9
3. Inspection
At regular intervals, check that:
a. the unit is operating normally.
b. the brake lining is not excessively worn (or gap G
is normal).
c. all the mounting screws are securely tightened.
4. Gap Inspection
The brake lining will wear after the unit has been used
for a long period of time. Regularly check that gap G
(Fig. 17) is at an acceptable value. If gap G becomes
too large, the solenoid coil may fail to pull in the
armature plate, and hence cannot release the brake,
resulting in the unit remaining in a continuously braked
condition. Follow these steps to inspect the brake gap:
a. Remove the cover (7).
b. Insert a gap gage into the space between the
stationary core (1) and armature plate (11).
Measure the gap size at three appropriate
circumferential points.
c. The gap needs to be adjusted if the values are
close to the allowable limit listed in Table 10.
5. Gap Adjustment
If the brake lining is so heavily worn that gap adjustment
is required, follow these steps:
a. Remove the cover (7).
b. Loosen the restraining bolt (4), rotate the brake
shoe one complete turn counterclockwise and
retighten the restraining bolt (4). After tightening
the restraining bolt, measure the gap G to verify
that it falls between the specification value and
the allowable limit shown in Table 10. (This
procedure reduces the gap approximately 0.012
inch.)
c. Turn the system power on and off a few times to
check the brake performance.
d. Replace the cover (7).
Brake Models FB-1B, FB-2B and FB-3B
1. Standard Brakemotor Specifications
Table 12 lists the standard specifications for Models
FB-1B, FB-2B and FB-3B.
Table 11 Brake Lining Size
Brake Initial
Brake Type lining thickness
dimension t
o
(in)
FB-01A
FB-02A 0.276
FB-05A
Brake Type
Gap value G (in)
Spec. value Allowable limit
FB-01A
FB-02A 0.006 ~ 0.010 0.020
FB-05A
Table 10 Brake Gap Size
Table 12 Models FB-1B, FB-2B, FB-3B Standard Specifications
Brake Motor
Brake Inertia
Brake
Brake Current
Coil
Brake Delay Time
Type HP
Torque WK
2
Coil
(A)
Resis
(seconds)
ft-lb lb-ft
2
230V 460V
ohms
Normal Fast
FB-1B
3/4 5.8 0.0267
DC Energized
0.1 0.06 1470 0.2 ~ 0.3 0.01 ~ 0.02
1 5.8 0.0308
Type, Built-in
FB-2B
1.5 11 0.0504
Rectifier within
0.3 0.2 589 0.2 ~ 0.3 0.01 ~ 0.02
2 11 0.0558
Conduit Box
FB-3B 3 16 0.0884 0.3 0.2 589 0.3 ~ 0.40 0.01 ~ 0.02
Notes:1) Continuous time rating for both the brake and motor.
2) Indoor types can be installed for use in any orientation.
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