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Message ID: 64     Entry time: Wednesday, February 14, 2024, 09:02
Author: Adam Newsome 
Category: T-Hall Crane 
Type: Maintenance 
Subject: Target Hall Crane: Trolley Encoder Homing 

The main trolley's E/W motion was observed to be slowed on 2024-02-13.
Upon investigation, the following faults were present:
- 200. Rotating Hook Velocity Difference between SSI Encoder and Drive Speed Feedback
- 82. Main Hoist Slack Rope

It is suspected that these faults are irrelevant in this situation. Upon inspection of the main trolley status screen, it was evident that both the SLOW EAST and SLOW WEST indicators were on (which matches observations). Clicking one of these status icons showed "Main Trolley Encoder Not Homed 2253ENC".

Logging in as an administrator allowed for homing the encoder.

The trolley was moved all the way East, to the limit, and the encoder was homed at position 0.389m (encoder count = 6886940). Note: the alignment arrows were not used as this would have required gaining access to the crane which was difficult at the time. It is suggested to properly home it in the future.

The E/W motions were fully tested to confirm proper slow down and stopping at the expected positions. The crane appears to be operational as of 2024-02-14.

 

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