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If the gl-rhg is not in an error condition – KEYENCE GL-RHG Series User Manual

Page 130

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1

Troubleshooting

A-6

GL-RHG-M-NOA-E

App

end
ix

If the GL-RHG is not in an error condition

Error name

Cause

Countermeasure

All Indicators are
OFF.

The power is not turned ON or the power supply
voltage is insufficient.

Adjust the power supply voltage to be within the range of
specifications.
Correctly wire the power supply.

"Examples of Wiring" (page 4-7)

Cables are disconnected or not connected
correctly

Check the connection and reconnect the cables if
necessary.

"Cable Specification" (page 4-6)

The OSSD does not
turn ON.
(Center indicator
lights in red or does
not turn ON)

Are the beam axes properly aligned?

Perform optical alignment.

"Optical Alignment" (page 3-22)

Are there objects within the protective zone?

Remove all objects from the protective zone.
Ensure the transmitter to receiver distance fall within the
specified range.

Is the transmitter to receiver distance within the
specified range?
Have dust or other particles adhered to the
detection surface, thus blocking the beam axes?

Clean the surface. Gently wipe the dirt away by using a
cloth dampened with a mild detergent.

The OSSD does not
turn ON.
(Center indicator
lights in green)

If the 7-segment display indicates "", the wait
input is active.

Correctly connect the wait input.

"Wait Input Function" (page 2-22)

When connected in series, are the beam axes for
the other GL-RHG units aligned?

Check the status of the other GL-RHG units connected in
series.

Beam axes are
aligned, but
sometimes OSSD
turns OFF.

The receiver is affected by ambient light or light
from other photoelectric devices.

Shield the receiver from ambient light.

"Light Interference Prevention Method" (page 3-11)

The synchronization wire in the communication
cable is affected by external noise.

Check for noise around the cables.

The device
connected to the
OSSD turns ON and
OFF very quickly
(chattering).

The self-diagnosis function periodically turns
OFF OSSD, so the device may be recognizing
this short OFF signal.

Connect a device that will not detect the regular OSSD
OFF signal.

"OSSD" (page 2-5)

All indicator on the
transmitter except
"POWER" turn OFF.

The GL-RHG operates in optical synchronization
system.

If you intend optical synchronization system, the
GL-RHG operates correctly and there is nothing to do. If
you do not intend optical synchronization system, check
the connection of the synchronization 1 and 2 wire in the
cable.

"Wiring System" (page 2-2)

The GL-RHG does
not go into the
muted condition
when the muting
inputs are activated.

The 7-segment display and function indicators does not change when the muting inputs are activated.

Wires are not connected correctly.

Check the connection of wires.

"2-5 Temporary Suspension of Safety Function"

(page 2-7)

External device connected to the muting inputs
is broken.

Wires for muting inputs are disconnected.

Muting inputs are broken.

Connect another external device to the muting inputs.

Connect another unit connection cable.

Connect another GL-RHG unit.

The 7-segment display and function indicators change when the muting inputs are activated.

Conditions for initiation of muting are not fulfilled.

Check the muting conditions.

"Detailed operation" (page 2-8)