Function Applications
-537-
When all the following conditions are met at the same time, the safety state can be cleared and the
AC drive resumes normal operation.
1. The input state of STO must be "high" for both channels.
2. The AC drive is manually reset to clear the STO state.
● When F9-13 is set to 1, the automatic reset mode is used.
When the following condition is met, the safety state can be cleared and the AC drive resumes
normal operation.
The input state of STO must be "high" for both channels.
4.7.7 Troubleshooting
See the following table for the causes and solutions of failures. If the problem cannot be solved
through the solutions in the following table, contact the agent or Inovance for technical support.
Table 4–48 Fault causes and solutions
Fault Code Possible Cause Solution
ST0
STO1/STO2 is not connected to 24 V
input voltage.
Connect STO1 and STO2 to 24 V input voltage signals.
E47.02
The input states of STO1 and STO2
are inconsistent.
1 Ensure that STO1 and STO2 voltage disconnection
requests are triggered at the same time.
2 The input circuit is abnormal. After disconnecting the
24 V signal, an STO input signal is still in "High" state. In
this case, contact the agent or Inovance for technical
support.
E47.03
OV/UV of 5 V power supply is
detected.
Recover the 5 V power supply to normal state. Contact
the agent or Inovance for technical support.
E47.04
The STO input circuit is abnormal. Contact the agent or Inovance for technical Support.
E47.05
The STO pre-charge circuit is faulty. Contact the agent or Inovance for technical support.
4.7.8 Preventive Measures
This section describes the information required before starting operation. Before operation, read the
following safety precautions, risk assessment information, and restriction information, and use the
safety features only after you have properly understood all the information.
Safety Measures
Carefully read and observe the following important precautions when using safety features:
● The STO function is not a substitute for the emergency stop (E-stop) function. If no other measures
are taken and the power supply cannot be cut off in case of emergency, the high voltage parts of
motors and AC drives are still live, which brings the risk of electric shock or other risks caused by
electricity. Therefore, the maintenance of electrical parts of the AC drives or motors can be
implemented only after the AC drive system is isolated from the main power supply.
● STO may be used as an integral part of an E-stop system, depending on the standards and
requirements for a particular application. However, it is mainly used for a dedicated safety control
layout to prevent hazards, not as the E-stop function.
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