1), in normal mode the relay is off and is switches on during
alarm.
During alarm the alarm LED on the front flashes. Depending on the setting of the Internal Parameters
the control will stop or continue.
An alarm can be caused by:
Temperature alarm :
tLO
= Minimum temperature alarm
tHI
= Maximum temperature alarm
RH alarm :
rLO
= Minimum RH alarm
rHI
= Maximum RH alarm
External alarm :
F1
= External alarm
Sensor failure :
E1
= Temperature sensor broken
E2
= RH sensor broken
The temperature alarm messages tLO, tHI, E1 and external alarm message F1 are displayed in the
temperature display (left top). The RH alarm messages rLO, rHI and E2 are shown in the RH-display
(right top).
By pressing the
RESET ALARM
key the extra relay will, if configured as alarm relay, be reset. The
error message remains during the failure in the display. Also the alarm LED will continue to flash.
