AK-PC 351 User Guide RS8GZ302 © Danfoss 2015-06 15
I/O conguration
Here you can see which outputs and inputs your settings have established.
The connection points shown cannot be changed, but the analog input measurements can be adjusted.
Digital outputs
1:
2:
3:
.
6:
On/o outputs
The outputs are set up automatically in the following order:
a) If a PWM output is needed, place it on DO6
b) Compressors and unloader valves from DO1 and above
c) Next, fans
d) Alarm
(One output can be on or o with an activated relay.)
On
O
Digital inputs
1:
2:
3:
..
8:
On/o inputs
The following connection points are xed and cannot be changed:
DI1-4 = Safety input for the respective compressor. DI5 = Safety input for fans. DI6 = External
start/stop. DI7 = Night signal or LP switch. DI8 = General alarm or HP switch.
(The function can be active when the input is connected or disconnected.)
On
O
Analog outputs
1:
2:
Analog outputs
AO1 can be used to control the speed of a compressor.
AO2 can be used to control the speed of fans.
When a function is chosen, the output signal will be 0-10 V.
Analog inputs
1:
2:
3:
4:
.
Analog inputs
The inputs are automatically set up
AI1: Sc3 outdoor temperature sensor, Pt 1000 ohm
AI2: Sd discharge sensor, Pt 1,000 ohm or NTC 86K ohm
AI3: S4 temperature sensor, Pt 1000 ohm or Po pressure transmitter: See the type. See sen-
sor’s lower pressure. See the sensor’s upper pressure.
AI4: S7 temperature sensor Pt 1000 ohm or Pc pressure transmitter: See the type. See sensor’s
lower pressure. See the sensor’s upper pressure.
(A type AKS 2050 pressure transmitter, for high pressure, emits a signal as an AKS 32R.)
All measurements can be calibrated if necessary.
I/O Status
Digital outputs
1:
.
6:
Status of on/o outputs
Here you can see if the function is on or o.
(PWM for a digital scroll must be connected to DO6. The pulsing signal will be able to be seen
as an alternating on/o signal)
Digital inputs
1:
.
8:
Status of on/o inputs
Here you can see the status of the input signal.
Analogue outputs
1:
2:
Status of analogue outputs
Here you can see the size of the output signals as a % of max. signal.
Analog inputs
1:
.
4:
Status of analogue inputs
Here you can see pressure and temperature values received by the controller.
The values include calibration
I/O Summary
DO: Max 6, Used:__
DI: Max 8, Used:__
AO: Max 2, Used:__
AI: Max 4, Used:__
Inputs and outputs used
Here you can see how many of the dierent inputs and outputs are available.
You can also compare this amount with how many have been congured.
If too many have been dened, an exclamation mark (!) will appear.
I/O Manual control
Digital outputs Manual control of a relay output
Under normal regulation, the function of the relay will be in “Auto”.
In the event of an override, the function will be switched to either “On” or “O”.
Remember to switch to “Auto” when the override is to be completed.
Auto / On / O
Analog outputs Manual control of analogue output
During normal regulation, the function of the output will be “Auto”.
In the event of an override, the function must rst be changed to “Manual”,
after which the output signal can be changed from 0-100%.
Remember to switch to “Auto” when the override is to be completed.
Auto / Man
0-100%
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