Module 1 · Lesson 3

Industrial components and control-panel anatomy

Recognise switchgear, contactors, relays, overloads, terminals, power supplies, barriers and panel segregation.

Learning outcomes

Explain the key principles of industrial components and control-panel anatomy.
Carry out a structured practical check or configuration task.
Recognise common faults, risks and evidence needed for diagnosis.

Before you begin

A de-energised panel, component catalogue or high-quality panel photographs.

Safety: Use site procedures, approved test equipment and competent supervision. Never bypass a protection or interlock without formal control.

Step-by-step learning

Identify incoming isolation, protection, control supply and outgoing feeders.
Follow wire numbers from field terminals to relays, PLC I/O and devices.
Check segregation of ELV, control, analogue and motor-power wiring.
Confirm labels, terminal markers and drawings agree with the physical panel.

Ian's practical tips:

Good labels reduce fault-finding time more than almost any clever software feature.
Keep spare terminals and cable space for future modifications.

Fault-finding questions

What should be happening, and what evidence proves it?
Where is the last known correct signal, voltage, state or process condition?
What changed immediately before the fault?
Can the system be divided into smaller testable sections?

Practical activity

Create a one-page test record for this lesson. Include expected values, measured results, equipment used, risks controlled, defects found and the final proven condition.

I completed the lesson activity. I checked the result safely. I can explain the fault-finding approach.