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Excessive Static from Slip Sheet Removal Bin

Device

   Magnus VLF MCU

Component

   Slip sheet removal (SSR) bin

Error

   Excessive static

Symptoms

   Operators report getting shocked by touching the SSR bin handle and possibly the cassettes when reloading.

Cause/Solution

   Cause: Static build-up during the automatic SS removal process due to improper grounding of the SS bin area.
Solution: Check the grounding cable, the contact bracket on the MCU and the contact plate mounted of the back of the removable SS Bin.
  1. Open the rear door for the SSR unit area, but leave the removable bin inside the SSR area.
  2. Locate the ground cable running at the back of the SSR area. It will be located beneath the plenum float cylinder, and near the SSR rear door Omron.
  3. Ensure the ground cable is connected and a proper star grounding washer is being used.
  4. Inspect the vertically mounted grounding bracket that the ground cable is attached to, make sure it is not damaged or bent. It should be holding the removable bin in place by clipping onto a black wheel.
  5. Beside the black wheel on the removable SS bin that is clipped into the vertical bracket, locate a small steel/metal tab with two sheet metal grounding screws holding it to the SS bin frame. This small tab should be making contact with the vertically mounted ground bracket on the MCU. Ensure the tab is there and making proper contact (not bent or damaged). If this tab is not located, you may find it on the opposite side, not completing the grounding connection (incorrectly assembled from the factory).
  6. If the tab is installed improperly, remove it from the wrong side and re-install it on the MCU side of the SS bin, ensuring it makes good contact with the grounding bracket on the MCU.

Practical cases

   Operators at a site were reporting excessive amounts of static discharge into their hand as they tried to remove the SS bin from the system. The problem was quite pronounced and was decribed as follows: “It was like a tazer gun going off. The arc was an inch long and could be heard 10 feet away”

Technical contact(s)

   Chris Bradley

Submitted by

   Chris Bradley

Date submitted

   24 Oct 2006

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