Warner Electric Advanced Technology Tension Clutches - Manual (Page 15)

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Warner Electric • 800-234-3369 819-0339
ATT Clutch Troubleshooting Guide
If performance problems are present after carefully following the instructions in this manual, use the
following checklist.
Symptom Check
Problem Possible Cause
Clutch Rotor will not move or engage when • Coil Resistance
power is applied to the coil Coil may be open. See Chart 1.
• Power Supply
Assure proper DC voltage is being delivered to the clutch.
• Airgap
If greater than .050” around entire periphery, reset gap.
Vibration • Runout
Assure that shaft on which the clutch is mounted doesn’t have
excessive runout.
• Shaft Engagement
Assure adequate shaft length and diameter engagement in the hub.
Excessive Start or Stop Times • Power Supply
Assure proper DC voltage is being delivered to the clutch.
• Adequate Burnishing
Unit must be run and cycled a few times to achieve full rated torque.
• Friction Surfaces
Replacement may be required.
• Friction Surfaces
Installation of replacement friction material or armature segments
may be incorrect and not allow full contact.
Clutch/Brake Size Coil Voltage Approx. Coil Resistance (Ohms)
25 24 20.6
90 290
55 24 19.6
90 230
115 24 16.5
90 182
Chart 1