14
Function description
RC.1J.Z4.02
©
Danfoss
09/1999
AKC 25H1
Monitoring of the different parts of the compressor's safety circuit
Instead of a simple monitoring of the safety circuit, this monitoring may be extended with an
alarm module, type AKC 22H. It will now be possible to deliver a definitive alarm message
telling you which part of the safety circuit has fallen out. The connection must be established
in this way:
The connections and the individual alarm messages are fixed and cannot be changed:
- Compr. No ( ) oil press. cut out
(too low oil pressure)
- Compr. No ( ) current cut out
(motor overload cut out)
- Compr. No ( ) motor prot. cut out
(too high temperature in motor winding)
- Compr. No ( ) disch. temp. cut out
(too high pressure gas temp.)
- Compr. No ( ) disch. press. cut out
(too high discharge pressure)
- Compr. No ( ) safety cut out
(signal missing from alarm module)
- Compr. No ( ) not in auto
(switch in manual mode)
Carry out the settings mentioned in the earlier section “Signal from the safety controls”.
All alarm modules are double, i.e. one module can monitor two safety circuits. Each circuit is
connected to a DI input on AKC 25H1. Only inputs DI1 to DI8 can be used as inputs from an
alarm module. DI9 is only for monitoring of other automatic controls.
Monitoring of other automatic controls
The controller is provided with nine digital inputs. Some of the inputs are used for information
pertaining to the status of the safety circuits for the individual compressors, others for the
individual condenser steps. The remaining inputs may be used for other purposes to the
required extent. If an input is used for another purpose, an alarm text can be defined which is
transmitted when the input is broken. The following alarm texts can be defined:
Input Configuration
Alarm input No. 1..9
DI( ) Type = 3 (3 = Other automatic)
DI( ) Dev. No. ___
1: Low liquid level
2: Refrigerant leak
3: Current fault
4: Phase fault
5: Liquid flow switch
6: Air flow switch
7: Flow pump fault
8: Condensate pump fault
9: High codensate level
Time delays are defined for the individual alarm inputs.
Input Configuration
Alarm input No. 1..9
DI( ) Del. m ___
