BECKWITH ELECTRIC M-3425A, Instruction Book

Page: 271 / 482

M‑3425A Instruction Book
5–16
22. Press
ENTER
to display:
POS SEQUENCE CURRENT
Amps
The positive sequence current should be
I
POS
y
I
a
y
I
b
y
I
c
.
23. Press ENTER
to display:
NEQ SEQUENCE CURRENT
Amps
Negative sequence current should near
zero amperes.
24. Press
ENTER
to display:
ZERO SEQUENCE CURRENT
Amps
The zero sequence current should be
I
ZERO
y
0 A. If a significant amount of
negative or zero sequence current
(greater than 25% of I
A
, I
B
, I
C
,) then either
the phase sequence or the polarities are
incorrect. Modify connections to obtain
proper phase sequence and polarities.
25. Press
ENTER
to display:
F49 THERMAL CURRENT #1
Amps
Press
ENTER
once more to display:
F49 THERMAL CURRENT #2
Amps
26. Press
EXIT,
then the Right arrow to
display:
FREQUENCY STATUS
volt curr FREQ v/hz
V
27. Press
ENTER
to display:
FREQUENCY
Hz
28. Press
ENTER
to display:
RATE OF CHANGE FREQUENCY
Hz/Sec
29. Press EXIT
, then right arrow to display:
V/HZ STATUS
volt curr freq V/HZ
V
30. Press
ENTER
to display:
VOLTS PER HERTZ
%
31. Press EXIT
, then right arrow to display:
POWER STATUS
W
POWR imped sync brkr
V
32. Press
ENTER
to display real power and
check its sign. The unit should display:
REAL POWER
PU W
The sign should be positive for forward
power and negative for reverse power.
If the sign does not agree with actual
conditions, check the polarities of the
three neutral‑end CTs and/or the PTs.
33. Press ENTER
for the unit to display:
REACTIVE POWER
PU VAr
34. Press
ENTER
for the unit to display:
APPARENT POWER
PU VA
35. Press ENTER
to display:
POWER FACTOR
Lag/Lead