Warner Electric ER-1225 - Manual (Page 10)

10 Warner Electric • 800-825-9050 819-0466
Step 10: Using a torque wrench, tighten the hub
bushing screws (Item 12) alternately and
evenly until tight . Place a drift against
the large end of the bushing at several
points around the circunference and
tap it lightly with a small hammer . (See
Figure 11) Repeat this alternate tapping
and re-tightening until the specified
torque no longer turns the screws
after tapping . Tighten the screws to
15 lb .ft . torque . The gap between
armature and magnet must be 0 .062”
to 0 .125 inch . If the gap is outside of
that range, reposition the armature hub
assembly as described in Steps 11 & 12;
otherwise, go to Step 13 .
Figure 11 - Seating the taperlock bushing.
Step 11: Apply power (90 VDC) to release the
brake . Remove the taperlock bushing
and armature assembly (Items 1,2,3)
from the motor . With a hex key wrench,
remove both set screws (Item 12) from
the taperlock bushing (Item 1) . Insert one
set screw into the previously vacant hole
in the taperlock bushing and tighten this
screw until the bushing is loosened in
the hub (Item 2) . If the bushing does not
loosen, tap on the hub with a drift and
small hammer .
Do not pry the armature away
from the magnet. This can distort the
armature and require complete brake
replacement.
Step 12: Repeat Steps 6, 7, 8, 9, &10 .
Step 13: Make the electrical connections . Apply
power (90VDC) to the brake and remove
the shims . Set the airgap by pressing the
armature into contact with the magnet
and then releasing as shown in Figure
12 . The armature should spring back
approximately 3/64 ( .045) inch when
power is applied to the magnet .
Keep fingers away
from this area
Figure 12 - Setting the airgap.
Step 14: If the brake includes temperature and
wear sensor wires, follow KONE Inc .
instructions to make proper connections .
Color coding is as follows:
Yellow wires - temperature sensor
Red wire - 90% wear sensor
Black wire - 70% wear sensor
Step 15: Burnish the brake as follows: Start and
stop the escalator 30 times . Allow 5-10
seconds delay between each start and
stop .
Step 16: With power off, check brake static
torque, which must be at least 125 lb .ft .
If less, repeat Step 15 . If the brake does
not meet the torque requirement after
two burnishings, replace it .