(5)
CPU Error Indication
CPU
ERROR
LED
is
turned
ON
in
following case:
1) CPU execution error
is
caused
by
noise interference or conductive trashes fallen
2)
ROM
cassette
is
toaded or unloaded when the PC power
is
turned
ON.
3)
Watchdog timer error
is
caused if program execution time
is
more than
0.1
second.
unit.
into the
a.
In this case, turn the
PC
power
OFF
and switch
ON
again
(power reset).
If
the
PC
operation
is
recovered, check the electrical noise source or possibility of conductive trashes.
b. If the CPU
ERROR
LED
flickers after power reset, check the pragram error in the same
manner
as
former item (Section
8-2(4)).
c. If the CPU ERROR
LED
is
still
turned
ON,
check the program execution time.
In case of failure of the input
LEDs
to illuminate, check the
ON/OFF
status in the program
with programmer, and check whether input switching device works properly. Beware following
possibilities
:
(6)
input Indications
a.
If current rating of input device
is
too large, contact error may be caused.
b. When the bleed resister for external
LED
indication
is
provided in parallel to the input
device, the
PC
input may be turned
ON
incorrectly because
of
the leakage current.
c. The
PC
may not accept
the
input signal which
is
shorten than PC execution time.
(7)
Output fndication
If outputs fail to function, beware following cases might be caused:
a.
In
case
the very low current device
is
connected to the relay output or triac output
PC
models, the output device may be activated incorrectly because of the
PC
leakage current.
b. The short circuit and large current load may cause the damage of the
PC
relay contact or
damage
of
triac and transistor device in the PC, which cause output failure.
8-3
MAINTENANCE
(1)
Periodical Check
The
PC
does not contain wasting component except
a
lithium battery and output relays.
The battery life
is
approx.
5
years
(1
year warranty) and relay life
is
subjected to the frequency
of operations and current
level
(see
the section of output handling).
The battery
is
replaced in the manner stated below.
The units installation should be checked to ensure that
it
has not been contaminated by dust or
other contaminations, also that
all
terminal connections are
stilt
tight.
The unit should not be installed in
a
situation where
the
temperature
is
likely
to
rise
to above
5OoC
(122°F).
(2)
Battery Renewat
a.
The program
RAM
memory and
a
part of software functions are backed by
a
non-chargeable
lithium battery, of which discharge life
is
more than five years
(1
year warranty). When the
battery voftage runs tow,
LED
indicator
on
the base unit
is
itfuminated. However, regardless
of
its
condition,
it
is
recommended that the battery be replaced every five years.
b.
To
renew the battery, remove
a
pannel cover
of
the base unit and renew the battery within
30
seconds, while an inside capacitor supports the memories.
-23-
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