Motor auxiliaries are often fed from different panels and commissioned by different teams. A missing blower permissive or a brake supplied at the wrong voltage may not appear in the main-feeder test, yet it can stop the machine from operating correctly.
Build one schedule from all drawings
| Auxiliary | Supply check | Functional check | Required failure response |
|---|---|---|---|
| Space heater | Voltage, protection, isolation | Heat/current indication | Alarm or maintenance action; interlock as designed |
| Independent blower | Phase, frequency, overload | Rotation and airflow | Main motor inhibited or tripped where required |
| Bearing oil pump | Motor feeder and standby source | Pressure/flow and rotation | Start permissive and low-pressure response |
| Electromagnetic brake | Coil voltage and rectifier | Release and application | Safe state on power loss |
| RTD/PTC circuit | Instrument supply and wiring | Plausibility and simulated alarm/trip | Defined alarm, trip and sensor-fault logic |
| Encoder/control module | Supply level and shielding | Direction and signal quality | Drive response to lost feedback |
Reconcile the motor data sheet, terminal diagram, panel schematic and cause-and-effect. A terminal marked “heater” does not establish its supply voltage or control philosophy.
Test normal and failed states
Verify the sequence before coupling to the process. For a blower-cooled motor, prove that the blower runs in the correct direction, establishes the required status and prevents operation when unavailable. For a brake motor, separate controlled stopping from mechanical holding and confirm the expected state after control-power loss.
Record final protection settings, terminal numbers and panel references. Temporary commissioning jumpers must be removed and documented.
Handover a usable record
The closeout package should contain the final auxiliary schedule, point-to-point checks, functional-test results, cause-and-effect revision and parameter backup. Operators should know which alarm identifies each lost auxiliary.