Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive - Air-Cooled (A Frame) - Manual (Page 287)

Component Definition and Maintenance 5-45
7000 “A” Frame 7000A-RM001A-EN-P – January 2011
Let us calculate the capacitance using the first reading. In this case:
V = 200V, I = 1.87 for L1-N
Xc = V/I = 200/1.87 = 106.95
F C
C
Xc f
C
μ
π
7 . 29
95 . 106 50 14 . 3 2
1
2
1
=
Ч Ч Ч
=
=
Where, f = frequency of the applied voltage.
Similarly, you can calculate the capacitance for the remaining two
measurements for L2-N and L3-N.
Recommended Digital Multimeters (DMM)
to be used for checking filter capacitors
BK Precision LCR/ESR Meter, Model 885
Fluke 179 Fluke 12 Fluke 29 Fluke 87V
Figure 5.35 – Recommended Digital Multimeters (DMM)