Electrical Safety & Testing
Technical knowledge hub
Industrial Electrical Advice & Fault Finding Guides
Practical diagnostic thinking for maintenance and engineering teams dealing with machinery electrical faults, PLC-controlled equipment, motors, drives, sensors and control circuits.
Topics covered
Industrial Fault FindingPLC & ControlsMotors & DrivesSensors & InstrumentationMachine BreakdownsIndustrial MaintenanceControl PanelsElectrical Safety & Testing
Latest guidance
Follow the evidence.
Understand the fault.
These guides explain likely fault groups and responsible diagnostic thinking. They do not replace competent inspection, safe isolation or site-specific testing.
Industrial Fault Finding
Control fuse keeps blowing on industrial machinery
A replacement control fuse that fails again is protecting a circuit with excessive current or a fault. Increasing its rating can transfer the damage elsewhere.Read technical guide →PLC & Controls
Motor runs manually but not in automatic mode
Successful manual operation often proves part of the motor and power circuit. Automatic operation still depends on permissives, sensors, sequence logic and mode selection.Read technical guide →Industrial Fault Finding
Machine faults after running for a while — heat, load and vibration clues
A fault that appears only after a period of running often follows temperature, sustained load, vibration or a repeating production condition.Read technical guide →Control Panels
24VDC power supply voltage dropping under load
A 24V supply that appears normal unloaded can collapse when devices operate. The cause may be excessive load, a downstream fault, resistance in the circuit or the supply itself.Read technical guide →Motors & Drives
Why does a VFD trip on overcurrent during startup?
A startup overcurrent trip can be caused by drive settings, motor or cable condition, the connected load or an unsuitable acceleration demand.Read technical guide →PLC & Controls
PLC output is ON but the device is not operating — what does that mean?
An ON indication shows that the PLC program has commanded an output. It does not prove that electrical power reaches the field device or that the device can operate.Read technical guide →Sensors & Instrumentation
Proximity sensor not detecting — sensor, wiring or PLC fault?
A missing sensor signal can start at the target and mounting, inside the sensor, along its cable, at the PLC input or in the machine sequence.Read technical guide →Machine or system fault?