General Monitoring Functions - Danfoss AK-PC 772A User Manual

General monitoring functions

General alarm inputs (10 units)
An input can be used for monitoring an external signal.
The individual signal can be adapted to the relevant use as it is
possible to give the alarm function a name and to indicate your
own alarm text.
A time delay can be set for the alarm.
General thermostat function (1 unit)
The function may freely be used for alarm monitoring of the plant
temperatures or for ON/OFF thermostat control. An example could
be thermostat control of the fan in the compressor compartment.
The thermostat can either use one of the sensors used by the
regulation (Ss, Sd, Sc3) or an independent sensor (Saux1).
Cutin and cutout limits are set for the thermostat. Coupling
of the thermostat's output will be based on the actual sensor
temperature. Alarm limits can be set for low and high temperature,
respectively, including separate alarm delays.
The individual thermostat function can be adapted to the relevant
application as it is possible to give the thermostat a name and to
indicate alarm texts.
General pressure control function (1 unit)
The function may freely be used for alarm monitoring of plant
pressure or for ON/OFF pressure control regulation.
The pressure control can either use one of the sensors used by the
control function (Po, Pc) or an independent sensor (Paux1).
Cutin and cutout limits are set for the pressure control. Coupling of
the pressure control's output will be based on the actual pressure.
Alarm limits can be set for low and high pressure, respectively,
including separate alarm delays.
The individual pressure control function can be adapted to the
relevant application as it is possible to give the pressure control a
name and indicate alarm texts.
AK-PC 772A Capacity controller RS8HF102 © Danfoss 2017-07
General voltage input with ancillary relay (1 unit)
A voltage input are accessible for monitoring a measurement
of the installation. Examples are monitoring of a leak detector,
moisture measurement and level signal - all with ancillary alarm
functions. The voltage input can be used to monitor a standard
voltage signal (0-5V, 1-5V, 2-10V or 0-10V). If required, one can also
use 0-20mA or 4-20mA if external resistance is placed at the inlet
to adjust the signal to the voltage. A relay outlet can be attached
to the monitoring so that one can control external units.
Following can be set/read out:
- Freely definable name
- Selection of signal type (0-5V, 1-5V, 2-10V, or 0-10V).
- Scaling of read-out so it corresponds to measuring unit
- High and low alarm limit including delay times
- Freely definable alarm text
- Attach a relay output with cut in and cut-out limits including
delay times
General PI function (1 units)
The function can be freely used for controlling a required function,
or it can be used to send signals to the controller regarding oper-
ating states. An example could be an out/in control for the use of
the heat recovery function.
Signals can be received from the following fx.:
- Temperature sensor
- Pressure transmitter
- Saturation temperature
- Voltage signal
- Internal signals such as: Tc, Pc, Ss and Sd
Signals are shown on the next page.
Signals can be sent to the following:
Voltage signal
Valve with stepper motor
PWM (pulse width modulated) signal for AKV valve.
The PI function is shown overleaf.
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