Topic:  Metop-B HIRS Filter Wheel Current Increase Event

Date/Time Issued: May 28, 2020 2042Z

Product(s) or Data Impacted:  HIRS Products

Date/Time of Initial Impact:  May 27, 2020 2240Z

Impacts on Users and Significance:  HIRS products are affected.

Date/Time of Expected End:  Unknown

Length of Outage:  Ongoing

Details/Specifics of Change:

The Metop-B HIRS Filter Wheel Motor current began showing signs of instability at approximately 2137 UTC on May 27, 2020.  At 2143 UTC it saw a large spike in current up to 476mA, then dropped to about 270mA, where it remained until 2240 UTC.  At that point, it spiked again to 418mA before ramping down to ~380mA where it has remained since.  The Filter Wheel Motor Temperature has since stabilized at ~30°.

This behavior is consistent with a filter wheel stall, but requires further investigation.  Options for recovery include putting the instrument into High Power mode but are otherwise limited.

Contact Information for Further Information:  ESPC Operations at at 301-817-3880 and/or other contacts as necessary

Web Site(s) for applicable information:  N/A

This message was sent to  You have been sent this and other notifications because you have opted in to receive it. If for any reason, you wish to unsubscribe, please contact ESPC Help Desk at or (301) 817-3880.  Please note: it make take up to two business days to process your unsubscribe request.