Fastus D4RF Series, User Manual

Page: 120 / 138

5-6
Errors and Countermeasures
Error Cause Countermeasure
Detection Detection is not made (the output
indicator [orange] turns off) even
though an object is present.
The hysteresis value is too small
to maintain on output.
The hysteresis value is too small
to maintain on output. (page
4-15)
When the timer function is not in
use, output turns off while an
object is present.
The change in the light reflected
from the object is larger than the
hysteresis value. (With a diffuse
reflective fiber unit.)
Increase the “Hysteresis” value.
(page 4-15)
There is a large gap in the
received light amounts to turn the
output on and off.
The set “Hysteresis” value is too
large.
Decrease the “Hysteresis” value.
(page 4-15)
Output Output cannot be sent to a PLC
or relay.
The output wiring is not correct. Refer to the I/O circuit diagrams
in this manual and connect the
output wire correctly.
The output pulse width is too
short to be recognized by the
device to be input. (For example,
the “Response time” setting is too
short.)
• Set “Response time” to a longer
mode. (page 3-37)
• Use the “Off delay” or “Pulse
output” of the “Timer” setting
and set the pulse width of the
output signal to be recognized
by the input device. (page 4-7)
Noise, such as short-time
changes of received light amount
is output.
The product reacts too sensitively
to changes in the amount of light
received in a very short period of
time.
• Set “Response time” to a longer
mode. This prevents the product
from responding to changes in
received light amount in a short
time. (page 3-37)
• Use the “On delay” “Timer”
setting so that output is only
generated when detection is
made for the set time or longer.
(page 4-7)
Received
light
amount
The received light amount
fluctuates.
• The received light amount is
greatly affected by
environmental changes and
vibrations.
• The ambient temperature
changes greatly.
• The received light amount is
affected by the surface
conditions of the object (such as
unevenness). (With a diffuse
reflective fiber unit.)
• Adjust the installation
environment.
• Set Response time to a longer
mode. (page 3-37)
• Set “APC” to “On”. (page 4-17)