Checklist before operation, E gl-rhg-im, If the gl-rhg is not in an error condition – KEYENCE GL-RHG Series User Manual
Page 9: Inspection before operation (initial inspection)
9
E GL-RHG-IM
*1 All indicators on the transmitter may turn OFF.
If the GL-RHG is not in an error condition
If the OSSD is not functioning normally, perform the following measures regardless of whether the
display lights indicate that the GL-RHG is in an error condition or not.
Checklist before operation
You are fully responsible for performing the risk assessment on your machine application, taking into
account performing maintenance and inspections, which are a critical factor for appropriate risk
assessment. In addition, it is the responsibility of the responsible personnel to train the machine
operators regarding inspection and maintenance of the machine and the GL-RHG.
Inspection before operation (Initial inspection)
When installation of the GL-RHG is completed, the responsible personnel must verify the operation of
the GL-RHG in accordance with the checklist shown below. Note that the following inspection items
comprise only a bare minimum inspection. KEYENCE Corporation strongly recommends including the
necessary checking items into this checklist based on the judgment of the responsible personnel since
additional criteria may be necessary depending on both the machine to which the GL-RHG is installed
and the laws, rules, regulations and standards in the country or region in which the GL-RHG is used/
installed.
(1) Pre-check for installation condition
The machine under GL-RHG control can be caused to stop running by the OFF-state of OSSD.
The GL-RHG is installed so that the machine operator cannot go into or approach the hazardous
area without passing through the protective zone.
The device to activate the override is installed so that it cannot be operated if there are any personnel
within the hazardous area.
The GL-RHG has been installed at a distance greater than or equal to the minimum safety distance
required.
If there are glossy surfaces nearby, move them so that they are beyond the minimum installation
distance according to "Installation Distance From Glossy Surfaces".
The GL-RHG is installed at a location free from light interference, for example fluorescent lamps.
The transmitters and receivers are paired correctly.
The beam axis spacing (detection capability) is the same between the transmitter and the receiver
when installing the GL-RHG.
The muting devices fulfill the conditions specified in this manual and the requirements of the laws,
rules, regulations and standards in the country or region in which the GL-RHG and those devices are
used.
The devices used to activate the override fulfill the conditions specified in this manual and
requirements of the laws, rules, regulations and standards in the country or region in which the
GL-RHG and those devices are used.
Risk assessment was performed on your own responsibility based on your machine application, and
then the installation of GL-RHG was also based on its result.
(2) Pre-check for wiring
The GL-RHG power supply is 24 V DC, fulfill the conditions for the power supply as specified in this
manual.
The transmitter and receiver cables are installed correctly.
The two of OSSD outputs provided in the GL-RHG are both used as a safety-related machine control
system.
The polarity is not reversed with the connection to the power supply.
In case of using PNP output type cable, the OSSD is not short-circuited to +24V, and the load is
between the OSSD and 0V.
In case of using NPN output type cable, the OSSD is not short-circuited to 0V, and the load is
between the OSSD and +24V.
When two or more GL-RHG are connected in series, they are connected using the dedicated series
connection cable, which is not cut or extended.
AUX output and error output are not used as a safety output to the safety-related control system.
The cable sheaths are not damaged. The protection against the disconnection or short-circuit of
cable, which might be caused by crushing or being caught in a machine, is taken into account.
If two or more sets of the GL-RHG units are used in the vicinity of each other, the protection
measures against light interference is done through a series connection method or light interference
prevention method.
All of NON-SAFETY-RELATED functions described in this manual are not a part of / whole of safety-
related machine control system.
(3) Pre-check test while the machine is stopped.
You should do the following pre-check test with the test piece in order to make sure the operation of the
GL-RHG while the machine is stopped.
The OSSD indicator on the GL-RHG lights in red and the OSSD turns OFF while the test piece is present
in the protective zone. The following figure shows the movement procedure of the test piece.
The OSSD indicator and all bar LEDS light in green if no test piece is present in the protective zone.
When the EDM function is applied, the GL-RHG goes to an error condition and the OSSD indicator
on the GL-RHG lights in red if the EDM input opens while the test piece is present in the protective
zone.
(4) Pre-check test while the machine is operating.
The purpose of this pre-check test is to make sure that the machine (hazards) stops its operation. This
test must be done after you completely make sure that there is nobody in the hazardous zone.
The machine stops if the test piece is present in the protective zone. It is recommended to try three
locations of test piece: near the transmitter, near the receiver, and in the central area of the protective
zone.
The machine (hazard) still stops its operation as long as the test piece is present in the specified
detection zone. This test should be done for the whole protective zone.
The machine (hazard) stops its operation when the power for the GL-RHG is disconnected.
Minimum safety distance is ensured, which has been calculated according to the laws, regulations,
and standards of the country and region in which the GL-RHG is installed.
OSSD1 error
OSSD2 error
When the error is cleared by restarting the GL-RHG.
OSSD is affected by
external noise.
Check for a noise source (inverter, servomotor, etc.)
around the GL-RHG installation location and cables.
There is a voltage surge
affecting the OSSD due to
an inductive load.
When the load is inductive such as relay, use a load
with a surge absorption device.
The power supply voltage
has fallen continuously or
experienced a sudden
drop.
Take measures by replacing the power supply,
increasing the power capacity, or dedicating the power
supply to the GL-RHG.
When the error is not cleared by restarting the GL-RHG.
•
OSSD is short-circuited
to 0 V or 24 V of power
supply.
•
OSSDs are short-
circuited to each other.
•
OSSD is short-circuited
to other wires.
Rewire the OSSD correctly.
Too much current is
flowing through the OSSD.
Check that the load does not consume more current
than the OSSD can handle.
OSSD is broken.
Replace the receiver.
Sub unit error
The sub unit is broken.
Replace the sub unit.
When the error is cleared by restarting the GL-RHG.
The sub unit or series
cable is affected by
external noise.
Check for a noise source (inverter, servomotor, etc.)
around the GL-RHG installation location and cables.
Communication error
*1
When the error is cleared by restarting the GL-RHG.
The synchronization wire is
not wired correctly or is
disconnected.
Check the connection of the synchronization wire.
The synchronization lines
in the cable are affected by
external noise.
Check for a noise source (inverter, servomotor, etc.)
around the GL-RHG installation location and cables.
The power supply voltage
has fallen continuously or
experienced a sudden
drop.
Take measures by replacing the power supply,
increasing the power capacity, or dedicating the power
supply to the GL-RHG.
When the error is not cleared by restarting the GL-RHG.
The synchronization wire is
not connected correctly or
is disconnected.
Check the connection of the synchronization wire.
The connection with the
GL-RHG in series is
broken.
Replace the GL-RHG unit connected in series.
:
System error
The power supply voltage
has fallen continuously or
experienced a sudden
drop.
Take measures by replacing the power supply,
increasing the power capacity, or dedicating the power
supply to the GL-RHG.
The GL-RHG is broken.
Replace the GL-RHG.
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.
Cables are disconnected or not connected
correctly
Check the connection and reconnect the cables
if necessary.
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.
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.
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"
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.
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.
Indication
Error name
Cause
Check and corrective action
Start
Stop