KEYENCE GL-RHG Series - Manual (Page 6)

4 GL-RHG-M-NO0-E
 Circuit design and wiring
DANGER
• When the reduced resolution function is applied, the detection capability varies
according to your configuration. Make sure to accurately calculate the safety distance
according to the detection capability, and install the GL-RHG at a distance greater than or
equal to the minimum safety distance away from the hazardous zone or hazard. The
installation of additional safety measures, such as safeguarding, may be required if the
detection capability varies due to the configuration of reduced resolution. On your own
responsibility, you must perform the risk assessment based on your configuration of
reduced resolution in order to reduce the risk.
• When the fixed blanking function is applied, a hazardous clearance that is not protected
by the GL-RHG may be generated between the obstacle and the GL-RHG. You must install
an additional safety measure such as a safeguard for this clearance.
• The override is a function to allow a temporary manual suspension of the safety functions
of the GL-RHG. Therefore, additional safety measures are required for the whole machine
system on which the GL-RHG is installed in order to ensure safety while the override is
activated.
• Securely tighten mounting brackets and cable connectors used for the installation of the
GL-RHG in accordance with the torque values specified in this user's manual.
• When optical synchronization system is applied and Channel A or B is configured, the
response time is longer than the other case. Make sure to accurately calculate the safety
distance according to the response time, and install the GL-RHG at a distance greater
than or equal to the minimum safety distance away from the hazardous zone or hazard.
DANGER
• Always turn off the power to the GL-RHG when performing electrical wiring.
• You must fulfill the electrical standards and regulations in the country or region in which
the GL-RHG is being used when you perform the electrical wiring.
• To avoid the risk of electric shock, do not connect any of the GL-RHG inputs to DC power
sources outside of the range of 24 V DC + 20% or to any AC power source.
• To avoid the risk of electric shock, be sure that any hazardous voltage is isolated from all
wiring of the GL-RHG with reinforced insulation or double insulation.
• In order to fulfill the requirements in IEC61496-1, UL61496-1, EN61496-1 and UL508, the
power supply for the GL-RHG must fulfill the conditions listed below.
(a) A rated output voltage of 24 V DC (SELV, Overvoltage Category ) within ±20%.
(b) Double insulation or reinforced insulation between the primary and secondary
circuits.
(c) Output holding time of 20 ms or more.
(d) A power supply must fulfill the requirements of the electrical safety and
electromagnetic compatibility (EMC) regulations or standards in all countries
and/or regions where the GL-RHG is used.
(e) A secondary circuit of power supply (output) must fulfill the requirements for
Class 2 Circuits or Limited Voltage/Current Circuits specified in UL508, if the GL-
R is used in the United States or Canada.
• Do not install the electric wiring of the GL-RHG together with or in parallel with any high-
voltage electrical or power lines.
• Both OSSD outputs provided on the GL-RHG must be used to establish a safety-related
machine control system. Establishing a safety-related machine control system with just one
of the OSSD outputs cannot stop the machine due to an OSSD output malfunction and may
result in significant harm to the machine operators, including serious injury or death.
• When using PNP output type cables, do not cause a short-circuit between the OSSD and
+24 V. Otherwise, the OSSDs keep staying at the ON-state and it causes a dangerous
situation.