KEYENCE GL-RHG Series - Manual (Page 72)

4-2 GL-RHG-M-NO4-E
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Precautions on Wiring and Power Supply
Power supply
In order to meet the requirements laid out in IEC61496-1, UL61496-1, EN61496-1 and UL508, the power
supply for the GL-RHG must meet the conditions listed below.
• A rated output voltage of 24 V DC (SELV, Overvoltage Category ) within ±20%.
• Double insulation or reinforced insulation between the primary and secondary circuits.
• Output holding time of 20 ms min.
• A power supply must meet 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.
• A secondary circuit of power supply (output) must meet the requirements for Class 2 Circuits or Lim-
ited Voltage/Current Circuits specified in UL508, if the GL-RHG is used in United States or Canada.
DANGER
• The two OSSD outputs provided in the GL-RHG must both be used to establish a safety-
related machine control system. Establishing a safety-related machine control system
with just one OSSD output cannot be done because a potential OSSD output malfunction
could result in significant harm to the machine operators, including serious injury or
death.
• When using PNP output cables, do not cause a short circuit between the OSSD output
and +24 V. Otherwise, OSSDs stay ON and create a dangerous situation.
• When using PNP output cables, be sure to connect the load between the OSSD and 0 V to
avoid a dangerous situation. If the load is incorrectly connected between the OSSD and
+24 V, the logic of OSSD operation will be reversed, and then turn ON when the GL-RHG
detects the interruption in the protective zone. This is a dangerous situation.
• When using NPN output cables, do not cause a short circuit between the OSSD output
and 0 V. Otherwise, OSSDs stay ON and create a dangerous situation.
• When using NPN output cables, be sure to connect the load between the OSSD and + 24 V
to avoid a dangerous situation. If the load is incorrectly connected between the OSSD and
0 V, the logic of OSSD operation will be reversed, and the OSSD will turn ON when the
GL-RHG detects the interruption in the protective zone. This is a dangerous situation.
• Regardless of whether the cables are PNP or NPN type, you must fulfill the requirements
of Clause 9.4.3 in IEC60204-1: 2005 for protection against maloperation due to earth fault.
• All outputs, other than OSSDs, are not allowed to be used as safety outputs for a safety-
related machine control system. Usage of these output functions, other than OSSDs, as a
safety output could result in serious injury or death.
• 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.
• Do not install the electric wiring of the GL-RHG together with or in parallel with any high-
voltage electrical or power lines.
NOTICE
If the power supply for the GL-RHG is shared with other electronic devices, voltage
reduction to the GL-RHG may occur due to the temporary increase of the current
consumption on these devices, or the GL-RHG may be affected by the noise generated by
these devices. When these situations occur, the GL-RHG may go into error condition. It is
therefore strongly recommended that the power supply for the GL-RHG is dedicated solely
for use with the GL-RHG, the muting device connected to the GL-RHG and the load for the
GL-RHG. It should not be shared with other machines, devices or electronic devices.