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 TM 5-684/NAVFAC MO-200/AFJMAN 3 2 - 1 0 8 2
Table 11-2.
Troubleshooting chart for general control equipment (continued)
Trouble
Cause
Course of action
Remove grease or oil.
2. Grease or oil on brake wheel.
Failure to set.
1. Out of adjustment; worn parts, mechanical
Replace worn parts and adjust them.
binding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Coil not de-energized.
Examine brake and check circuit to make sure
current is cut off.
See manufacturer's instructions.
Failure to release
1.
Out of adjustment.
2.
Coil not energized; low voltage or current.
Check connections.
3.
Wrong coil.
Check with manufacturer as to correct coil.
See manufacturer's instructions.
4.
Shorted turns or coil open
Check to see if coil is getting correct voltage or
5.
Coil not energized; low voltage or current.
current.
6. Open coil or shorted turns
Replace coil.
VALVES:
Electrically-operated, solenoid,
thrustor, or motor-operated, leaks
and mechanical failure
1. Worn valve seal.
Replace seal or valve.
Check application; use strainer ahead of each
2. Abrasive matter in fluid
valve.
3. Corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remove corrosive elements from fluid, or get
manufacturer's recommendations.
1. Same as for noisy magnet.
See noisy magnet.
Noise
Install surge tank.
2. Water hammer.
THRUSTORS:
Failure to more load
...
1. Worn parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replace worn parts.
2. No voltage on motor.
Check circuit and connections.
3. Misapplication.
Get manufacturer's recommendations.
THERMOSTATS:
Bulb and bellows type, with
expanding fluid, bellows
1. Mechanical binding.
distorted
Clean and adjust.
2. Temperature too far above normal.
Replace bellows.
1. Liquid frozen in capillary tube, or tube
1
Replace bulb and bellows assembly.
Bulb distorted
stopped up..
RESISTORS:
1.
Insulation failure
See insulation failure.
See insulation failure.
Install larger resistor.
Overheating.
1.
Rating too low
Check the timer to make sure it operates.
2.
Running on starting resistor
3.
Restricted ventilation.
Relocate.
Open circuit.
1.
Burned out from overheating.
Replace resistor and see above.
Relocate or correct atmospheric conditions.
2.
Corrosion, moisture, acid fumes,
Replace worn or broken parts.
3.
Mechanical damage
RECTIFIERS-DIODES:
Dry type, overheating
1. Overvoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Correct system voltage.
2. Overcurrent, intermittent-rated unit left
Check operation of circuit and application.
on continously
3. High ambient.
Relocate unit or correct condition.
Get manufacturer's recommendation.
4. Misapplication.
Same as for overheating.
Failure burnout or breakdown
1. Overheating, corrosive atmosphere,
overvoltage, mechanical damage
CAPACITORS:
Breakdown or failure of dielectric
1. Overvoltage.
Check system voltage.
2. Voltage surges caused by switching or
Install protective equipment.
lightning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Some types not usable on ac..
Check applications.
Correct condition, or install special unit.
4. Moisture, corrosion, or high temperature.
Install proper unit.
5. Continuous voltage on intermittent-rated
unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6. Mechanical damage..
Replace capacitor.
7. Wrong polarity on dc unit.
Replace capacitor and reconnect, changing po-
larity.
FUSES:
Premature blowing.
1. Fuse too small..
Check application.
11-12
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