Operating Mode At Startup - Omron ZEN Operation Manual

Operating Mode at Startup

Circuit
Diode method
Power
supply
Varistor method
Power
supply
5

Operating Mode at Startup

User In CPU
program
In Memory
Cassette
LCD model (with LCD and
operation buttons)
LED model (with LED and
no operation buttons)
Current
AC DC
No Yes The diode connected in
parallel with the load
changes energy accumu-
lated by the coil into a cur-
rent, which then flows into
the coil so that the current
will be converted into
Joule heat by the resis-
tance of the inductive
load.
This time lag, between
the moment the circuit is
opened and the moment
the load is reset, caused
by this method is longer
than that caused by the
CR method.
Yes Yes The varistor method pre-
vents the imposition of
high voltage between the
contacts by using the con-
stant voltage characteris-
tic of the varistor. There is
time lag between the
moment the circuit is
opened and the moment
the load is reset.
If the supply voltage is 24
or 48 V, insert the varistor
in parallel with the load. If
the supply voltage is 100
to 200 V, insert the varis-
tor between the contacts.
The operating mode at startup depends on the model and the pres-
ence of a user program as shown in the following table.
No
No
STOP RUN mode with
mode program in CPU
STOP RUN mode with
mode program in CPU
Characteristic
Yes
No
RUN mode with program
in Memory Cassette
RUN mode with program
in Memory Cassette
Required element
The reversed dielectric
strength value of the diode
must be at least 10 times as
large as the circuit voltage
value. The forward current of
the diode must be the same as
or larger than the load current.
The reversed dielectric
strength value of the diode
may be two to three times
larger than the supply voltage
if the surge protector is
applied to electronic circuits
with low circuit voltages.
---
No
Yes
RUN mode with
program in CPU
RUN mode with
program in CPU
5
Yes
Yes
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