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 TM 5-684/NAVFAC MO-200/AFJMAN 32-1082
Table 11-2. Troubleshooting chart for general control equipment (continued)
Course of action
Cause
Trouble
Use heavier fluid or close vent slightly or regu-
2. Same as above, except fluid dry or too
late temperature. Dashpots should be cleaned
light. Vent too large or temperature too high.
periodically and refilled with new oil.
Check rating with manufacturer's instruction
1. Wrong size of heater.
Thermal type.
sheet.
Clean and adjust relay.
1. Mechanical binding; dirt, corrosion, etc..
Failure to trip causing motor
burnout.........................
2. Relay damaged by short circuit.
Replace relay.
Install motor and control near to each other, or
3. Motor and relay in different ambient tem-
make temperature uniform for both. Use
peratures..................................
ambient-compensated relay.
Check rating with manufacturer's instruction
1. Wrong heater..
Trips at too low temperature.
sheet.
2. Assembled wrong..
See instruction sheet.
Install controls closer to each other, or make
3. Relay in high ambient temperature.
temperature uniform. Use ambient-
compensated relay.
Consult manufacturer.
4. Wrong calibration.
Replace broken parts, clean, and adjust.
Failure to reset.
1. Broken mechanism; worn parts; corrosion,
dirt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
In general, use fuses of not over 10 ampere
1. Short circuits on control circuit with too
Burning or welding of control
rating.
contacts and shunts.
large protecting fuses
Remount control.
2. Severe vibration
Clean and adjust.
3. Dirt, corrosion
Reduce current or get manufacturer's recom-
4. Misapplication, current too high.
mendations.
TIMING RELAYS:
Mechanical escapement type,
Clean and replace worn parts.
1. Abrasive dirt.
mechanical wear or broken parts
Get manufacturer's recommendations.
2. Wrong application.
3. Very heavy service cycle
Get manufacturer's recommendations.
Clean and lubricate moving parts; replace
1. Dirt; corrosion; moisture; lack of lubrica-
Jamming or sticking
worn or broken parts. Correct condition.
tion; worn or broken parts.
Clean.
1. Dirtinairgap.. . . . . . . . . . . . . . . . . . . . . . . . . .
Decay of flux type, too short time
Replace with thinner shim.
2. Shim too thick.
See instruction book.
3. Excess spring and tip pressure.
Correct alignment and remedy with cause.
4. Misalignment.
Replace with heavier shim.
1. S h i m w o r n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Decay of flux type, too long time
See instruction book.
2. Weak spring and contact pressure. Gum or
Clean and adjust.
dirt on magnet faces, or mechanical binding..
Clean.
1. Dirt or gum in air gaps.
Magnet-operated capacitor type,
too short time
2 High spring and contact pressure..
See instruction book.
Magnet-operated capacitor type,
Clean and adjust.
1
too long time
Mechanical binding or sticking.
Replace.
Worn shim. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
See instruction book.
Weak spring and tip pressure.
3
Chck manufacturer.
4
Too much capacitance or resistance.
Replace parts and adjust them.
1.
Worn or broken parts.
Motor-operated type, failure to
time out.
Clean.
2. Corrosion, dirt..
Check condition of motor electrically and me-
3. Motor damaged.
chanically.
4. No voltage on motor.
Check circuit.
Failure to reset
1. Worn or broken parts; corrosion, dirt
Replace parts and adjust.
BRAKES:
Magnet-operated or thrustor-
operated, worn or broken parts
See magnets and other mechanical parts.
1
2. Heavy duty cycle, high inertia loads, ex-
Check application. A larger or different type
brake may be needed.
cess temperature, rough surface on wheels,
misapplication.
1. Worn parts, out of adjustment, wrong fric-
Replace worn parts.
Failure to hold load
tion material used for replacement.
11-11
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