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Precautions for maintenance and inspection
3
PROTECTIVE FUNCTIONS
Start signal
Select signal
Across STF,
STR, RH, RM,
AU-SD
Moving-coil type
(Tester and such may
be used)
(Internal resistance:
50k
Ω or larger)
When open
20 to 30VDC
ON voltage: 1V or less
"SD" is common
Alarm signal
Across A-C
Across B-C
Moving-coil type
(such as tester)
Continuity check
<Normal> <Abnormal>
Across
A-C: Discontinuity Continuity
Across
B-C: Continuity Discontinuity
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.
Item
Measuring
Point
Measuring
Instrument
Remarks
(Reference Measurement Value)