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