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ProKiln GAC400 PROBE GAS SAMPLING SYSTEM | OI/GAC400-EN REV. A
10 Diagnosis / error messages
Automatic processes
If an error occurs, the system triggers automatic processes to protect the gas sampling probe.
Phase 1
If the probe gas sampling system detects an alarm the probe is retracted out of the kiln.
WARNING! – Probe movement. Do not stand in the area of travel of the probe or probe buggy.
Phase 2
The probe goes into manual mode
Result: Because the gas sampling probe is in manual mode the probe will no longer move in on its own.
Phase 3
If the probe gas sampling system detects a Maintenance request, the probe continues to operate.
Note
In the event of danger to personnel, you can interrupt these automatic processes by pressing the EMERGENCY-STOP switch.
Irregularities and corrective action
Observation
Untypical running noise
Whistling noise from compressed-
air system
Probe travel is jerky
Probe not centred in kiln aperture Incorrect probe alignment/positioning
Untypical or gurgling noises in the
cooling-water circuit
Unusual probe movements (probe
rocks up and down,
sways to the sides, jerky travel)
Compressed-air hose bursts or
compressed-air tube cracks
Cooling-water tube or hose bursts
or cracks
Probe or heat exchanger cracks
Probe movement blocked
Possible cause
Heat exchanger defective Motor M1 for retractor defective Inform internal maintenance department or ABB Service
Compressed-air system leak
•
Probe buggy rails dirty
•
Wrong inclination of probe buggy
Air bubbles in the cooling-water circuit caused by too high
temperature
•
Loose parts
•
Severe soiling of rails
•
Pressure controller defective
•
Incorrect pressure set on pressure controller
Mechanical damage to the tube or hose from an outside
source, or damage caused by too high temperature
(bending, melting, deformation of tubes)
Mechanical damage and thermal stress
•
Mechanical damage
•
Incrustation
•
Severe soiling of rails
Measures
See Checking for leaks on page 108
•
Clean rails
•
Readjust probe buggy inclination using the adjustment
screws, see Probe retractor: Checking and adjusting the
position of the probe on page 118.
Realign probe
•
Check the water flow
•
Check if piping has lime deposits limiting the flow. Use lime
removing liquid in tank, see Cooling module: Checking cooling
water on page 122
Have trained experts find out the cause
•
Close gate valve in pneumatic box, then wait for all
compressed-air to blow out completely before approaching
•
Shut down probe gas sampling system and secure against
start-up until the cause has been fixed
•
Turn off the valves to isolate the leaking section
•
Wait until the water has run out before approaching
•
Shut down probe sampling system and secure against start-up
until the cause has been fixed
•
Do not begin repair work until it has cooled down
•
Wait until all cooling water has run out before approaching
•
Shut down probe sampling system and secure against start-up
until the cause has been fixed
•
Do not begin repair work until it has cooled down
•
Remove the probe form the process
•
Press EMERGENCY STOP switch before working on the probe
•
Remove blockage
73
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