Mitsubishi Electric FR-S500 Instruction Manual page 66

Measuring
Item
Across STF,
Start signal
STR, RH, RM,
Select signal
RL-SD
Across A-C
Alarm signal
Across B-C
CAUTION
1. Use an FFT to measure the output voltage accurately. An FA tester or general
measuring instrument cannot measure accurately.
2. When the carrier frequency exceeds 5kHz, do not use this instrument since
using it may increase eddy-current losses produced in metal parts inside the
instrument, leading to burnout.
In this case, use the approximately effective value type instrument.
Measuring
Point Instrument
Moving-coil type
(Tester and such may
be used)
(Internal resistance:
Ω
50k
Moving-coil type
(such as tester)
Precautions for maintenance and inspection
(Reference Measurement Value)
When open
20 to 30VDC
ON voltage: 1V or less
or larger)
Continuity check
Across
A-C:
Across
B-C:
61
Remarks
<Normal> <Abnormal>
Discontinuity Continuity
Continuity Discontinuity
7