ALL-TEST PRO AT31, Руководство пользователя

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ALL-TEST
PRO ®
31 User Manual
©2011, ALL-TEST
Pro,
LLC
www.alltestpro.com
rev 2011-11F
29
3.
When charging the charging indicating light will be illuminated red.
4. The display screen will provide the instruments condition during the charge. The data on the
screen will identify information on the battery charge including length of time on charge,
battery voltage level and battery temperature.
5. The battery charge indicating light will turn green when fully charged. If the unit is not being
used, it is recommended that the unit be left on a trickle charge.
VII. Data Interpretation Three Phase Motors
The basic tolerances for the ALL-TEST
PRO®
31 are the same as the ALL-TEST IV
PRO™
,
Data Interpretation Tables
During testing with the ALL-TEST
PRO®
31 if a fault is detected using the interpretation tables, review
all of the additional data interpretation consideration before issuing a pass/fail on the winding tested.
When making repair/replace decisions it is also important to evaluate the specifics of the application,
such as: Is the motor in a critical application, what are the operating conditions, environment, etc.?
Table 1: Three Phase Motor Test Results
Test Limits Description
Impedance Special This result can be used to trend the condition of a winding. If the
overall readings decrease significantly, between tests, then the
winding is degrading or contaminated.
Phase Angle (Fi) +/- 1 point Fi is a winding short indicator. A result of 35, 36, 37 degrees is
OK, a result of 35, 32, 32 would be a fault (shorted winding). This
value should be greater than 15 degrees.
Current/Frequency
(I/F) +/- 2 points I/F is a winding short indicator. A result of -44, -45, -46 would be
OK, -44, -46, -46 is borderline and -42 -45, -45 would be a fault
(shorted winding). These readings should be between -15 and -50.
Phase Balance +/- 5% Indicates winding unbalance which will result in current unbalance,
motor heating and poor starting. It is recommended that this value
remains under 3% with 5% indicating a fault.
Insulation
Resistance See Table 2 and
3
Indicates ground wall insulation failure or severe winding
contamination.
Table 2: Insulation Resistance Voltage
Motor Voltage Rating Insulation Test Voltage
< 1000 Volts AC 500 V
1000 to 2500 Volts AC 1000 V
2501 to 5000 Volts AC 1000 - 2500 V