DURING A NORMAL ROUTINE MAN TRIP AT SHAFT #2, THE HOIST 4703 TRIPPED OUT BELOW THE 900' LEVEL. THE HOISTMAN RESET THE HOIST. THE HOIST TRIPPED OUT SEVERAL MORE TIMES BEFORE ARRIVING AT THE COLLAR. ELECTRICIANS WERE CALLED. THE ELECTRICIANS PUT THE FIELD MOTOR ON A NEW BREAKER. HOIST CHECKS WERE COMPLETED. ALL O.K.