KEYENCE GL-RHG Series - Manual (Page 7)

5 GL-RHG-M-NO0-E
Testing and maintenance
DANGER
• When using PNP output type 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 the OSSD operation will be reversed and the OSSD will change to an ON
state when the GL-RHG detects an interruption in the protective zone. This is a dangerous
situation.
• When using NPN output type cables, do not cause a short-circuit between the OSSD and 0 V.
Otherwise, the OSSDs keep staying at the ON-state and it causes a dangerous situation.
• When using an NPN output type cable, 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 the OSSD operation will be reversed and the OSSD will change
to an ON state 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 systems. Usage of these functions as safety outputs may result
in significant harm to the machine operators, including serious injury or death.
• The wait input is not allowed to be connected to the output from any components
comprising a part of the safety-related machine control system. If the wait input is
connected to the output of a safety component it may result in significant harm to the
machine operators, including serious injury or death.
• The transmitter and receiver cables must be within the lengths specified in this user's
manual. Usage of cables longer than the specified length may cause the improper
operation of safety functions and may cause a dangerous situation.
DANGER
• You must always perform the pre-check test in accordance with the checklist, after
maintenance, adjustment or alignment of the target machine or the GL-RHG and before
the machine startup.
• If the GL-RHG does not operate properly when you perform a pre-check test in
accordance with the checklist specified in this user's manual, do not operate the
machine.
• You must periodically examine the machine to verify that all brakes, other stop
mechanisms, and control devices operate reliably and correctly in addition to checking
the GL-RHG.
• The responsible personnel must perform maintenance procedures as specified in this
user's manual to ensure safety to the machine and GL-RHG.