M&C CG-2 - Troubleshooting Guide

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20 TROUBLE SHOOTING
The following table is intended to show the possible sources of errors and their rectification
Problem/Display
Possible Cause
Check/Rectification
LED’s do not light up
Valves do not switch over
Temperature controller out of
order
No mains power
Sub-D-plug not inserted in
socket X2
F1/2 fuses defective
Mains ‘ON’
OK.
Check that mains cable fits properly
(X1);
OK.
Check whether sub-D-plug is present
and is properly plugged in;
OK.
Check whether bridge in sub-D-plug ex-
ists (s. Fig. 6);
OK.
Check fuses and replace if necessary;
Converter does not heat up
LED K1 off
Heater defective
Temperature controller
defective
Solid-state relay defective
Sensor short circuit
Measure voltage at terminals X4/2 and
3;
OK.
Replace heater;
Not OK.
Measure voltage at terminal X4/6 and
7;
Voltage < 8 V DC?
Check controller according to operating
instructions;
Voltage > 8 V DC?
Replace solid-state relay;
Change sensor;
Valves do not switch
LED’s do not light up
No mains supply (see above)
Sub-D-plug not inserted into
socket X2 (see above)
Internal circuit;
No solder link 1-6 in sub-D-
plug
External circuit;
Error in external controller
see above
see above
Check sub-D-plug and if necessary sol-
der link;
Check external controller;
Valves do not switch
LED’s light up
Valve defective
Check that valves function
No sample gas flow
Valves defective (see above)
Gas sample lines
blocked or leaking
See above
Check gas sample lines;
Check for gas-tightness
No conversion
Cartridge used up
Cartridge does not heat up
(see above)
No sample gas flow (see
above)
Change cartridge (see chapter 17.1)
See above
See above