 |
| Problem |
|
Possible Cause |
|
Possible Solution |
|
| Motor does not start |
|
Supply lead interrupted |
|
Check connections |
|
| |
|
Setting of brush yoke wrong |
|
Adjust neutral zone |
|
| |
|
Current limiting does not respond |
|
Loading too high or increase current limiting |
|
| |
|
Brake does not release |
|
Check brake connection |
|
| Motor speed drops when under load |
|
Overloading |
|
Carry out performance measurement |
|
| |
|
Voltage drops |
|
Adjust neutral zone |
|
| |
|
Setting of brush yoke wrong |
|
Adjust neutral zone |
|
| Motor gets too hot |
|
Overloading |
|
Carry out performance measurement |
|
| |
|
Insufficient cooling |
|
Ensure that the cooling air can enter without hindrance |
|
| |
|
Separately driven fan not running |
|
Check connection of separately driven fan |
|
| |
|
Current ripple too great |
|
Check form factor, if necessary connect armature choke on input side |
|
| |
|
Ambient temperature too high |
|
Reduce performance |
|
| Severe brush sparking |
|
Overloading |
|
Carry out performance measurement |
|
| |
|
Setting of brush yoke wrong |
|
Adjust neutral zone |
|
| |
|
Commutator surface very dirty |
|
Clean commutator |
|
| |
|
Commutator out-of-round or with flat points |
|
Have commutator diameter-turned by specialists |
|
| |
|
Lamellar insulation protruding |
|
Have specialists scrape out of insulation grooves and remove sharp edges |
|
| |
|
Brushes worn out |
|
Insert new brushes |
|
| |
|
Current ripple too great |
|
Check form factor, if necessary connect armature choke on input side |
|
| |
|
Switching error in a section of coil |
|
Have experts carry out checking |
|
| |
|
Carbon brush sticks in holder |
|
Ensure easy running |
|
| |
|
Vibration on the drive |
|
Remove possible unbalance |
|
| |
|
Unsuitable brush quality |
|
Consult the manufacturer, stating the Trouble Shooting data and environmental factors |
|
| |
|
Damage to coil |
|
Get damage removed by specialists |
|
| Brush life too short |
|
Current ripple too great |
|
Check form factor |
|
| |
|
|
|
Connect armature choke on input side |
|
| |
|
Overloading |
|
Carry out performance measurement |
|
| |
|
Current loading of carbon brush too low |
|
Use genuine carbon brushes |
|
| |
|
Commutator surface affected |
|
Find out the causes (dust, oil fumes, chemical active gases etc) and remove it |
|
| |
|
Brushes are of different or unsuitable qualities |
|
Fit the machines with suitable brushes of consistent quality. Use genuine carbon brushes |
|
| Motor produces too much noise |
|
Current ripple too great |
|
Check form factor. Connect armature choke on input side |
|
| |
|
Bearings warped, dirty or damaged |
|
Realing the motor. Clean and grease the bearings or replace them |
|
| |
|
Rotating parts unbalanced |
|
Remove stimulation of vibration and possible armature unbalance |
|
| |
|
Current convertor vibrates |
|
Optimize current converter |
|
| Speed is unstable |
|
Current convertor not set ideally |
|
Optimize current converter |
|
| |
|
Large differences in loading |
|
Increase current limiting or use a more efficient device or motor |
|
| |
|
Tachometer signal not constant |
|
Check tachometer |
|
| Motor accelerates uncontrollably |
|
Error in speed feedback, e.g. tachometer connected wrongly |
|
Connect correct polarity |
|
| |
|
Tachometer carbon brushes worn-out |
|
Replace carbon brushes |
|
| |
|
Tachometer lead interrupted |
|
Lay a new tachometer lead |
|
