Sheet 09 — Technical notes
Insights
Short field notes from jobs we attend — the checks, the trade-offs and the ordering mistakes we see most often.
Why your VSD trips on a hot afternoon — four things to check
Ambient temperature, blocked filters, DC bus ripple and cable length. A field checklist before you condemn the drive.
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Managed or unmanaged switches on the plant floor?
Unmanaged is fine for a machine cabinet. The moment control traffic shares a wire with office traffic, you need VLANs.
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Omron CP2E or Mitsubishi FX5U for a small retrofit
I/O count, motion needs, spares availability in Perak, and what your technicians already know how to fault-find.
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Getting a conveyor roller order right first time
Diameter, shaft type, face width, bearing housing. Five measurements that stop a wrong delivery.
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What ST and CIDB registration actually mean
A plain reading of the grades and competencies your electrical contractor should hold before touching your switchgear.
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A spare-parts list that actually shortens downtime
Stock by failure rate and lead time, not by unit price. The cheap part with a three-week indent is the expensive one.
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