Firm tests everything but brakes on Coors escalator??greenspun.com : LUSENET : Elevator Problem Discussion : One Thread |
Hi All,I read this article in today's Denver Post...
I have one or two comments...
First, a static load test to test the ability of the brake to hold a load should be performed before the brake is readjusted or disassembled or in any way altered..
All power would be locked out. A safety retraint would be applied to limit the escalator break-away travel to a few inches. The brake torque settings would be recorded for the record.
Load in the form of test weights would be applied (suggest 200 lbs. per step, initially) until the brake slips...
The actual applied load would be recorded for the record. (Some load could be removed, the safety restraint adjusted to allow a few more inches of slip, and the test repeated, until all parties agree that a certain static load will cause the escalator brake to the slip.)
This test could be repeated on all the similar escalators at Coors Field and any differences recorded.
Secondly, the weights should be removed, the safety restraint removed, power restored, and the escalator could then be made "operational" for test purposes.
A temporary limit switch could be installed to simulate tripping any of the escalator safety devices. This switch could be arranged to stop the escalator as a weight placed on a downward travelling step approaches the limit switch.
Then the escalator could be run short test distances up and down, measuring the slide through the brake from point of switch contact to actual stop.
The steps could then be gradually loaded and the test repeated to see if the slide increases measureably, and all parties could then witness and agree when the applied load is sufficiently great enough to cause increased measurable slip.
The actual load applied could then be recorded.
This test could be repeated on all the similar escalators at Coors Field and any differences recorded.
Controlled condition testing should establish the condition of the escalator and the escalator brake without placing any of the personnel in any peril.
Controlled condition testing should establish the condition of the escalator and the escalator brake without damaging or overstressing any of the escalator equipment.
Safety is paramount.
Best regards, Murray Charters
-- Murray Charters (mcharters@novus-tele.net), July 25, 2003
Hi All,I've been reminded that there are high tech test methods too...
cheers ...... murray
-- Murray Charters (mcharters@novus-tele.net), July 26, 2003.