DOC-0017-04-EN: AC20 Series - Hardware Installation Manual
DOC-0017-04-EN-A 22.03.2023 77 (154)
Technical Specification
Terminal Idents:
STOA, STOB, referenced to 0V
Nominal Input Voltage:
24V PELV (with energy source class 3, according to IEC 62368-1)
Maximum Input Voltage:
25.2V (26.4V in a maximum operating ambient of 40°C)
Recommended Input
Voltage for Logic Low
Level:
0V – 5V (or open circuit)
Recommended Input
Voltage for Logic High
Level:
15V – 24V
Indetermined Input
5V – 15V, function is undefined
Always Active (i.e., STO cannot be disabled by the drive firmware)
STO User Input A Logic
0V or open circuit = STO Activated
24V = STO Disabled
STO User Input B Logic
0V or open circuit = STO Activated
24V = STO Disabled
Isolation:
Channel A & B to SELV: Galvanic Isolation.
Channel A to Channel B: Non-isolated
8.5 STO Safety Warnings & Limitations
Ignoring the following may result in serious
• Only competent personnel are permitted to install the STO function
and commission it. They must disseminate and make available all
appropriate instructions and documentation to all personnel who may
come into contact with or operate the STO and provide suitable
training on the inverter to ensure it is operated in the correct manner
and to avoid damage, injury or loss of life.
Personnel with many years of experience in the field of machine safety
with inverters is expected.
Planning, installation and initial system commissioning requires a
detailed understanding in this area.
• Standards and accident prevention regulation associated with the
application must be known and respected as well as risks, protective
and emergency measures.
• We assume that these specialists have a good knowledge of English.
In the case of deviating regulations (in particular work by persons who
do not speak English), the machine manufacturer must provide these
persons with the necessary information in the national language.
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