Danfoss AK-CH 650 User Manual

AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02 31
A bit more abot the functions
Compressor
Regulation of up to 6 compressors. Up to three unloaders per
compressor. Compressor No. 1 or 2 can be speed-regulated.
Condenser
Regulation of up to 8 condenser steps.
Fans can be speed-regulated. Either all on one signal or only the
rst fan of several.
Relay outputs and solid state outputs may be used, as desired.
Speed regulation of condenser fans
The function requires an analog output module.
A relay output may be used for start/stop of the speed regulation.
The fans may also be cut in and out by relay outputs.
Safety circuit
If signals are to be received from one or more parts of a safety
circuit, each signal must be connected to an ON/OFF input.
Day/night signal for raising the suction pressure
The clock function can be used, but an external ON/OFF signal
may be used instead.
If the “PO optimisation” function is used, no signal will be
given concerning the raising of the suction pressure. The PO
optimisation will see to this.
Separate thermostat and pressure control functions
A number of thermostats can be used according to your wishes.
The function requires a sensor signal and a relay output. In the
controller there are settings for cutin and cutout values. An associ-
ated alarm function may also be used.
Separate voltage measurements
A number of voltage measurements can be used according to
your wishes. The signal can for example be 0-10 V. The function
requires a voltage signal and a relay output. In the controller there
are settings for cutin and cutout values. An associated alarm func-
tion may also be used.
If you want to know more about the functions, go to
chapter 5.
Max. number of steps 8
Speed regulation x
Step and speed regulation x
Speed regulation on rst step x
Limitation of speed during night operation x
Heat recovery function via thermostat function x
Heat recovery function via DI signal x
Trouble-shooting function FDD on condenser x
Condenser pressure reference
Floating condensing pressure reference x
Setting of reference for heat recovery function x
Safety functions
Min. suction pressure x
Max. suction pressure x
Max. condensing pressure x
Max. discharge gas temperature x
Min. / Max. superheat x
Safety monitoring of compressors x
Common high pressure monitoring of compressors x
Safety monitoring of condenser fans x
General alarm functions with time delay 10
Frost protection x
Miscellaneous
Extra sensors 7
Option for connection of separate display 2
Separate thermostat functions 5
Separate pressostat functions 5
Separate voltage measurements 5
3
Connections
Here is a survey of the possible connections. The texts can be read
in context with the table in point 4.
Analog inputs
Temperature sensors
• S4 and S3 (brine temperature)
Must always be used in connection with compressor regulation.
• Ss (suction gas temperature)
Must always be used in connection with compressor regulation.
• Sd (discharge gas temperature)
Must always be used in connection with compressor regulation.
• Sc3 (outdoor temperature)
To be used when monitoring function FDD is used.
To be used when regulation is performed with oating
condenser reference.
• S7 (Hot brine return temperature))
This must be used when the control sensor for the condenser
has been selected as S7.
• Saux (1-4), Extra temperature sensors, if applicable
Up to four additional sensors for monitoring and data collection
may be connected.
These sensors can be used for general thermostat functions.
• Shrec (heat recovery thermostat)
Must be used when heat recovery is controlled via a thermostat
function.

Danfoss AK-CH 650 Specifications

General

Brand	Danfoss
Model	AK-CH 650
Category	Controller
Language	English