Siemens RGZESDI Entanglement May cause injury or property damage, Bearing Lubrication, Cleaning

BEARING LUBRICATION

Bearing life is assured by maintain- ing proper alignment, proper belt or chain tension, and good lubrication at all times.

Prior to shipment, motor bearings are lubricated with the proper amount and grade to provide six months of satisfactory service under normal operating conditions.

CAUTION

Entanglement.

May cause injury or property damage.

To avoid the danger, do not lubricate motor while in operation, since excess grease will be forced through the bearings and into the motor before it will force its way out of the drain plug. Excess grease accumulation on windings reduces the insulation life.

For best results, grease should be compounded from a polyurea base and a good grade of petroleum oil. It should be of No. 2 consistency and stabilized against oxidation. Operating temperature range should be from -15°F to +300°F for class F and H. Most leading oil companies have special bearing grease that is satisfactory.

Re-lubricate bearings every six months (more often if conditions require) as follows:

1.Stop the motor. Lock out the switch.

2.Thoroughly clean off pipe plugs and remove from housings.

3.Remove hardened grease from drains with stiff wire or rod.

4.Add grease to inlet until small amount of new grease is forced out of the drain.

5.Remove excess grease from ports, replace inlet plugs, and run motor 1/2 hour before replacing drain plugs.

6.Put motor back in operation.

INSULATION RESISTANCE

Check insulation resistance periodi- cally. Any approved method of mea- suring insulation resistance may be used, provided the voltage across the insulation is at a safe value for the type and condition of the insula- tion. A hand-cranked megger of not

over 500 volts is the most conve- nient and safest method. Standards of the Institute of Electrical and Electronics Engineers, Inc. (IEEE) recommend that the insulation resistance of stator windings at 75°C, measure at 500 volts DC, after one Minute should not be less than:

Rated Voltage of		Insulation
Machine + 1000	=	resistance in
1000		Megohms

This formula is satisfactory for most checks. For more information, see IEEE Standard No.43, “Recommended Practice for Insulation Resistance Testing of AC Rotating Machinery”

CLEANING

The motor exterior must be keep free of oil, dust, dirt, water, and chemicals. For fan cooled motors, it is particularly important to keep the air intake openings free of foreign material. Do not block air outlet or inlet.

On non-explosion proof TEFC motors, a removable plug in the bottom of the motor bearing hous- ing permits removal of accumulated moisture. Drain regularly.

SERVICE

For immediate action on your motor problems, call your certified service center or contact your nearest Siemens District Office.

WARNING

Entanglement.

Can cause death, serious injury, or property damage.

To avoid the danger, do not attempt to clean motor while it is operating. Contact with rotating parts can cause severe personal injury or property damage. Stop the motor and lock out switch before cleaning.

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