11
Table 15 Brake Lining Size
Brake Initial
Allowable
Brake Type lining thickness
thickness
dimension t
o
(in)
limit
t
o
(in)
FB-1B 0.276 0.236
FB-2B 0.322 0.283
FB-3B 0.354 0.315
Table 16 Models FB-5B, FB-8B 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-5B 5 27 0.0227 0.7 0.3 308 0.4 ~ 0.5 0.01 ~ 0.02
FB-8B 7.5 40 0.0297 0.7 0.3 308 0.3 ~ 0.4 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.
DC Energized
Type, Built-in
Rectifier within
Conduit Box
5. Gap Adjustment
If the brake lining is so heavily worn that gap adjustment
is required, follow these steps:
a. Remove the cover (12). Measure the gap size to
confirm the deviation from the specification value.
The minimum adjustable setting is no less than
the thickness of the Gap adjusting shim, 0.008 in.
b. Loosen the set pin (13) and remove the fan (14).
c. Slightly loosen the restraining bolt (7) and remove
parts (4), (5), (7) and (15) as a set. Be careful not
to remove only the bolt (7) and lose the shims (5).
d. One gap adjusting shim (5) is 0.008 in. thick.
Decrease the number of shims in use according
to the degree of wear (Note: Retain the
removed shims for use during the brake lining
replacement procedure). Reassemble parts (4),
(5), (7) and (15) as a set.
e. Once reassembled, check gap G. If the gap size
is still too large, adjust the number of shims again.
f. After completing the gap adjustment, turn the
system power on and off a few times to check the
brake performance.
g. Replace the fan (14), set pin (13) and cover (12).
6. Brake Lining Replacement
Follow these steps to replace the brake lining when its
thickness has reached the allowable limit shown in Table
15, or when sleeve adjustment is no longer an effective
means of gap adjustment:
a. Remove the cover (12) and measure the gap G.
Remove the set pin (13) and the fan (14).
b. Slightly loosen the restraining bolt (7) and remove
parts (4), (5), (7) and (15) as a set.
c. Remove the brake lining (8), taking care to
prevent the leaf spring from coming off.
d. Install the new brake lining, taking care not to
damage or remove the leaf spring (9). Ensure
that the lining moves smoothly along the hub (10).
e. Replace any gap adjusting shims removed and
retained from previous gap adjustments. Then
reinstall parts (4), (5), (7) and 15 as a set.
f. Measure gap G. Readjust if the gap is not within
the specification value range.
g. Turn the system power on and off a few times to
check the brake performance. If no abnormalities
are detected, replace the fan (14), set pin (13)
and cover (12).
Brake Models FB-5B and FB-8B
1. Standard Brakemotor Specifications
Table 16 lists the standard specifications for Models
FB-5B and FB-8B.
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