Trouble Shooting - M&C PMA Series Instruction Manual

21

TROUBLE SHOOTING

Error Possible reason
No indication No supply voltage
No sample gas flow Sample line or filter is blocked
Contamination of the internal
diaphragm pump
B11 lights up Fault High
(Measuring range exceeded
3.125 %) (> 20.5 mA)
B5 lights up Fault Low
(values below measuring range
more than 4.375 %)
(< 3.2 mA)
B6 lights up Error internal measuring range
selection
B2 lights up Coupling signal error
B3 lights up LED short-circuit error
B4 lights up LED-circuit open error
B9 lights up -15V Power error
B10 lights up +15V Power error
B13 lights up Low temperature error
B8 lights up Excess temperature error
B7 lights up Min. flow error
B12 lights up Max. flow error
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Check/Repair
Check supply voltage according to type plate.
Check whether mains cable is plugged in accurate.
Check fine fuse in the low heat device socket.
Check fine fuses F1, F2 (TR5) on main board (next to trans-
former)
Check sample system.
Can be switched off via JP14
Adapt measuring range
>
Span potentiometer defective?
Can be switched off via JP12
Zero calibration necessary?
Zero potentiometer defective?
Measuring range selection switch defective (no contact)
Can be switched off via JP6
The measuring cell is not coupling, contaminated or the
LED is too dark or coupling sensor is defektive.
Attention: consideration of functional safety is based on
this coupling error! JP6 has to be adjusted to 2-3! (enable
coupling error)
Transmitter-projections-LED defektive
Transmitter-Projektions-LED defektive or circuit interrupted
Transformer error or external undervoltage
Transformer error or external undervoltage
Can be switched off via JP8
Heating (P6) resp. fault message threshold (P14) adjusted
correctly? Thermal fuse has triggered? Temperature sensor
defective?
Reference voltage defective or misadjusted (P13)
Heating (P6) resp. fault message threshold (P14) adjusted
correctly? Thermal fuse has triggered? Temperature sensor
defective?
Reference voltage defective or misadjusted (P13)
No flow, fault message threshold misadjusted (P20), flow
sensor defective.
Can be switched off via JP3
Flow too high, fault message threshold misadjusted (P7,
P8), flow sensor defective.
PMA30 | 1.01.03 35