Omron F3S-B Series, Instruction Manual

Page: 36 / 37

F3S-B
36
TROUBLESHOOTING Section 8
The F3S-B runs internal self-tests after the power is turned ON and while the F3S-B is in normal opera-
tion. The external test is also available. If a failure is detected, a corresponding flicker pattern is indicated
by the red LED (OFF-state indicator) of the receiver. Each failure indication sequence, other than continu-
ous flashing, will repeat after a two-second interval. This repetition will continue until a remedy is effected.
Indication Cause Remedy
Flashing
continuously Relay monitoring failure during
ON-state
(In the case that the Relay moni-
toring function is activated, the
wrong status of the relay NC con-
tact is detected when the control
outputs are in the ON-state.)
−
Check connection of the relay monitoring input.
−
Check the voltage of the relay monitoring input.
(When control outputs are ON-state, the relay moni-
toring input must show 0 V )
* Regarding only this failure, the interruption and
restoration of power is necessary to restore F3S-B.
Flashing
once Internal parameter failure of a
receiver −
Change the setting parameters by the optional soft-
ware F39-U1E, or reset the setting parameters to
factory setting status also by F39-U1E.
−
Replace the receiver.
Flashing
twice
Communication failure between
an emitter and receiver,
or internal failure of an emitter −
Check connection of the emitter and the receiver.
−
Check series connection of the emitters.
−
Check if the emitter and the receiver have the same
type name.
−
Check if the type name of the slave unit emitter is
same as the indicated one on the label of the mas-
ter unit emitter
−
Replace the emitter.
Flashing
three times Internal memory failure of a
receiver
−
Replace the receiver.
Flashing
four times Relay monitoring failure during
OFF-state
(In case that Relay monitoring
function is activated, wrong status
of the relay NC contact is detected
when the control outputs are OFF-
state.)
−
Check connection of relay monitoring input.
−
Check the voltage of the relay monitoring input.
(When control outputs are OFF, the relay monitoring
input must be at a level of 17 VDC to Vs.)
Flashing
five times Control output failure
(High level voltage is detected
although a control output is in
OFF-state.)
−
Check connection of control outputs for a short cir-
cuit with Vs (cables, connected devices)
−
Replace the receiver.
Flashing
six times Internal hardware failure of a
receiver −
Replace the receiver.
Flashing
seven times Series connection system fail-
ure of receivers −
Check series connection between the receivers.
−
Check if the type name of the slave unit receiver is
same as the indicated one on the label of the mas-
ter unit receiver
−
Replace the master unit receiver and /or the slave
unit receiver.
0.5 sec 0.5 sec
2 sec
N times flashing
Fig. Timing Chart for flashing pattern of red LED (OFF-state indicator)