Work through this checklist before replacing a 3500 Monitoring System unit — most field symptoms trace to wiring, grounding, or configuration rather than a failed module.
Key points at a glance
- 3500/42M monitors radial and axial vibration in 4 channels per module
- Rack configuration lives in the 3500/20 interface — spare cards restore in minutes
- The 3500/25 keyphasor provides the phase reference the whole rack relies on
- 3500/32 relays convert alarms into hard-wired trips
- 3500/92 gateway and 3500/22M TDI connect the rack to DCS and System 1
Swap-test with the configured spare last: if the symptom follows the module, order the replacement; if it stays, the problem is in the loop.
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