STO
‑76‑
Fault Code State
Description
Cause Corrective Action
E150.1
Status of STO1 and
STO2 inconsistent
Only one of STO1 and STO2
is in "Low" state, status of
STO1 and STO2 are
inconsistent.
The input states of STO1
and STO2 are inconsistent.
1. Ensure the requests for
disconnecting the voltage of
STO1 and STO2 are
triggered simultaneously.
2. The input circuit is
abnormal and a certain STO
input signal is still in the"H"
state after the 24 V signal is
disconnected. Contact
Inovance for technical
support.
E150.2 STO activated
OV/UV of the 5V power
supply is detected.
OV/UV of the 5V power
supply.
Restore the 5 V power
supply to normal state.
Contact Inovance for
technical support.
E150.3 STO activated
The input circuit of STO
works improperly.
The input circuit of STO
works improperly.
Fix the input circuit fault.
Contact Inovance for
technical support.
E150.4 STO activated
The buffer circuit of STO
works improperly.
The buffer circuit of STO
works improperly.
Fix the buffer circuit fault.
Contact Inovance for
technical support.
Note
● For a motor with brake, if either STO1 or STO2 closes, the drive will be disabled
within 30 ms (STO response time).
● For a motor without brake, if either STO1 or STO2 closes, the drive will be disabled
within 5 ms (STO response time).
● In the preceding two cases, if the 24V disconnection time difference between STO1
and STO2 is higher than 10 ms, the drive reports E150.1.
Application Example of Safety Function
Example 1:
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