Chapter 14 Safety Function STO
14-1-2
â– When using the internal power supply
([P24S] terminal)
â– When using an external power supply
STO status retention function (not supported as a safety function)
ï‚Ÿ The retention function that retains the STO status of internal safety path even if STO input is
canceled is not implemented as a safety circuit. Therefore, if a RUN command is given after
cancellation of STO input or STO input is canceled while the command is given, the inverter
starts output to the motor.
ï‚Ÿ Hence, to satisfy the requirement about cancellation of emergency stop specified in IEC60204-
1, either of the following measures have to be taken.
(1) At the same time as STO input, set the RUN command to the inverter to stopped status.
(2) Configure the system so that STO input to WJ-C1 is canceled when system reboot is
required by the user.
External 24 VDC power supply
Connection of STO input terminal
ï‚Ÿ STO function is disabled by the short-circuit
wire when shipped from the factory.
ï‚Ÿ Always activate the STO function using both
STO inputs ([ST1]/[ST2]).
By parameter settings, display of the keypad depending on ON/OFF status of
[ST1]/[ST2] terminals, the error display at trip, etc. can be selected. For more
information, see "14.1.3 STO Status Indication".
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