Siemens 580 用户手册

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Temperature 
Electrical apparatus operating under normal 
conditions becomes quite warm.  Although some 
places may feel hot to the touch, the unit may be 
within limits.  If checking total temperature by winding 
resistance or imbedded detector (RTD), the total 
temperature should not exceed the following: 
 
When operating at full load: 

 

 
When operating at 1.15 service factor load: 

 

 
These temperatures represent the maximum 
temperature for each class of insulation and include a 
40°C ambient temperature.  Operation above these 
temperatures will result in reduced insulation life. 
 
Vibration 
Most problems can be detected when inspected 
visually.  Check for; 
 
1.  Loose or missing parts, such as fan blades, nuts, 

bolts, screws, couplings, etc. 

2.  Accumulation of dirt on fan or rotor. 
3. Associated 

equipment - Disconnect equipment to 

determine where the vibration is being generated. 

 
4. Foundation construction - Base, grouting and 

associated equipment supporting drives must be 
in good condition.  Vibration can be amplified by 
weak construction.  Vibration of base just below 
motor feet should not exceed 25% of motor 
vibration. 

5. History - When was vibration first noted?  Was 

there a change in loading and/or duty of 
equipment?  Has ambient vibration changed? 
 

More important than the actual vibration is the 
vibration change over a period of time. 
 

Two factors that require corrective maintenance are 
electrical failure or mechanical failure.  The first sign 
of electrical failure is usually low insulation 
resistance.  Mechanical failures are usually preceded 
by excessive bearing noise or heat. 
 
Low Insulation Resistance 
Factors that usually cause low insulation readings 
are: 
 
1.  Dirty windings (oil, dust, grease, salt, etc.). 
2. Excessive 

moisture. 

3.  Mechanically damaged insulation. 
4. Heat 

deterioration 

 
Dirty winding can be cleaned and moist windings 
dried; however, items 3 and 4 require extensive 
repairs by a certified service center. 
 

May cause eye injury. 

Wear safety glasses and dust mask when using 
compressed air. 

 
Cleaning 
Clean the outside of the motor regularly.  Actual 
conditions existing around the motor dictate the 
frequency of cleaning operations.  Use the following 
procedures as they apply. 
1.  Wipe off dust, dirt, oil, water, etc., from external 

surfaces of the motor. 

2.  Remove dirt, dust, or other debris from ventilating 

air inlets and exhausts.  Do not operate motor 
with air passages blocked or restricted.