Monitoring Functions - Danfoss AK-LM 330 Design Manual

Monitoring functions

Thermostats (10 units)
The function may freely be used for:
• Temperature registration
• Temperature monitoring with alarm function
• Temperature control with relay function
An example could be thermostat control of the fan in the com-
pressor compartment.
The thermostat can be used as one of the sensors Saux1, Saux2,
Saux3, .. etc.
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.
Each thermostat function can also detect two digital signals which
can be used to change alarm signals.
One signal that will change the alarm delay so that a change is
made to the long alarm delay. This signal is primarily used with a
defrosting so that no alarm is triggered during a defrosting.
A signal that stops the alarm. This signal is primarily used during
stoppage of a refrigeration appliance, e.g. during cleaning.
Each thermostat has the following available functions:
• Name
• Sensor signal
• Display of the current reading
• Selection of relay function
• Setting the cut-out value for relays
• Setting the cut-in value for relays
• Selection of the input signal that changes to Alarm Delay 2
• Selection of the input signal that stops alarms
• High alarm limit
• Delay time for 'high alarm'
• Delay time 2 for 'high alarm'
• Alarm text for 'high alarm'
• Low alarm limit
• Delay time for 'low alarm'
• Alarm text for 'low alarm'
68 RS8FR302 © Danfoss 2015-08
Pressostats (5 units)
The function may freely be used for:
• Pressure registration
• Pressure monitoring with alarm funktion
• Pressure control with relay function
An example could be pressure control of a vessel:
The pressostat can use one of the pressure transmitters Paux1,
Paux2, Paux3... etc.
Set cut-in and cut-out limits for the pressostat. The pressostat
output is connected based on the current pressure.
Alarm limits can be set for low and high pressure including sepa-
rate alarm delays.
The individual pressostat function can be adapted to the current
use as it is possible to name the pressostat control and customise
alarm texts.
Each pressostat has the following available functions:
• Name
• Pressure signal
• Display of the current reading
• Selection of relay function
• Setting the cut-out value for relays
• Setting the cut-in value for relays
• High alarm limit
• Delay time for 'high alarm'
• Alarm text for 'high alarm'
• Low alarm limit
• Delay time for 'low alarm'
• Alarm text for 'low alarm'
AK-LM 330