testing and commissioning procedure for motors _ eep
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Testing and Commissioning Procedure For
Motors
Testing and Commissioning Procedure For Motors // Photo by TECO Middle East (TME)
Scope Of Motor Testing
It should be noted that the scope of motor testing depends upon the motor type and size, this being
indicated on the inspection forms.
Motor vibration shall be measured in a tri-axial direction, i.e.:
Point x axis side of bearing housing at shaft height
Point y axis top of bearing housing
Point z axis axial of bearing housing at shaft height
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The measurements shall be carried out with an instrument conforming to ISO 2954 (10-1000
Hz frequency range). With the motor at normal operating temperature, the vibration velocity shall not
exceed 2.8 mm/s RMS, or 4 mm/s PEAK, in any direction.
For bearings fitted with proximity probes, the unfiltered peak-to-peak value of vibration (including shaft
run-out) at any load between no load and full load, shall not exceed the following values:
50 m for two-pole motors60 m for four-pole motors
75 m for six-pole or higher motors
Motor bearing (photo by CCLW INTERNATIONAL)
Bearing temperature rise limits following a heat run of 3.5 4 hours are as follows:
Rolling bearings:
Outer ring measurement max. 90 C
Temperature rise from ambient max. 50 C
Sleeve bearings:
Oil temperature max. 90 C
Bearing temperature rise by RTD max. 50 CLub. oil temperature rise from ambient max. 30 C (for forced lub. oil systems).
When commissioning or re-commissioning motors, precautions shall be taken to avoid excessive
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vibrationcaused by the phenomenon known as soft foot; i.e. feet which do not have solid flat contact
with the base prior to the tightening of the holding-down bolts.
This may be measured and rectified during installation or detected during running by the loosening of
each holding-down bolt in turn while measuring motor vibration.
Motor Soft Foot Condition
Soft feet are those which do not have solid flat contact with the base prior to the tightening of the
holding-down bolts; one or more feet may be soft as shown in Figures 1 to 3.
The profile of the foot contact area may be as shown in Figures 4 to 6.
The profile of the foot contact area (Figures 1, 2 and 3)
Figure 1- Machine resting on 3 feet, foot 4 is raised or soft
Figure 2 - Machine resting on diagonal formed by feet 3 and 4, feet 1 and 4 are soft
Figure 3 - Bottoms of all 4 feet are not parallel with base, feet 3 and 4 are soft
Profile of 'soft foot' contact area
NOTE:Re-machining of rotor feet is required in Figures 4 and 5; temporary use of wedge-shaped
shims may be acceptable (maintenance).
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Forms
Form 14 Inspection of electric motor Cage-induction type(incl. control unit)
Inspection of electric motor cage-induction type (including control unit)
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Form 4 Inspection of Switching Units HV Switchgear
Inspection of Switching Units - HV Switchgear
Form 11 Inspection Of Outgoing Unit LV Switchboard
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Inspection Of Outgoing Unit - LV Switchboard
Reference:Field Commissioning and Maintenance Of Electrical Installations and Equipment Manual
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