Warner Electric AT Clutches - Manual (Page 6)

6 Warner Electric • 800-825-9050 P-217-1 • 819-0372
AT 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 Autogap.
• Autogap
Assure that clutch rotor is free to move on hub spline and releases
approximately .050'' when pressure is removed.
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.
Approx. Coil Approx. Coil
Clutch/Brake Size Coil Voltage Resistance (Ohms) Coil Voltage Resistance
25 6 1.4 24V 20.2
90 290
55 6 1.2 24V 19.6
90 230
115 6 1.0 24V 16.5
90 180
205 6 1.02 24V 13.2
90 169
305 6 1.05 24V 14.4
90 183
Chart 1