ICD_AirConditioning

The air conditioning control is under the contractor's responsibility. It is controlled via a RS232 serial interface and provides the commands to switch on/off the Air Conditioning, read the enclosure temperature and set the reference temperature.

The control is deployed on the Auxiliary LCU.
The Air Conditioning is controlled by a Sauter PLC, connected to a RS232 Serial Port via Connector W41.
The temperature values of the M1 sensors are input to the Sauter PLC, via the Connector W41.
The Air Conditioning Control System gives a Warning flag when the Dew point temperature is reached. The Dew point sensor readout is available to ESO via the RS232. The parameter Dew point Margin Tdm can be adjusted via the RS232.
The thermal controller PKC from EROELELECTRONIC keeps the Signal cabinet internal temperature equal to the ambient air temperature. It acts on a motorized valve regulating the coolant flow inside the heat exchanger of the Signal cabinet. One PT100 senses the ambient air temperature, the other one senses the Signal cabinet internal air temperature. The LCU has got no control on the regulation but monitors the two temperature sensors connected to the thermal controller PKC via the Connector W43.

The connection layout and pin assignment is given in Annex 1 VLT-DWG-ESO-15154-1769

Item	From	To	Signal	Description
COMMUNICATION:
1			Air Conditioning Communication	RS232 Port to Sauter PLC Protocol details in [RD 10]
AIR CONDITIONING:
10	ATS	LCU	Air Conditioning status	Get status information on the air Conditioning system
11	ATS	LCU	Cooling water temperature	Get cooling water temperature
12	ATS	LCU	Enclosure temperature	Get enclosure temperature
13	LCU	ATS	Start/Stop Air Conditioning	Start using the reference temperature Stop
14	LCU	ATS	Air Conditioning Reference Temperature	Set the Reference Temperature
15	LCU	ATS	Dew point sensor	Get Dew point sensor value
16	LCU	ATS	Dew point sensor Temperature Margin	Set the Dewpoint Temperature Margin
17	LCU	ATS	Dew Point Warning	warning Flag ON when Dew Point is reached inside the enclosure during Daytime Stand By mode.
M1 TEMPERATURES:
20	LCU	ATS	Temperature M1 A,B,C	Mirror M1 temperatures as read from Altitude LCU

Item	From	To	Signal	Description
COMMUNICATION:
1	ATS	LCU	Thermal controller Communication	RS485 Port to PKC EROELECTRONIC - Protocol details [RD19]
GENERAL COMMANDS:
2	ATS	LCU	Read temperatures	Cabinet Temperature Ambient Air Temperature

Last modified: Wed Jan 150 10:20:44 MET 2003