AGC Designer’s Reference Handbook
DEIF A/S Page 95 of 168
Service timers
The unit is able to monitor the maintenance intervals. The menu is available in the system setup.
6090 Service timer
The function is based on running hours. When the adjusted time expires, the unit will display an
alarm. The ‘alarm acknowledge’ function resets this alarm.
When acknowledging the alarm, the timer will be reset and a new service timer alarm will only
reoccur after the adjusted time has elapsed. The running hours is counting, when the running
feedback is present.
Wire break detection
If it is necessary to supervise the sensors/wires connected to the analogue inputs (4-20mA,
VDO and PT100), then it is possible to use the menus 4370-4430 depending on the HW options
available in the unit. If the measured value on the input is outside the normal dynamic area of
the input, it will be detected, as if the wire has made a short circuit or a break. An alarm with a
configurable fail class will be activated.
Wire failure area Normal range Wire failure area
4-20mA Below 4mA 4-20mA Above 20mA
VDO 104 0…40% - 60…100%
VDO 105 0…40% - 60…100%
VDO 106 0…40% - 60…100%
PT100 – 106 0…40% - 60…100%
PT100 – 109 0…40% - 60…100%
The fail class drop
down panel is acti-
vated, and the user
wants to select the ‘trip
of GB’ fail class.
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