Wiring Diagrams - Yale HOISTS YEL Series Operating, Maintenance & Parts Manual

TROUBLE SHOOTING CONTINUED
Lack of proper lifting speed
1. Hoist overloaded
2. Brake dragging
3 Low voltage
4. Overload limiting clutch intermittently slipping
Motor brake noise or chatter (while starting hoist)
1. Brake needs adjustment
2. Low voltage
Motor brake "buzz" (anytime hoist is running)
1. Brake needs adjustment
2. Broken shading coil on brake frame
Figure 9A — Wiring Diagram for 115/230V - 1 Phase Models
1. Reduce load to within rated capacity of hoist.
2. Check for proper brake adjustment or other defects.
3. Ensure that the voltage at the reversing contactor is within ±10% of the nominal voltage while lifting a load.
4. Replace overload clutch assembly.
1. See BRAKE ADJUSTMENT, page 9.
2. Ensure that the voltage at the reversing contactor is within ±10% of the nominal voltage while lifting a load.
1. See BRAKE ADJUSTMENT, page 9.
2. Replace shading coil or complete brake frame assembly.
13
Country Club Road
P.O. Box 779
Wadesboro, NC 28170 USA
TEL: (800) 477-5003
FAX: (800) 374-6853