Baldor Reliance Electric Motor 9240-SB-HV

Section 3 – Checking Insulation Resistance

Check the insulation resistance of the stator winding with an insulation resistance meter

Record the insulation resistance reading

Investigate and take corrective action if there is a significant change in insulation resistance

Calculate the minimum insulation resistance (RM) using the formula RM = KV + 1

Compare insulation resistance readings to the calculated RM

Dry out the windings if insulation resistance is less than calculated RM

Bake in an oven at a temperature not to exceed 90°C until insulation resistance remains constant

With the rotor locked, apply low voltage and gradually increase current through winding until winding temperature reaches 90°C

Check air filters for high velocity air speeds up to 600 FPM (3 m/s) net face velocity

Measure resistance to air flow of a clean filter

Is the resistance to air flow of a clean filter within 0.15" W.G. (37 N/m² gauge)?

Check if static air pressure drop across filters reaches 0.50" W.G. (123.3 N/m² gauge)

Is the static air pressure drop across filters at or above 0.50" W.G. (123.3 N/m² gauge)?

Check if Differential Air Pressure Switch activates at 0.5" W.G. differential

Are air filters in place and clean?

Clean or replace air filters if pressure drop reaches threshold

Section 3 – Anti-Friction Bearing (Grease Lubricated)

Check relubrication intervals and volumes on motor nameplate

Refer to motor nameplate for recommended lubricant

Select alternate lubricant if necessary

Ensure grease is clean and fresh

Verify grease compatibility before mixing

Section 3 – Anti-Friction Bearing Removal/Replacement

Ensure equipment connected to the motor shaft cannot cause shaft rotation

Disconnect all electrical power from the motor windings and accessory devices

Replace bearing when worn, oversize, or when TRG/bearing temperature monitoring indicates excessive wear

Remove the bearing using a conventional bearing puller

Protect the shaft center using a spacer block of bass or soft material

Clean and inspect all parts, removing all old grease

Ensure all shaft bearing shoulders and journals are free of nicks

Section 3 – Anti-Friction Bearing (Grease Lubricated) – Severe Conditions

Verify applicable motor conditions

Describe the operating conditions

Ensure lubrication procedure follows the 6 Monthly task guidelines

Check relubrication intervals and volumes on the main motor nameplate

Is the shaft stationary and motor warm?

Stay clear of rotating parts and electrical circuits if lubrication is done with motor running

Locate the grease inlet, clean the area, and replace the pipe plug with a grease fitting if necessary