Hitachi J300 Series Instruction Manual page 87

10.3 Measurement Method for VO Voltage, Current, and Power
ured is the total effective value.
General measuring instruments for I/O voltage, current, and power are indicated below.
voltage to be measured is the fundamental wave effective voltage and the Dower to be n
R
( 1 1
supply (L2)
General
s purpose v
Table 3 Parts to be measured
iiem
Measunng instmment
Rcmarks
Supply voltag€
E l
Between R and S, S and
T,TandR(ERXESXET)
Moving-iron typc
volme!er or rectifier
{
-f-
Srpply current
I 1
R, s,T oRXIsXtr)
*
Moving-iron rype
Total eff€crive
Supply power Bctween R and S, S and
T ( W | l X W l 2 )
-
Electrodlnamr! rlDe
Total eflbctive
Supply power
Pfr
Calculate lhe supply power factor from lhe measurcd suppty vottage, Er,
supply cunent I I and supply power w I .
pr,= -w,
. toot%,
, / I , E L . I l
Outpul voltage
Eo
Between U and V, V and
(EUXEvXEw)
,
Rectifier typc
Total effcctive
value
Io
U, V, w (hr)(Iv)(Iw)
d
Movios-iron type
Total effcctive
Oulput power Between U and V, V
(WorXwo2)
Electronic tvDc
Total effectivc
Outpui power
Pfo
Cal( ulale the oulpur puser la.Inr Ir.m lhe output v^lrage L. L'urpul curfcnt I
nnu outpur power w,
Pf^= :wo x toot%t
"
J3 .Eo.Io
NOTEI: Use a meter indicating a fundamental wave effective value fbr voltage, and
meters indicating total effective values for current and power.
NOTE 2: The inverter output waveform is a distorted wave, and low frequencys nuy cause
errors. However, the measuring instruments and methods indicated above pro-
vide compiuatively accuratc values.
NOTE 3: A tester (general purpose) may not be suited often to measurement of a distorted
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