M&C TechGroup EC-EX Operator's manual - Manual (Page 20)

20
Gas sampling and gas conditioning technology 3-4.1ME EC-EX 9904
19 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;
Fuse F1
defective; Check for main supply voltage 230V (115V)
at terminals X1.1 (L1) and X1.2 (N)
If O.K.:
check main supply voltage after fuse F1 on
control board in EEX-d box, if necessary
replace fuse. If O.K.: replace faulty control
board.
°C >
ON
°C <
red
pink
(red LED
V18 on
control board
is out)
Equipment does
not cool or
cooling is
insufficient;
Cooling
compressor is
not running;
Protective motor
switch M1.1
Compression
senor alarm S2
Temperature
sensor-alarm S1
First check the correct fit of the plugs in the
EEx-d box ( power supply for compressor )
If o.k.:
Check voltage in EEx-d box at terminals X2.7
(L) and X2.6 (N) (230V/115V) for compressor:
If 0 Volt on X2.6 and X2.7:
Either the protective motor switch M1.1 has
released and will switch on again after 3 min.
(this state can alternate; a possible reason is
that the ambient temperature or the needed
cooling power is to high) or the internal alarm
relays K1 has cut off because of temperature-
or low pressure alarm:
1. Check compression sensor alarm S2.
Bridge over terminal X3.3 and X3.4. If
compressor runs, remove bridge and reset with
S2. (Possible reasons: very low ambient
temperature while starting the compressor or
empty cooling circuit).
Since September 2004 the pressure sensor
works without a reset switch. If the pressure
sensor releases the cooling aggregate is
potentially empty; please change the
aggregate
2. Check temperature sensor alarm S1.
Bridge over Terminal X3.5 and X3.6. If
compressor runs, remove bridge. After 10 min.
reset with S1. Otherwise renew defect EC-EX
control board.