KONE Maintenance Method
MX10 / MX20 MCP Procedures - ASME A17.1-2013 / CSA B44-13
© 2014 KONE Corporation PSK8-604-MX10/MX20
All rights reserved.
91 (-) 2014-12-15
Category 5 Overspeed Counterweight Safety Test
3) Move the elevator to lower part of the hoistway.
4) Put the elevator on machine room inspection by putting switch 270 DOWN.
5) Turn off controller power and lock and tag disconnect.
6) Disconnect the motor leads at U, V, W in controller.
7) Manually open the brake.
• Counterweight will drop and safeties will set.
8) Reconnect the motor leads at U, V and W in controller.
1) Prepare elevator for counterweight safety test by
performing following steps:
• Tie down the car safeties so they do not accidentally
set during the safety test.
• Tie up door restrictor so door can be opened without
the hall door being present.
• Block clutch open using blocking screw provided
with clutch.
• Tie down the governor tail sheave for both the car
and the counterweight so they cannot jump out of
the bracket when the safeties set.
• Make sure there is no person on the elevator, and
the car is empty.
2) Disable hall calls and car calls by sliding LCECPU
switches 263 and 261 to left.
Note: Ensure no passengers are in car.
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