8 Function description RC.1J.Z4.02 © Danfoss 09/1999 AKC 25H1
The alarm message concerning a failure in the safety circuit can be extended into a more
concrete message by using alarm module type AKC 22H. Read the later section on
monitoring.
Hourmeter
The run time of a compressor motor is constantly registered. It can be shown on the display
how many hours the compressor has been operating since the hourmeter was last reset, and
how many starts there have been during the past 24 hours. (About resetting, see later).
Compressor Status Compressor No.( ) ( ) Run time
Compressor Status Compressor No.( ) ( ) Cut / 24 h
All relay outputs are registered by a counter. The run time is registered here for whatever has
been connected to the output. This registration can be shown on the display, and reset, if
required.
Output Configuration DO Relay No.( ) DO( ) Time h
The hourmeter range is from 0 to 30,000 hours.
Temperature sensor
The controller has an input, S6, for temperature measurement. The measurement has no
influence on any regulating functions. The input is, however, used for the night setback signal
when the regulation has to change between two different suction pressures. (A short circuited
input raises the suction pressure).
If data are to be logged from the input, it cannot at the same time be used as signal input for
the change between the two suction pressures.
The service function is used for displaying the temperature values.
Service Mode Measurements of input terminals S6
°
C
Forced control of compressor capacity
There can be forced control of the capacity where the normal regulation and the safety
function are disregarded. The capacity is set in per cent of the regulated capacity.
Compressor Capacity ctrl. Settings Compressor ctrl Man. Cap OFF/ON
Man. Cap. % ___
Compressor control, but no condenser control
The controller is normally used for controlling both the compressor and the condenser. If the
controller is only used for controlling the compressor, a missing signal at the pressure
transmitter input Pc will trigger an alarm signal. To avoid this alarm, a signal can be picked up
from pressure transmitter PO. Connect terminal 72 to 76 (“s” to “s”). The monitoring function
for PCmax must be set at the highest possible value.
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