M&C TechGroup EC-EX Operator's manual - Manual (Page 17)

17
Gas sampling and gas conditioning technology 3-4.1ME EC-EX 9904
16.1 FUNCTION SEQUENCE AND LED FUNCTION DISPLAY
Three function display LED's are provided to give a visualization of the function sequence during start-
up of the cooler. According to the type of installation, they are located either on the front panel or the
back panel of the cooler (Fig. 2). The top LED (red) indicates that the temperature set by the EC
automatic control electronics has been exceeded or has not been reached. The two-colour
(pink/green) LED in the middle shows that the cooler compressor is operating. The bottom red function
display LED gives an alarm if the temperature falls too low.
Switching the cooler on
As soon as there is a mains voltage, the top red LED lights up. This
indicates that the temperature of the cooler is above +8°C. The two-
coloured LED in the middle lights up as pink once the cooler
compressor is in operation.
Normal operation
After around 30 minutes the cooler has been cooled down to a
temperature below +8°C. The top red LED goes out.
The status collector alarm contacts are deactivated and control the
automatic external release for gas measurement.
The cooler compressor is switched of as soon as the cooler stage
reaches the controlled temperature of +5°C. The middle LED lights up
as green.
The cooler compressor will be alternately switched on and off by the EC automatic control electronics
in a load-dependent cycle. The middle LED will alternately light up as pink and green (normal
operating functions).
°C >
ON
°C <
red
pink
green
°C >
ON
°C <
pink
green