Beta Max MAXIAL TRACK HOIST, Инструкция по эксплуатации и обслуживанию

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Use and Maintenance Instruction Manual
MAXIAL TRACK HOIST
REV. 2.2 (2017)
MAINTENANCE AND REPAIR
Page | 10-10
10.3.6 Motor and brake
The Maxial Track Hoist utilizes a conical braking system. The conical braking system is a fail
safe system that provides safe load handling at any lifting position and securely holds the
load even when electrical power is lost. This system operates from the inductive forces in the
rotor created by the AC current through the stator wires.
When voltage is applied to the rotor, the induced magnetic force compresses the tension
spring and pulls the brake free from the motor end cap this allows the hoist motor to turn.
Conversely, when the magnetic force is absent, the brake is pushed back into the brake end
cap by the force of the tension spring and holds the workload securely. Brake load holding
force is the force applied between the brake surface and the motor end cap, which is the
result of the amount of tension on the tension spring.This prevents the load from free-falling
or slipping when the hoist is not lifting or lowering.
Through normal hoist operation and wear, the brake may occasionally need adjustment. The
reasons for performing adjustment are listed below.
—
Hoist will not lift the load from a stopped, suspened position.
—
Hoist will operate in the up direction without a load, but will not lift a normal-rated load.
—
Without a load attached, hoist will not respond to either the UP or DOWN push buttons
when they are released.
—
A normal-rated load slips downward when the hoist is stopped.
If the brake needs adjustment, there are only two adjustments available. One is the tension
spring adjustment (brake tension) and the other is the air gap adjustment (brake air gap). The
tension spring adjustment controls the amount of force applied to press the brake into the
brake end cap and provides load-holding ability. The air gap adjustment sets the distance
between the rotor and the motor end cap. The correct air gap setting is important because it
has a direct influence on the magnetic force required to pull the brake away from the motor
brake end cap. If the gap is too great, the magnetic force will be too weak to disengage the
brake and the load will not move. If the gap is too little, the magnetic force will be too strong
and the load may not stay in place when the hoist is stopped.
Air gap and tension are two separate adjustments, yet interrelated. This means a change in
one will affect the other. As an example, if the air gap is over 0.30 inches (7.62mm) and the
tension adjustment locknut is excessively tightened, the magnetic force cannot overcome the
tension across the air gap, and the brake will not release.
DANGER
Brakes should only be adjusted by a factory trained certified Beta Max
technican.