Hioki PW3360-20, Instruction Manual

Page: 65 / 224

3.8 Verifying Correct Wiring (Wiring Check)
57
3
Chapter 3 Connect
ing to
Lines to be
M
easure
d
3
Current
phase
FAIL will display when the
current phase sequence is
incorrect.
• Are the clamp-on sensors clamped cor-
rectly?
• Does the arrow of the clamp-on sensor
point to the load side?
See: 3.2, "Setting Measurement Conditions on the Wiring Diagram Screen" (p.
41)
See: 3.6, "Connecting Clamp Sensors to Lines to be Measured" (p. 50)
Phase

difference
FAIL will display when each
current phase 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
load?
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
load?
• In light loads, PF may be low and phase
diff. may be large. Check wiring for prob-
lems and proceed if OK.
• When phase advances too much due to
phase 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. 45) to 3.6, "Connecting Clamp Sen-
sors to Lines to be Measured" (p. 50)
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
point to the load side?
• When the load is light, the power factor
may 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
to the use 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
with the measurement
See: 3.4, "Connecting a Clamp Sensors" (p. 47)
See: 3.6, "Connecting Clamp Sensors to Lines to be Measured" (p. 50)
wiring confir-
mation item
Judgment conditions Confirmation steps