Omron G9SX Series Manual page 46

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 Sensor A
When a
person Area A
approaches
Safety Sensor B
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
Safety Sensor A
hazard
(machine) Area A
approaches
Safety Sensor B
a person
• S2: Safety distance 2
• P2: The closest that a part of a person can come
to a machine.
Safety Distance Calculation Examples (Reference)
If a person approaches the detection zone
perpendicularly, calculate the safety distance
as shown below.
S1 = K1 × T + C
S2 = K2 × T + C
Calculating the
S1: Safety distance 1
safety distance
S2: Safety distance 2
specified by
K1: Approach speed of a person to the
international
detection zone (area A)
standard ISO K2: Maximum approach speed of a machine to
the detection zone (area A)
13855
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.
If a person approaches the detection zone
perpendicularly, calculate the safety distance
as shown below.
S1 = K1 × (Ts + Tc + Tr + Tspm) + Dpf
S2 = K2 × (Ts + Tc + Tr + Tspm) + Dpf
S1: Safety distance 1
Calculating the
S2: Safety distance 2
safety distance
K1: Approach speed of a person to the
specified by
detection zone (area A)
American
K2: Maximum approach speed of a machine to
standard ANSI the detection zone (area A)
B11.19 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
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 47.
Machine
P1
S1
Person
Machine
S2
P2
Person
Precautions for Safe Use
<Precautions for All G9SX Models>
1. Use G9SX within an enclosure with IP54 protection or higher of
IEC60529.
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,
damages to G9SX, or burning.
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. Inspect the G9SX daily and every six months. Incorrect system
operation may result in serious injury.
10. Do not dismantle, repair, or modify G9SX. It may lead to loss of its
safety functions, creating a dangerous situation.
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.
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.
G9SX/G9SX-GS
46