Baldor Global TEFC Series, Инструкция по установке и эксплуатации

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3-8 Maintenance & Troubleshooting MN409
Brushing and S
u
ction Cleaning
Remove the dry dust and dirt by brushing with a bristle brush, followed by a vacuum suction cleaning.
DO NOT USE WIRE BRUSHES.
Blowing
WARNING: Use of an air jet may cause flying debris and generate particulate matter. Wear suitable skin,
eye and respiratory protection. Failure to observe this precaution may result in bodily injury.
Caution: To avoid damage to the windings do not use air pressures greater than 30 psi (200 kPa). Avoid
directing the air in such a way that the dirt will be blown into inner crevices.
Dry Dirt and dust can be removed from inaccessible crevices by using a jet of low pressure, oil free
compressed dry air.
Solvent Cleaning
Caution: Do not use solvents containing trichloroethane to clean interior or exterior of motor. Damage
may occur to paint and insulation systems.
Cleaning With Water And Detergent
Windings can be cleaned by hose washing or by pressure spray from a low pressure steam generator or
shop steam line.
Caution: To avoid damage to the windings do not use air pressures greater than 30 psi (200 kPa). Avoid
directing the air in such a way that the dirt will be blown into inner crevices.
Oil, grease, tar and wax can be removed by adding a Nonconductive Detergent to the wash water.
After washing, it is necessary to dry the windings in an oven. (See “Checking Insulation Resistance”)
Reconditioning (Re − impregnating) Windings
If after cleaning with solvent or water and detergent, the insulation shows signs of dryness, it may be
necessary to re − impregnate the windings. Consult your local Baldor District office.
Checking Insulation Resistance
If the motor has been in storage for an extensive period or has been subjected to adverse moisture
conditions, check the insulation resistance of the stator winding with an insulation resistance meter.
The minimum insulation resistance (RM) can be determined from the following formula:
RM = KV + 1
Where
RM = Minimum insulation resistance in mega ohms at 40
° C of the entire machine winding.
KV = Rating machine potential, in kilovolts.
For machines in good condition, insulation and resistance readings of 10 to 100 times RM are common.
If the insulation resistance is lower than that calculated from the formula, the windings should be dried
out as follows:
Bake in an oven (preferably a circulating air oven) at a temperature not over 90
° C until insulation
resistance remains constant.
This Manual:http://www.manuallib.com/baldor/mn409-large-ac-motors-handbook.html