Operation Manual
Document nr. : 053682
Version : V1.1
MC 795D
Client : General
Page : 9 of 16
6
Sensor calibration.
With the parameters P15 to P18 the humidity sensors can be calibrated. Indicates humidity sensor 1
e.g. 2% Rh too much, the offset (P 15) should be set at -2% RH.
7
Alarms.
In normal position the alarm relay is on and drops during alarm. This to give an alarm if there is a
power failure. During alarm the alarm LED on the front flashes. Depending on the settings of the
Internal Parameters the control will stop or continue.
An alarm can be caused by:
Humidity alarm :
rLO = Minimum alarm humidity
rHI = Maximum alarm humidity
External alarm :
FE = External alarm
Sensor failure :
F1 = No Humidity sensor on Hygrostat-1
F2 = No Humidity sensor on Hygrostat-2
F3 = No Humidity sensor on Hygrostat-3
F4 = No Humidity sensor on Hygrostat-4
E1 = Humidity sensor 1 broken
E2 = Humidity sensor 2 broken
E3 = Humidity sensor 3 broken
E4 = Humidity sensor 4 broken
EA = All control sensors at fault
By pressing the
RESET ALARM
key, the alarm relay is reset. The error message will remain in the
display until the alarm is solved. Also the alarm LED will remain flashing.