9 Troubleshooting
9.1
Operational issues and their solutions
Faults
Possible causes
Required measures
The clutch does not engage
The electric supply is not working prop-
erly
Check the fuse,
check the electrical supply, measure
the coil current, check that carbon
brushes or plugs are arranged correct-
ly, verify switch and relay contacts
if present, check the multiplier for fail-
ure, check brush running surfaces on
the slip ring for damage
Coil failure
Contact Stromag’s Customer Care de-
partment
Air gap is too big
Check or adjust the air gap
Magnetic coil defective
Measure the coil resistance and re-
place the coil body if necessary
Disc or toothing guides incorporated,
discs jam
Replace disc pack and/or outer body
and coil body
Clutch does not disengage
Discs jam
Replace disc pack and/or outer body
and coil body
Air gap is too small
Adjusting the air gap
Contact on the contactor is burnt
Install over-voltage protection or check
that which is already installed, replace
the contactor
The clutch slips during operation
Insufficient voltage or when voltage is
cut off temporarily
Adjust the nominal voltage (measure
clutch slip rings or plug connections),
verify contacts and over-voltage resis-
tances, check brushes - if oscillation
and significant oil content is detected
arrange two brushes per slip ring
Load torque is too high
Measure load torque, control bearing
positions
There is no longer an air gap present
Adjusting the air gap
Friction surfaces are not grease-free
when the clutch is in dry operation
Degrease the friction surfaces
Coil is burnt
Coil voltage is too high
Measure the voltage, if necessary ad-
just it correctly;
Arrange for Stromag to replace coil
Clutch was engaged without over-volt-
age protection (winding short circuit/
short circuit to earth)
Contact Stromag’s Customer Care de-
partment
Significant slip ring wear; brush wear
Circumferential speed of slip rings rela-
tively high
Arrange three brushes per slip ring
Brushes slip
Check concentric run of slip rings. If
oscillations are detected in drive, ar-
range two brushes at approx. 90° off-
set per slip ring
Dirt accumulation on slip rings during
operation
Seal slip rings, eliminate contamination
cause
Inadequate surface pressure of brush-
es
Correct brush pressure
42
Mounting instructions Electromagnetic multi-disc clutch EKE/EKB, EDE/EDB • No. 500-00000 C • 10/2017
Summary of Contents for EDB Series
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