Chapter 3 Electrical Wiring｜VP3000
111
8. Pr.H0-14 STO Auto Reset = 1 Enable, auto-reset is valid
The STO function is triggered after the drive runs, STO1 changes from ON (conducting) to OFF
(non-conducting), the drive stops output immediately, and starts counting after the filter time.
When the counting time of two circuits of STO are less than then allowable difference time of
STO1 / STO2 (Pr.H0-12), and the STO indication delay time (Pr.H0-13) is reached, the drive
displays STO1 fault message.
Since the STO1 fault message is invalid under the auto RESET command when the two STO
channels are both OFF (non-conductive), the drive still cannot run after receiving the RUN
command.
Figure 3-56
STO1–SCM
(Through filter)
STO2–SCM
(Through filter)
STO1–SCM
STO2–SCM
Drive status
Filter Time
No error
STO1
error/warn
Drive output
ON OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Reset command
RUN
RUN command
RUN
STOP
H0-14 STO Auto resets = 1 (STO fault automatically resets)
H0-13 STO Indn Delay Time
H0-12 STO½ Allowable Duration
H0-13 STO Indn Delay Time
H0-12 STO1/2 Allowable Duration
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