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The purpose of this Resolution is to inform users of 24vdc Momentum I/O Bases that the fusing requirement has changed.
Goals and Symptoms
Using a 315ma fast blow fuse on a redesigned 24vdc Momentum base may cause the fuse to blow when powered up. Since the 24vdc Momentum I/O bases have been redesigned to meet the new EMC and power hold-up requirements, it was necessary to increase the size of the external fusing.
Facts and Changes
The external fusing is indicated in the User Manuals as follows. It does not affect the recommended fusing for the I/O power.
Causes and Fixes
The recommended size of the external fuse for all Momentum I/O modules that are powered by 24 VDC, has changed from a 315ma Fast Blow fuse to a 1Amp Slow Blow fuse (Bussmann GDC-1A or equivalent).
The 1A Slow Blow fuse can be used on both new and old versions of 24vdc powered Momentum I/O bases listed below.
DC Discrete Modules