This checklist is required to ensure that all operational and safety precautions are in effect before operating a High Tension Motor (HT Motor) without load. Follow each step accurately to ensure peak performance &Â safety compliance.
Equipment Specifications
- Name of the Equipment – Identifies the specific motor in operation.
- Code – Unique identification number for the motor.
- Kilowatt (kW) – The motor’s power rating.
- Voltage (V) –Â Nominal operational voltage.
- Current (I) – The operating current under no-load conditions.
- Speed – The motor’s rotational speed (RPM).
- Frequency (Hz) – The supply frequency is commonly 50 or 60 Hz.
- Duty – The motor’s operating duty cycle.
- Connection Type-Â Star/Delta (or)Â other types of wire.
- Degree of Protection – The motor’s enclosure rating (such as an IP rating).
- Insulation Class – The classification of the motor insulation.
- Frame – Motor frame type & size.
- Serial Number – The motor’s unique serial number.
- Make –Â Motor’s manufacturer.
Checking List
Before starting the motor, the following checklist verifies that both operational and safety standards are followed.
- Proper Approach and Housekeeping:Â Keep the area surrounding the motor clean and clear of impediments.
- Pending Permit to Work (PTW):Â Confirm that no pending PTW is active on the equipment.
- Personnel Safety:Â Make sure no one is working on (or)Â near the equipment.
- Motor Status:Â Verify that the motor is not currently operating.
- Coupling Status: Determine whether the motor is linked or disengaged.
- Power & Control Supply:Â Ensure that the primary power and control supplies are operational.
- Motor Mounting:Â Check the motor’s mounting, foot/flange type, & ensure the foundation bolts are tight & undamaged.
- Terminal Box Condition:Â Check that the terminal box & insulated terminal block are intact &Â not damaged.
- Earthing:Â Make that the motor and Local Control Stations (LCS) are correctly earthed.
- Winding Resistance: Determine the resistance of each phase winding.
- Insulation Resistance (IR): Using a 5000V insulation tester, measure the phase-to-earth insulation resistance. Ensure readings exceed 8.0 MΩ. If the IR reading is low, start the space heater.
- Space Heater Status:Â Determine if the space heater is operating.
- Logic and Protection Systems:Â Ensure that all motor protection & logic systems are functional.
- PTW Removal: Remove any PTW & “DO NOT OPERATE” signs from the motor feeder.
- Selector Switch Position:Â Determine the LOCAL/OFF/REMOTE selector switch based on operating needs.
- Earth Switch:Â Isolate the earth switch with the handle and hold it in the ‘O’ position.
- Breaker/Feeder Status: Rack the breaker (or)Â feeder.
- Control Power MCB: Switch on the control power MCB.
- Feeder indication:Â Check that the feeder’s “OFF” indication is flashing.
- Clearance for Operation:Â Request permission from DCS/LCS to turn on the feeder & validate the DOR (Dead-On-Run).
- Current Measurement: Current measurement entails measuring the current throughout multiple phases and recording the results.
- Motor Vibration and Noise Check:Â Listen for any strange noises or vibrations.
- Motor Temperature:Â Measure &Â record the motor’s heating & temperature performance on the test sheet.
No Load/Load Run Test
Perform a no-load or load run test, & record the following parameters:
Stating Current:
Starting Time:
| S.No | Time | Voltage (V) | Current (A) | Remarks | ||||
| R-Y(V) | Y-B(V) | R-B(V) | R(A) | Y(A) | B(A) | |||
| 1 | ||||||||
| 2 | ||||||||
Temperature Measurement
Monitoring the temperatures at necessary spots on the motor to ensure it functions safely.
| S. No | Time | Motor Body | Bearing Temperature | Winding Temperature | Remarks | |
| DE | NDE | |||||
| 1 | ||||||
Vibration Measurement
Vibration is an important aspect in motor operation. Measure & record the vibration at several points.
| S. No | Time | Permissible Value (mm/sec) | Vibration Value Measured (mm/sec) | Remarks | ||
| V | H | A | ||||
| 1 | ||||||
Safety Note
Checklist
Summary
This detailed checklist ensures that all necessary precautions, checks, & safety standards are followed before using an HT Motor. It includes everything from pre-start tests to performance monitoring during operation, thereby preventing faults and ensuring optimal functionality.
 Motors run smoothly. Learn the essential processes for maintenance, safety, and performance optimization, such as insulation checks, cooling system inspections, and vibration testing.){kind=link}