Control Panels
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.
Motors & Drives
Three-phase motor humming but not turning — common causes
A humming motor is receiving some electrical energy, but that does not mean it has a healthy three-phase supply or can accelerate its load safely.Read technical guide →Motors & Drives
Contactor pulls in but the motor will not run — what should be checked?
A contactor operating proves only part of the control sequence. The motor circuit, overload, supply, connections and mechanical load still need to be assessed methodically.Read technical guide →PLC & Controls
PLC input is ON but the machine output is not working
An illuminated PLC input confirms one signal has reached the controller. It does not prove the sequence permits the output or that the output circuit and field device are healthy.Read technical guide →Motors & Drives
Common causes of VFD and inverter trips
A VFD trip is a protective response, not a diagnosis. The fault code, operating point, motor, load and supply conditions all help identify why the drive stopped.Read technical guide →Control Panels
24VDC control circuit faults — common causes
A missing or unstable 24VDC control supply can affect many apparently unrelated devices. The circuit should be divided into supply, distribution and load sections before parts are replaced.Read technical guide →Industrial Fault Finding
Why does an industrial machine keep stopping intermittently?
Intermittent machine stops need accurate evidence more than quick part changes. Timing, sequence state, alarms and shared electrical conditions often reveal the pattern.Read technical guide →Motors & Drives
Motor overload keeps tripping — possible causes
A motor overload trip indicates sustained current or a protection/control issue that needs explaining. Raising the setting without evidence can remove protection from the motor.Read technical guide →Machine or system fault?