By Dovydas Kersys · Chapter 21 of 58 in Machine Commissioning.

Before you begin: Follow the machine documentation, risk assessment, site procedures and lockout/tagout requirements. Commissioning can expose personnel to electrical energy, stored pressure and unexpected motion. Never defeat a safety function merely to make a test easier. Examples and diagrams are generic and must be checked against the actual machine.

Motor commissioning begins before energization. Verify nameplate data, wiring, insulation condition where required, overload/protection settings, coupling, lubrication, guarding and mechanical freedom.

Why this matters during commissioning

A drive can be configured perfectly and still fail if the motor is wired for the wrong voltage or mechanically bound.

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Commissioning procedure

  1. Record motor nameplate voltage, current, frequency, speed and power.
  2. Confirm star/delta or other connection matches supply/drive arrangement.
  3. Check motor cable termination, PE, shield/grounding method and brake wiring if present.
  4. Verify overload or drive motor data.
  5. Check shaft/coupling condition and that the load is safe for an initial jog.

Common failure patterns

  • Wrong motor connection for available voltage.
  • Brake remains applied.
  • Motor fan direction/airflow incorrect.
  • Mechanical coupling misaligned or transport lock still installed.

Evidence to record

  • Motor nameplate data
  • Connection configuration
  • Protection settings
  • Mechanical inspection result
  • Initial jog authorization

FIELD RULE: Never auto-tune or run a motor until its nameplate and mechanical condition have been verified.

Continue the series

Adapted from Machine Commissioning for Maintenance and Automation Technicians, by Dovydas Kersys. © 2026 Dovydas Kersys. Featured cover image is an AI-generated editorial illustration.

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