Download In This Section - Motion Control Engineering, Inc.

Operation, Preinspection, OEM Inclusions
Car Locking Bolt Operation
With the machine and governor located in the overhead, it is necessary to provide a means to
lock the car in position and inhibit machine and brake operation so that maintenance can be
safely completed from the car top. Refer to Car Top Locking Bolt, MRL Applications on page 350 for mechanical information.
Danger
Suspension ropes must be in place when using the car locking bolt.
1. Run the car to the top landing.
2. Prevent access to the car by unauthorized personnel. Post warnings and place barriers
as required.
3. Using the key switch in the car, place the car on ACCESS.
4. Move to a safe position in the hallway and use the hoistway access switch to move the
car down to the access limit.
5. Using the car top switch, place the car on car top INSPECTION.
6. Observing all safety precautions, step onto the car top.
7. Use car top controls to move the elevator up adjacent to the car locking device.
8. Engage the locking bolt in the center of the bolt hole in the receiver. This will activate a
switch, opening the safety circuit and preventing the car from moving.
The car is now prevented from moving by the locking device. Reverse the above steps to return
the car to normal service when maintenance is complete.
Figure 5.1
Car Locking Bolt Use
Lift, slide, and set to
lock the car in position
Receiver on guide rail
Cartop Access
While the locking bolt is engaged, you may access the cartop through the escape hatch. Be sure
to have a step ladder positioned appropriately in the car and a second step ladder in the hall for
safe exit and re-entry.
5-2 Manual # 42-02-EP01