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Safety Precautions
G9SX
USER'S GUIDE
97
Preca
utions
Safety Distance
The safety distance is the minimum distance that must be
provided between the safety input device and a machine's
hazardous part to stop the hazardous part before a person or
object reaches it. The safety distance varies according to the
standards of each country and the specifications of each machine.
In addition, the calculation of the safety distance differs if the
direction of approach is not perpendicular to the detection zone of
the safety input device. Always refer to the relevant standards.
Safety Distance Concepts
Safety Distance Calculation Examples (Reference)
( 1 ) To determine the approach speed K1, consider all factors,
including the operator's physical abilities.
( 2 ) To determine the maximum approach speed K2, consult
with a notified body or other authoritative institutes.
( 3 ) The response time of a machine is the time from when the
machine receives a stop signal to the time when the
machine's hazardous part stops. Measure the response
time on the actual system. Also, periodically check that the
machine's response time has not changed.
( 4 ) For information on the response time of the G9SX system,
refer to item 10 of
Precautions for Correct Use
on page 98.
■
Precautions for Safe Use
<Precautions for All G9SX Models>
( 1 ) Use G9SX within an enclosure with IP54 protection or
higher of IEC/EN60529.
( 2 ) Incorrect wiring may lead to loss of safety function. Wire
conductors correctly and verify the operation of G9SX before
commissioning the system in which G9SX is incorporated.
( 3 ) Do not apply DC voltages exceeding the rated voltages, or
any AC voltages to the G9SX power supply input.
( 4 ) Use DC supply satisfying requirements below to prevent
electric shock.
•
DC power supply with double or reinforced insulation, for
example, according to IEC/EN60950 or EN50178 or a
transformer according to IEC/EN61558.
•
DC supply satisfies the requirement for class 2 circuits or
limited voltage/current circuit stated in UL 508.
( 5 ) Apply properly specified voltages to G9SX inputs.
Applying inappropriate voltages cause G9SX to fail to
perform its specified function, which leads to the loss of
safety functions or damages to G9SX.
( 6 ) Auxiliary error outputs and auxiliary monitoring outputs are
NOT safety outputs. Do not use auxiliary outputs as any
safety output.
Such incorrect use causes loss of safety function of G9SX
and its relevant system.
Also Logical AND connection outputs can only be used for
logical AND connections between G9SXs.
( 7 ) After installation of G9SX, qualified personnel should
confirm the installation, and should conduct test operations
and maintenance.
The qualified personnel should be qualified and authorized
to secure the safety on each phases of design, installation,
running, maintenance and disposal of system.
( 8 ) A person in charge, who is familiar to the machine in which G9SX
is to be installed, should conduct and verify the installation.
( 9 ) Perform daily and 6-month inspections on the G9SX.
Otherwise, the system may fail to work properly, resulting in
serious injury.
(10) Do not dismantle, repair, or modify G9SX. It may lead to
loss of its safety functions.
(11) Use only appropriate components or devices complying
with relevant safety standards corresponding to the
required level of safety categories.
Conformity to requirements of safety category is
determined as an entire system.
It is recommended to consult a certification body regarding
assessment of conformity to the required safety level.
(12) OMRON shall not be responsible for conformity with any
safety standards regarding to customer's entire system.
(13) Disconnect G9SX from power supply when wiring, to
prevent electric shock or unexpected operation.
Doing so may lead to the loss of its safety functions.
(14) Be cautious not to have your fingers caught when attaching
terminal sockets to the plugs on G9SX.
(15) Do not use in combustible gases or explosive gases.
When a person
approaches a
hazard (machine)
•
S1: Safety distance 1
•
P1: The closest that a machine can come to a person
while operating (the boundary of the machine's
operating area)
When a hazard
(machine)
approaches a
person
•
S2: Safety distance 2
•
P2: The closest that a part of a person can come to a
machine.
Calculating the
safety distance
specified by
international
standard ISO 13855-
2002 (European
standard EN 999-
1999)
If a person approaches the detection zone
perpendicularly, calculate the safety distance as
shown below.
S1 = K1
×
T + C
S2 = K2
×
T + C
S1:
Safety distance 1
S2:
Safety distance 2
K1:
Approach speed of a person to the detection
zone (area A)
K2:
Maximum approach speed of a machine to the
detection zone (area A)
T:
Total response time of the machine and G9SX
system
C:
Additional distance calculated by the detection
capability (the diameter of the smallest
detectable object) of the Safety Sensor.
Calculating the
safety distance
specified by
American standard
ANSI B11.19
If a person approaches the detection zone
perpendicularly, calculate the safety distance as
shown below.
S1 = K1
×
(Ts + Tc + Tr + Tbm) + Dpf
S2 = K2
×
(Ts + Tc + Tr + Tbm) + Dpf
S1: Safety
distance
1
S2: Safety
distance
2
K1:
Approach speed of a person to the detection
zone (area A)
K2:
Maximum approach speed of a machine to the
detection zone (area A)
Ts:
Machine's stop time (s)
Tr:
Response time of the G9SX system from ON to
OFF (s)
Tc:
Machine control circuit's maximum response
time required to activate its brake (s)
Tbm: Additional time (s)
Dpf:
Additional distance
Person
Machine
P1
S1
Safety Sensor A
Safety Sensor B
Area A
Person
Machine
S2
P2
Safety Sensor A
Safety Sensor B
Area A
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