M&C TechGroup EC-30_FD Operator's manual - Manual (Page 25)

25
Gas sampling and gas conditioning technology 3-4.20-ME
LED display Function error
and status
alarm
Probable cause Checking / Correction
°C >
ON
°C <
green
red
Equipment does
not cool;
Cooler has been
over-cooled (temp.
< - 2°C);
Ambient
temperature < -2°C
Cooling compressor
stopped;
Cooling compressor
runs continuously;
Ambient temperature must be ≥ +5°C!
Check temperature at EC automatic control board
(18.2);
If temperature < -2°C (< -0,2V):
Check PT100 temperature sensor (19.1);
If not OK:
Replace sensor.
Solid-state relay defective;
Replace EC automatic control board;
Low-temperature
function affected;
Low temperature
stages defective
Sensors;
Peltier elements; Check the fine fuses in the EC30 mains supply;
if o.k.:
Check the voltage at pins 20/21 and 21/22 of the
EC30 automatic control board (Fig. 15);
if voltage > 12V:
Check the voltage for the EC30 temperature
sensors on the EC30 control board at pins 27/28
and 33/34 (19.2);
if voltage > 2,83V (> +10

C):
Replace the relevant sensors;
if voltage < 2,83V (< +10

C):
Check the voltage of the Peltier elements at pins
23/26, channel , and pins 29/32, channel  (Fig.
15)
if voltage for channel thus controlled (LED D16/
D17) = 13VDC:
Peltier element is defective; send cooler in for
repair;
Heat
exchanger
frozen up No gas flow,
sample gas pump
runs;
Peristaltic pump
defective;
Gas flow too low Check peristaltic pump SR25.1
if o.k.:
Raise gas flow to min. 100l/h;
°C >
ON
°C <
green
pink
red