Update 2022-10-06: During routine inspection of the crane, Tom Kauss investigated the direction swap issue. It was determined that there was likely an issue with the initial installation of the new VFD back in March 2022, and that it was unnoticed (directional control wires crossed). The issue has been resolved by Tom Kauss and is no longer a concern. 

It was observed during operation today (Aug. 23, 2022) that the motion axes were reversed for East/West travel on the North Aux Hoist. i.e. when pressing the joystick on the local pendant in the East direction, the hoist traveled West, and vice-versa. This behaviour was not noticed (or at least not reported) before. It could potentially be related to the recent replacement which was done in March 2022 (https://elog.triumf.ca/TIS/RH-ARIEL/52), although the motion was checked after replacement. It is possible that an oversight was made in the testing at that time though.

The controls should be checked and the issue should be rectified as soon as possible. The Aux Hoist controls are not run through the PLC, but rather handled directly within the hoist's control box. It is recommended to go online with the PLC and check if there is any hint as to why this is occurring, before making any modifications. If no info can be gained, it is recommended to try swapping the VFDs for East and West motion, and check if that rectifies the issue. It is possible that the VFDs are programmed specifically for their direction output, and they simply need to be swapped.