Function Applications
-536-
Table 4–45 STO function
STO1 input STO2 input
PWM signal
H H
Normal
L H
Disabled
H L
Disabled
L L
Disabled
Table 4–46 STO description
Item
Description
Definition Used to cut off the power of the engine.
Description
The STO function enables the equipment to safely enter a torque-free
state and prevents accidental start-up. If the STO function is activated
when the motor is running, the motor gradually stops.
Safety state Used to disable the PWM gating signal of the AC drive.
Operation mode High requirements or continuous mode
Example of Safety Function
Direct stop with stop category 0 and STO
Figure 4-72 Example of safety function
Safety Function Monitoring
The LED display displays the selected mode, status, and fault code of the AC drive, as listed in the table
below.
Table 4–47 Fault codes related to the STO function
Fault Code
State
Description
ST0
External request to activate the STO
function
STO1/STO2 are all in the "Low" state.
E47.02
STO1/STO2 state inconsistent Only one of STO1 and STO2 is in 'Low' state. The
states of STO1 and STO2 are inconsistent.
E47.03
Activated STO diagnostic OV/UV of 5 V power supply is detected.
E47.04
Activated STO diagnostic The STO input circuit is abnormal.
E47.05
Activated STO diagnostic The STO blocking output chip is abnormal.
Exiting the STO State
F9-13 can be set to select the safe state exiting mode when the AC drive enters the safety state through
the STO function.
● When F9-13 is set to 0, the manual reset mode is used (default state).
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