Danfoss AKC 25H1

AKC 25H1 Function description RC.1J.Z4.02 © Danfoss 09/1999 17
The function is used in connection with installation, service and trouble-shooting on the
system. With this function, the connected functions can be checked, fx. temperature sensors,
pressure transmitters, ON/OFF inputs and alarm function.
Measurements
The following functions can be read and checked here:
- sensor values
- signal value on the “Ext.Ref.” input
- status of “Ext.Main” input
- status of input signals
- status of output signals
Service mode Measurements of input terminals P0 Bar
Pc Bar
Ss ° C
Sd ° C
S6 ° C
Ext. Ref. V
Ext. Main
DI1....9
Measurements of output terminals DO1 Relay ...... DO9 Relay
AKC ON
Alarm Relay
Forced control of outputs
Components connected to the controller’s outputs can be forced control.
NB! There is no monitoring when the outputs are subject to forced control.
Man. Ctrl. (access requirements)
To use this service function, two settings have to be made:
1. The function switch is put in pos. Service
Main function Main Function Settings Main switch = -1
(This will trigger an alarm message “Standby mode” to indicate that regulation has
stopped, and that all outputs are in pos. OFF).
2. “Manual control” is put in pos. ON
Service Mode Manual control output Man. ctrl = ON
(Service function is activated).
The individual outputs can now be controlled by force.
DO1 Relay
ON/OFF setting of relay outputs DO1...DO9
If a compressor with unloaders has been connected, one of the outputs will control the
compressor while the remaining relays will control the unloaders.
Service Mode Manual control output DO( ) Relay: OFF/ON
AKC ON
ON/OFF setting of relay output “AKC ON”
(The function stops the regulation in all connected AKC 114, 115 and 116 controllers).
Only the relay output is force-controlled. No signal is transmitted to the DANBUSS.
Service Mode Manual control output AKC ON: OFF/ON
Alarm Relay
ON/OFF setting of alarm output
OFF activates the alarm (interrupted output = active alarm).
Service Mode Manual control output AlarmRelay: OFF/ON
When operation with forced control is terminated (the service function is abandoned and the
setting of the function switch is changed (Main Switch = 0 or 1), “Man. ctrl.” will automatically be
put in pos. OFF. At the same time the settings of the outputs will change back to the factory-set
values.
Service