BECKWITH ELECTRIC M-3425A, Инструкция

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Installation – 5
5–15
11. Press
ENTER
until the unit displays:
ZERO SEQUENCE VOLTAGE
Volts
The zero sequence voltage should be
V
ZERO
y
0.
If the negative sequence voltage shows
a high value and the positive sequence
voltage is close to zero, the phase
sequence is incorrect and proper phases
must be reversed to obtain correct phase
sequence. If the phase sequence is
incorrect, frequency‑ and power‑related
functions will not operate properly and
the
Frequency Status
menu will read
DISABLE
.
If positive, negative and zero sequence
voltages are all present, check the polarities
of the VT connections and change
connections to obtain proper polarities.
12. Press
ENTER
until the unit displays:
3RD HARMONIC NTRL VOLT
Volts
13. Press
ENTER
until the unit displays:
FIELD GND MEAS. CIRCUIT
mV
14. Press EXIT
until the unit displays:
VOLTAGE STATUS
VOLT curr freq v/hz

15. Press the right arrow to display:
CURRENT STATUS
volt CURR freq v/hz

16. Press
ENTER
to display line currents (I
A
,
I
B
, I
C
). The unit should display:
PHASE CURRENT
A= B= C=
Compare these currents with the
measured values using a meter. If
there is a discrepancy, check the CT
connections to the rear terminal block
of the unit.
17. Press ENTER
for the unit to display:
PHASE CURRENT
a= b= c=
Compare these currents with the
measured values using a meter. If
there is a discrepancy, check the CT
connections to the rear terminal block
of the unit.
18. Press ENTER
for the unit to display:
DIFFERENTIAL CURRENT
A= B= C=
Differential current should be near
zero amps. If a significant amount of
differential current is present, check the
CT polarities.
19. Press
ENTER
for the unit to display:
NEUTRAL CURRENT
Amps
20. Press
ENTER
for the unit to display:
GND DIFFERENTIAL CURRENT
Amps
21. Press
ENTER
for the unit to display:
STATOR LOW FREQ INJECT.
I= mAmps