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Item Measuring Point
Measuring
Instrument
Remarks
(Reference Measured Value)
Frequency setting
power supply
Across 10 (+)-5 5VDC
"5" is
common.
Across FM (+)-SD
Approximately 5VDC at
maximum frequency
(without frequency meter)
8VDC
T1
T2
Pulse width T1:
Adjusted with C1
Pulse cycle T2:
Set with Pr. 55 (Pr,56)
SD is common.
Frequency meter
signal
Across AM (+)-5
Moving-coil type
(Meter, etc. may be
used)
(Internal resistance:
50k
Ω
or larger)
Approximately 5VDC at
maximum frequency
(without frequency meter)
5 is
common.
Start signal
Select signal
Across STF, STR,
RH, RM, RL, MRS,
RES-SD
Moving-coil type
(Meter, etc. may be
used)
(Internal resistance:
50k
Ω
or larger)
20 to 30VDC when open.
ON voltage: 1V or less
SD is common.
SD is
common.
Continuity check
<Normal> <Fault>
Across
A-C:
Discontinuity Continuity
Alarm signal
Across A-C
Across B-C
Moving-coil type
(such as a meter)
Across
B-C:
Continuity Discontinuity
CAUTION
1. Use FFT to measure the output voltage accurately. It can not be measured
accurately with a meter or general instrumentation.
2. When the carrier frequency exceeds 5kHz, do not use the instrument because
overcurrent losses occurring in the metallic parts inside the instrument will
increase and may lead to burnout.
In this case, use an approximate effective value type instrument.