AK-PC 781A Capacity controller RS8HE202 © Danfoss 2017-07 35
4
7
6
5
Planning table
The table helps you establish whether there are enough
inputs and outputs on the basic controller.
If there are not enough of them, the controller must be
extended by one or more of the mentioned extension
modules.
Note down the connections you will require and add
them up
Analog input signal
Example
On/off voltage signal
Example
On/off voltage signal
Example
On/Off output signal
Example
Analog output signal 0-10 V
Stepper output
Example
Limitations
Analog inputs
Temperature sensors, Ss, Sd, Sc3, S4, S7, Stw.., Shr.., Sgc 9
Extra temperature sensor / separate thermostats /PI-regulation 1
Pressure transmitters, P0, Pc, Pctrl. Prec / separate pressostats 5 P = Max. 5 / module
Voltage signal from other regulation, separate signals
Heat recovery via thermostat
On/off inputs Contact 24 V 230 V
Safety circuits, common for all compressors 1 Max.1
Safety circuits, Oil pressure Max. 1/ Comp.
Safety circuits, comp. Motor protection
Safety circuits, comp. Motor temp.
Safety circuits, comp. High pres. thermostat
Safety circuits, comp. High pres. pressostat
Safety circuits, general for each compressor 4
Safety circuits, condenser fans, frequency converter Max. 1/ fan
Safety circuits, flow switch 2
External start/stop 1
LT release input / MT request input / IT release input
Night setback of suction pressure
Separate alarm functions via DI 1
Load shedding
Start of Heat recovery 1 1
Liquid level, Oil level 8
Pulse reset of oil management 1
On/off outputs
Compressors, motors 4
Unloaders
Fan motors, circulation pumps 3
Alarm relay, I'm alive relay
Inject ON Max. 1
Separate thermostat and pressostat functions and voltage measure-
ments
1 Max. 5+5+5
Heat recovery function via thermostat Max.1
Liquid injection in suction line / heat exchanger. Heat gas dump Max.1
MT release output / LT request output / IT on-outp. / IT release outp.
Solenoid valve for Oil. 5
3-way valve 3
Analog control signal, 0-10 V
Frequency converter, Compressor, fans, pumps, valves etc. 5
Valves with stepper motor. Parallel valves, if applicable 1
Sum of connections for the regulation 27 0 8 16 5+1 Sum = max. 120
Number of connections on a controller module 11 11 0 0 0 0 8 8 0 0 0
Missing connections, if applicable 16 - 8 8 5+1
The missing connections to be supplied by one or more extension modules: Sum of power
AK-XM 101A (8 analog inputs) ___ pcs. á 2 VA = __
AK-XM 102A (8 digital low voltage inputs) ___ pcs. á 2 VA = __
AK-XM 102B (8 digital high voltage outputs) 1 ___ pcs. á 2 VA = __
AK-XM 103A (4 analog inputs, 4 analog outputs) 1 1 ___ pcs. á 2 VA = __
AK-XM 204A / B (8 relay outputs) ___ pcs. á 5 VA = __
AK-XM 205A / B (8 analog inputs. + 8 relay output) 1 1 ___ pcs. á 5 VA = __
AK-XM 208C (8 analog inputs + 4 stepper outputs) 1 1 ___ pcs. á 5 VA = __
AK_OB 110 (2 analog outputs) 1 ___ pcs. á 0 VA = 0
1 pcs. á 8 VA = 8
Sum =
Sum = max. 32 VA
The example:
None of the 3 limitations are exceeded => OK
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