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AK-LM 350
RS8GX102 © Danfoss 10-2013
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Application
AK-LM 350 is a complete monitoring unit with the option of regu-
lation functions via relay switches.
The monitoring unit is used to detect temperature, pressure,
functions etc. in and around appliance cases and cold rooms for
commercial and industrial cooling.
COP calculation can be made on the following systems:
• CO2 booster
• CO2 booster with heat recovery
• CO2 booster with heat recovery and brine
• Cascade plant
• Single stage
The monitoring unit is equipped with data communication and is
operated via a PC.
Functions
Temperature
• Temperature detection
• Temperature monitoring with alarm function
• Extension of the alarm delay when a defrost signal (DI) is re-
ceived
• Interruption of alarm monitoring when a switch signal (DI) is
received
• Temperature control with relay function
Pressure
• Pressure detection
• Pressure monitoring with alarm function
• Pressure control with relay function
Voltages of 0-10 V
• Voltage detection
• Voltage monitoring with alarm function
• Voltage monitoring with relay function
On/Off signals
• Detection of switch signals
• Alarm function with delay + relay function, if applicable
• The switch signal can be inverted
• Hour counter for On time
• Counter for number of changes
Pulse signals
• Registration of electricity, water, gas, etc.
• Energy reading
• Energy reading in a set synchronisation period
• Energy reading in a period between synchronisation pulses
• Receiving synchronisation signal
COP calculation
• COP for MT and LT
• Etais for MT and LT
• Refrigeration capacity for MT and LT
• Heat recovery
• Heat loos
• COSP for the whole system
1. Introduction
Alarm relay
• Two alarm relays that are enabled on different alarm priorities
Data communication
• Connection to system manager or gateway
• Monitoring and data collection
• Customised alarm texts
The COP calculation requires a 0-10 V signal that indicates how
much of the compressor capacity is connected.
This signal can be retrieved from the compressor controller, if it is
one of the following types:
AK-PC 772
AK-PC 781, version 4 or newer (version 4 = January 2013)
AK-PC 783.
The same reading can be used by several different
functions.
Up to 120 inputs and outputs are permitted.
40
20
20
20
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