Landing/Positioning System
42-02-2M01 A1 2-45
2
Motion 4000
Broken Tape Switch
The normally closed contacts on the Broken Tape Switch are used to detect a broken tape condi-
tion. The switch is mounted backwards for protection during shipment. Remove it and mount it
as shown in Figure 2.10 . Position the switch so that the cam on the tensioner activates (opens)
the switch when the tensioner is at the bottom of its travel (no tension). Note that switch posi-
tion should be adjusted so that the switch is activated by the cam but not so close that the switch
is held against its mechanical stops. The switch activates at approximately 50% of travel.
Hanging the Tape
Work from the cartop to hang the tape from the top hanger and allow it to unroll slowly as you
move the car down the hoistway. It is best to allow the tape to hang and straighten for at least
24-hours before attaching it to the bottom hanger.
Tape Tension The tape is tensioned according to compression of the bottom tape mount
spring. The tension gauge provides visual indication of low, medium, and high tension posi-
tions. Short runs, up to five floors will generally be acceptable at the low tension position. Runs
to 15 floors will generally be acceptable at the medium tension position. Longer runs may
require the high tension position but you should start out with the medium setting first. The
scale values are provided as a guideline only. They are not calibrated. Adjust to suit the installa-
tion.
Tape tension is intended to reduce noise caused by tape vibration at contract speed. Generally,
you want to use the lowest tension setting that maintains a quiet tape at contract speed.
Sensor Installation
Tape guide side pieces easily detach so the sensor can be slipped onto the steel tape. Attach the
sensor to the cartop as shown in Figure 2.12 .
Figure 2.11 Sensor with Guide Sides Removed
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