3.8 Verifying Correct Wiring (Wiring Check)
59
3
Chapter 3 Connecting to Lines to be Measured
3
Current
phase
FAIL will display when the
cu
rrent ph
ase sequence is
incorrect.
• Are the clamp-on sensors clamped cor-
rectly?
• Does the arrow of the clamp-on sensor
p
oint to
the load side?
See: 3.2, "Setting Measurement Conditions on the Wiring Diagram Screen" (p.
43)
See: 3.6, "Connecting Clamp Sensors to Lines to be Measured" (p. 52)
Phase
difference
FAIL will display when each
cu
rrent ph
ase is not within
90° with respect to the volt-
age of each phase.
• Are V leads and clamp sensors con-
nected?
• Is arrow of clamp sensor pointed to the
lo
ad?
CHECK appears if curr.
phase is w/in ±60 to ±90°of
each volt. phase.
• Are V leads and clamp sensors con-
nected?
• Is arrow of clamp sensor pointed to the
lo
ad?
•
In light loads, PF may be low and phase
d
i
ff. may be large. Check wiring for prob-
lems and proceed if OK.
• When phase advances too much due to
p
hase advancer in light loads, PF may be
low and phase diff. may be large. Check
wiring for problems and proceed if OK.
See: 3.3, "Connecting the Voltage Cords" (p. 47) to 3.6, "Connecting Clamp Sen-
sors to Lines to be Measured" (p. 52)
Power
factor
CHECK will display if the
power factor of the line to
be
measured is less than 0.5.
• Are the clamp-on sensors clamped cor-
rectly?
• Does the arrow of the clamp-on sensor
p
oint to
the load side?
• When the load is light, the power factor
m
ay be
low and the phase difference
may be large. Check the wiring and if no
problems are observed, you may pro-
ceed with the measurement
• When the phase advances too much due
t
o the u
se of a phase advance capacitor
during a light load, the power factor may
be low and the phase difference may be
large. Check the wiring and if no prob-
lems are observed, you may proceed
wit
h the m
easurement
See: 3.4, "Connecting a Clamp Sensors" (p. 49)
See: 3.6, "Connecting Clamp Sensors to Lines to be Measured" (p. 52)
wiring confir-
mation item
Judgment conditions Confirmation steps
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