M&C TechGroup EC-30_FD Operator's manual - Manual (Page 32)

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Gas sampling and gas conditioning technology 3-4.20-ME
20.1 FUNCTION SEQUENCE OF THE EC30 CONTROL ELECTRONICS
Nine LEDs are available for error diagnosis of the EC30 control electronics to display all the logic and
alarm functions.
N O T E !
Do not change any settings that had been made at the factory!

With the potentiometer P1 the temperature (zero point) is adjusted
(measuring points M1, M2)

Potentiometer P2 figures the alarm < -25°C (measuring point M3).

P3 is used to set the automatic time cycle (measuring point M4)

The switch S1 is used for factory-made tests. It must always be set in
the higher position, ‘operation’.
N O T E !
It is essential to check the setting of switch S1 prior to initial start-up.
Start up is done by applying a voltage to the cooler unit:

LEDs D7 and D10 light up red;

LED D16 lights up green;

The temperature of the low-temperature stages is > +0°C.
Once the pree-cooling stage 
has reached +4°C after about half an hour:
Cooler stage  is activated;
After a short time the temperature of the low-temperature stage 
< 0°C:

LED D7 goes out.
After 1 hour total the temperature of the low-temperature stage 
< -25°C:

LED D6 lights up green;

LED D19 - status all o.k.- lights up green;

The status alarm contact is deactivated;

LED D13 - timing cycle active - blinks red.
It is now ready for cooler operation. The sample gas flows through the pre-cooling stage 
and the
low-temperature stage , after which an external release is done by the status alarm contact, so that
the external sample gas pump or a solenoid valve in the sample gas line can be controlled by the
alarm contact. After additional two hours, low-temperature stage 
will likewise be activated:

LED D17 lights up green.
After a short time the temperature of the low-temperature stage 
< 0°C:

LED D10 goes out.
After half an hour the temperature of the low-temperature stage 
is < -25°C:

LED D12 lights up green;
Three hours after low-temperature stage 
was ready for operation, the solenoid valve will be
switched over to channel 2:

LED D18 - solenoid valve channel 2 selected - lights up green;

LED D16 - cooling ON channel 1 - goes out.