Siemens SINUMERIK 880 Instalação, operação e manutenção - Página 16
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Maintenance
Temperature
Electrical
apparatus
conditions becomes quite warm.
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:
Temp. by
All HP
Resistance
1500HP
or less
Over
Temp. by
1500HP
Embedded
-Under
Detector
7000V
Over
1500HP
-Over
7000 V
When operating at 1.15 service factor load:
Temp. by
All HP
Resistance
1500HP
or less
Over
Temp. by
1500HP
Embedded
-Under
Detector
7000V
Over
1500HP
-Over
7000 V
These
temperatures
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.
operating
under
normal
Although some
Class of Insulation System
B
F
120°C
145°C
165°C
(248°F)
(293°F)
(329°F)
130°C
155°C
180°C
(266°F)
(311°F)
(356°F)
125°C
150°C
175°C
(257°F)
(302°F)
(347°F)
120°C
145°C
165°C
(248°F)
(293°F)
(329°F)
Class of Insulation System
B
F
130°C
155°C
175°C
(266°F)
(311°F)
(347°F)
140°C
165°C
190°C
(284°F)
(329°F)
(373°F)
135°C
160°C
185°C
(275°F)
(320°F)
(365°F)
130°C
155°C
175°C
(266°F)
(311°F)
(347°F)
represent
the
maximum
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
H
vibration change over a period of time.
Corrective Maintenance
Two factors that require corrective maintenance are
electrical failure or mechanical failure. The first sign
of
electrical
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.).
H
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.
Flying dirt, dust or other particles.
May cause eye injury.
Wear safety glasses and dust mask when using
compressed air.
Cleaning
Clean the outside of the motor regularly.
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.
- 15 -
failure
is
usually
low
CAUTION
insulation
Actual