M&C TechGroup EC-30_FD Operator's manual - Manual (Page 24)

24
Gas sampling and gas conditioning technology 3-4.20-ME
17 TROUBLE SHOOTING
Troubleshooting is made much easier by the LED function display.
The following table shows possible reasons for error and how to correct them (not applicable for the
running-up phase of the cooler).
LED display Function error
and status
alarm
Probable cause Checking / Correction
°C >
ON
°C <
Equipment
does not cool; No mains power; Check the mains voltage 230V (115V) at terminal X0
(see Fig. 6 and 7);
If mains voltage OK:
replace defective EC automatic control board.
°C >
ON
°C <
red
pink
Equipment does
not cool or the
cooling is
insufficient;
Cooling compres-
sor is not running;
Check that the plugs are firmly seated in the sockets
for power connection to the compressor;
If OK:
Measure the voltage 230V/115V for the compressor
at the EC automatic control board at pins 21 and 22
(see Fig. 9).
If not OK:
Replace the defective EC automatic control board;
If OK:
Does the red LED D3 (see Fig. 9) on the EC
automatic control board lights up for more than one
second?
(A blocked unit will be switched off by the motor
breaker switch);
If yes:
Replace the starting condenser;
If compressor does not run:
Send cooler in for repair.
°C >
ON
°C <
red
pink
See above Cooling compres-
sor runs; over-loa-
ding of the cooler
unit; Check:
- Is the maximum of 250 l/hr of gas flowing?
- Is the ambient temperature max. +45°C?
- Are the air suction filters dirty?
- Are the fans working?
- Are the condenser fins contaminated?
If OK:
Check temperature at the EC automatic control
board (18.2);
If the temperature is < 4°C (< 0,4V) for a nominal
set temperature of +1°C:
Replace EC automatic control board;
If temperature > 4°C (>0,4V):
Check PT100 temperature sensor (19.1);
If not OK:
Replace sensor;
If sensor and electronics OK:
Send cooler in for repair.