Edition: 11/2007
Technical Instructions
Commissioning and Maintenance Guide
TAM 00 526
Page 12 / 18
3.5 Operating Disturbances
Error Possible Cause Removing the Source of the Error
Motor doesn't start Supply lead interrupted Check connections
Setting of brush yoke wrong Adjust neutral zone
Current limiting doesn't respond Loading too high or increase current
limiting
Brake doesn't 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 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
Vibrations on the drive Remove possible unbalance
Unsuitable brush quality Consult the manufacturer, stating the
technical 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 cause (dust, oil fumes, chemi-
cally active gases, etc.) and remove it
Brushes are of different or unsuitable
qualities
Fit the machines with suitable brushes
of consistent quality. Use genuine car-
bon brushes
Motor produces too much noise Current ripple too great Check form factor. Connect armature
choke on input side
Bearings warped, dirty or damaged Realign 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. tachome-
ter connected wrongly
Connect correct polarity
Tachometer carbon brushes worn-out Replace carbon brushes
Tachometer lead interrupted Lay a new tachometer lead
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