Warner Electric ATT Tension Brakes - Manual (Page 8)

8 Warner Electric • 800-825-9050 P-221 • 819-0338
ATT Brake Troubleshooting Guide
In performance problems are present after carefully following the instructions in this manual, use the following
check list.
Symptom Check
Brake armature will not move or • Coil Resistance
engage when power is applied Coil may be open. See Chart 1.
to the coil. • Power Supply
Assure proper DC voltage is being delivered to the brake.
• Airgap
If greater than 3/32" gap around entire periphery, reset.
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.
Low Tension • Power Supply
Assure proper DC voltage is being delivered to the brake.
• Adequate Burnishing
Unit must be run and cycled a few times to achieve full rated torque.
• Friction Surfaces
Replacement may be required.
• Installation of replacement friction material or armature segments may be
incorrect and not allow full contact.
Clutch/Brake Coil Approx. Coil
Size Voltage Resistance (Ohms)
25 24 20.6
25 90 290
55 24 19.6
55 90 230
115 24 16.5
115 90 182
Chart 1