Chapter 3 Operation Order and Installation
Input
signal
doesn’t
turn off
Sneak current due to the use of two
different power supplies.
E1 > E2, sneaked.
Use only one power supply.
Connect a sneak current prevention diode.
3.7.5 Output Circuit and Corrective Actions
The following describes possible troubles with output circuits, as well as their corrective actions.
When the outp
ut is off, exces
sive voltage is
applied to the l
oad.
Load is half-wave rectified inside (in some
cases, it is true of a solenoid)
When the polarity of the power supply is as
shown in ①, C is charged. When the polarity is
as shown in ②, the voltage charged in C plus
the line voltage are applied across D. Max.
voltage is approx. 2√2.
*) If a resistor is used in this way, it does not
pose a problem to the output element. But it may
make the performance of the diode (D), which is
built in the load, drop to cause problems.
Connect registers of tens to hundreds KΩ across
the load in parallel.
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