Appendix G Conformity with Standards
Appendix-51
[ 2 ] Notes for compliance with functional safety standards
1) Safety Requirements
All of the following requirements must be met in order to comply with functional safety.
1-1) Installation
- Turn off both SW7 on the control PCB.
- Install the inverter in a cabinet with a protective enclosure IP54 or higher.
- Also comply with the European standard EN 61800-5-1 and EN 61800-3 as inverters or mechanical equipment.
- To ensure redundancy, wire the terminals [EN1] and [EN2] independently.
- For ON/OFF of terminals [EN1] and [EN2], use a safety component with EN ISO 13849-1 Cat.3 PL:e or higher.
- When using an external power supply, use a SELV power supply.
1-2) STO test
- Check that STO operates properly once every three months.
2) Notes for using STO
- When constructing a product safety system in STO, the machinery manufacturer is responsible for the product
safety system required by the machinery manufacturer to conduct a risk assessment of the entire machinery
equipment, including other equipment, devices, and wires, as well as the external equipment and wires connected
to the terminals [EN1][EN2], to ensure that the entire machinery equipment conforms to that product safety
system. Also, for preventive maintenance, be sure to perform periodic inspections to confirm that the product
safety system operates properly.
- Input short pulses to terminal [EN1] and [EN2] for less than 1 ms when performing a diagnosis with the safety
PLC.
If a single fault is detected in the inverter, an alarm is output to the external device and the inverter coasts the
motor even if the terminal [EN1] and [EN2] are ON. (The alarm outputting function is not guaranteed to be outputted
with all single faults, but can be adapted to EN ISO 13849-1 Cat.3 PL:e.)
- The logical discrepancy due to the signal delay between the terminals [EN1] and [EN2] should be 50ms or less.
Outputs an eCf alarm when it exceeds 50 ms.
3) Wiring for terminal [EN1], [EN2]
- The terminal [EN1] and [EN2] are used to wire the safety circuitry. Since the reliability is obtained by connecting
each signal independently, be careful not to short-circuit the signal in the middle of wiring.
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