©2019 ALL-TEST Pro, LLC All Rights Reserved 54 Rev 06/20/2019
Individual Coil Testing
The coil test option is located under DC menu. Each motor field will have at least 2 coils per
field. 1 coil is a north pole and 1 is a south pole. When a change has been detected in a set of
field coils, during the detection phase, it is recommended to separate the individual coils in field
winding and measure each coil individually.
The AT7P offers the ability to individually measure up to 4 identical DC motor coils for one group
at one test to identify faulty coils within a set of coils. The users actually can test as many coils
as needed by use of the trending function in MCA software to compare coils in different groups.
One DF & Capacitance of winding and one insulation Resistance measurement are available
under Coil Test option. The MCA software will provide diagnostic conclusions for DF (Dissipation
Factor) and insulation resistance. If there are over 1 group of coils, the users can connect the
coils under one group and measure the DF & C as well as insulation resistance so that different
group of coils can be compared using Trend function.
INS = Individual coil to ground
STATIC readings for DC Shunt Dual Voltage Motors
DC1 = Individual Coil 1
DC2 = Individual Coil 2
DC3 = Individual Coil 3
DC4 = Individual Coil 4
Rule of Performing Coil Tests
1. Up to 4 coils can be tested and compared for each group of coils test. The users have the
option to test 1 coil, 2 coils, 3 coils or 4 coils.
2. If there are more 4 coils, the coils should be divided into several groups. Each group has to
have the same number of coils, and the coils should be tested per the order of coils listed.
For example, if the 1
st
group has 2 coils tested and saved, the 2
nd
group should also have 2
coils tested and saved. For both groups, the 2 coils have to be tested as 1
st
coil and 2
nd
coil
in the COIL TEST menu instead of using other combinations, e.g. 1
st
coil and 3
rd
coil.
This is required for trending purpose in MCA PRO software, which essentially compare coils
in different groups instead of trending over time. For coil individual analysis, this is not
required. Please refer to MCA software manual for details.
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