40
Magtrol Model 6530 Three-Phase Power Analyzer
Chapter 4 – Operating Principles
THEOR
Y
Magtrol 7500 Series Power Analyzer
4.3.2
p
eak
h
oLD
/ i
nrush
c
urrent
Peak hold/inrush current allows the 7500 to store the highest value read in a designated period of
time, the designated period of time being the time span since the last peak hold clear occurred.
Values include amps, watts and volts in any preferred combination. See
Section 3.3.7.3 – Peak Hold
.
The graph below shows the current draw from a 1/3 horsepower motor during initial startup. At
startup the current inrush peaks at about 14 amps then settles to 4.25 amps. When the unit is in peak
hold/ inrush mode of operation, the front panel current reading displays 14.033 amps. The current
reading indicates the peak inrush current, which is determined by the RMS value.
The operation of the volts and watts peak hold follows the same operation as explained for the
current above.
Figure 4–2 Peak Hold/Inrush Current Example
4.3.3
Dc
See
Section 4.2.2 – DC Details
.
