AK-PC 572
Instructions RI8SR1ML © Danfoss 01/2019
3
AKS 32R /
AKS 2050 /
MBS 8250
10-90% ratiometric
HIGH PRESSURE MODULE
Address = 96
Supply voltage to high pressure module
The power supply can be taken from the main module. It is
important that + is connected to +.
Battery
Ensure that the valve closes if there is no supply voltage.
Stepper valve
FX ventil type CCMT.
Connector:
5: WHITE
6: BLACK
7: RED
8: GREEN
Canbus
Data communication to the main module.
Sensor inputs
• Pt 1000 ohm, AKS 11 or AKS 21.
Contact input AUX 2
Signal from oil level,
or input for fan alarm or another alarm.
Relay output AUX 2
Activation of de-superheating or hot gas dump.
RECEIVER MODULE
Address = 97
Supply voltage to high pressure module
The power supply can be taken from the main module. It is
important that + is connected to +.
Battery
Ensure that the valve closes if there is no supply voltage.
Stepper valve
FX valve type CCMT.
Connector:
5: WHITE
6: BLACK
7: RED
8: GREEN
Canbus
Data communication to the main module.
The section must be terminated using a 120 ohm resistor.
Contact input AUX 3
Signal from heat recovery,
or input for fan alarm or another alarm.
Relay output AUX 3
Activation of heat recovery,
or AUX 3 output for de-superheating or hot gas dump.
MAIN MODULE
AO - Analog output, 3 pcs. AO1, AO3, AO4
Must be used if using frequency converters or EC motors.
Connect 24 V on N and L (separate power supply) Avoid earth
fault current.
- Use double-insulated transformer. The secondary side must
not be earthed.
Obtain 0-10 volts from terminals Com-AO1, N-AO3 and N-AO4.
PAY ATTENTION TO THE POLARITY of N.
(AO3 and AO4 are galvanically isolated. AO1 is not).
AI - Analog inputs,
Pressure transmitters, 4 pcs. AI1 - AI4
Temperature sensors, 4 pcs. AI5 - AI8
• Pt 1000 ohm, AKS 11 or AKS 21.
DI - Digital switch inputs, 8 pcs. DI1 - DI8
The connection may be a shut-down or interruption function.
Select what is to be activated during configuration.
(DI3 can be used as an AUX1 input, but only if regulated with 2
MT compressors).
Supply
24 V a.c. or d.c. Class II is required.
AK-PC 572
17 VA
EXD 316, HP
10 VA
EXD 316, rec
10 VA
Stepper valve, HP _ _VA
Stepper valve rec. _ _VA
Canbus
Communication to the high pressure module and to the receiver
module
"L" to "L" and "H" to "H"
A jumper must be connected between "H" and "R".
Terminate on the receiver module with a resistance of 120 ohm.
If mounting an external display, the termination must be done
differently. See next page.
Important!
In order to set the addresses 96 and 97, you must follow the re-
commended procedure. See next page.
Modbus
It is important that the installation of the data communication
cable is carried out correctly. See separate literature, no. RC8AC.
Remember termination at the termination points.
DO - Digital outputs, 8 pcs. DO1-DO8
DO5 and DO6 are solid state relays. The outputs are used for
connecting a Bitzer CRII. If a Bitzer CRII is not being connected,
output DO6 can be used for activation of an oil valve.
The relays are de-rated to the specified values.
The alarm relay will be driven under normal operation and
will drop in the event of alarms and insufficient voltage to the
controller.
(DO3 can be used as an AUX1 output, but only if regulated with
2 MT compressors).
