Mitsubishi Electric FR-A700 EC, Instruction Manual

Page: 770 / 826

Measurements on the main circuit Maintenance and inspection
8 - 18
Use an FFT to measure the output voltage accurately. A tester or general measuring
instrument cannot measure accurately.
When the carrier frequency exceeds 5 kHz, do not use this instrument since using it may
increase eddy-current losses produced in metal parts inside the instrument, leading to
burnout. If the wiring length between the inverter and motor is long, the instrument and CT
may generate heat due to line-to-line leakage current.
When the setting of Pr. 195 "ABC1 terminal function selection" is positive logic.
Item Measuring Point
Measuring
Instrument
Remarks (Reference Measurement Value)
Frequency
setting signal Across 2, 4 (positive)
and 5 Moving-coil type
(Tester and such
may be used)
(Internal resist-
ance: 50k
Ω
or
larger)
0–10 V DC, 4–20 mA "5" is
common
Across 1 (positive)
and 5 0–
±
5 V DC, 0–
±
10 V DC
Frequency set-
ting power
supply Across 10 (positive)
and 5 5.2 V DC
Across 10E (positive)
and 5 10 V DC
Frequency
meter signal Across CA (positive)
and 5 About 20mA at maximum frequency
Across AM (positive)
and 5 Approximately 10V DC at maximum
frequency (without frequency meter)
Start signal
Select signal Across STF,
STR, RH, RM, RL,
JOG, RT, AU, STOP,
CS and SD (0V) When open: 20 to 30 V DC
ON voltage: 1 V or less "SD" is
common
(source
logic)
Reset Across RES-SD
(0V)
Output stop Across MRS-SD
(0V)
Alarm signal Across A1-C1 and
B1-C1 Moving-coil type
(such as tester)
Continuity check
Normal Abnormal
Across A1-C1 Discontinuity Continuity
Across B1-C1 Continuity Discontinuity
Tab. 8-7: Measuring Points and Instruments (2)