Technical Bulletin

Allen-Bradley Auxiliary Contacts used with 12-Pulse Drive on IMC-SCR and IMC-PERFORMA Control Systems

Advisory

Date

January 23, 2002

Reference

126

Route to

Service Manager/Modernization Manager

From

MCE Technical Support Department

Description

Intermittent car shutdown with a fault log entry "No Response for Run Request."

Details

MCE has recently discovered that Allen-Bradley experienced a manufacturing anomaly on their auxiliary contacts used with MCE's 12-Pulse drive. The contact material in a small number of auxiliary contacts does not have enough "wipe" to make with 100% reliability. The result is an intermittent contact that can cause the fault described above. Allen-Bradley has remedied this situation and all controllers shipped from MCE beginning in 2002 will have the corrected auxiliary contacts.

Action

f you are experiencing the fault described above, please call MCE Technical Support for troubleshooting assistance. MCE will provide replacement auxiliary contacts once the diagnosis has been confirmed.

Help

Should you require additional technical assistance:

• Telephone 916/463-9200
• Touch "6" for Technical Support
• Refer to the reference number above