INVT Goodrive350-19 Series User Manual

Goodrive350-19 series VFD STO function description
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Appendix E STO function description
Reference standards: IEC 61508-1, IEC 61508-2, IEC 61508-3, IEC 61508-4, IEC 62061, ISO
13849-1, and IEC 61800-5-2
You can enable the safe torque off (STO) function to prevent unexpected startup when the main
power supply of the drive is not switched off. The STO function switches off the drive output by turning
off the drive signals to prevent unexpected motor startup (see the following figure). After the STO
function is enabled, you can perform short-time operations (such as non-electrical cleaning in the
lathe industry) and maintain the non-electrical components of the device without powering off the
drive.
Control
circuit
+24V
Switch, relay, etc.
UDC+
UDC-
Drive
circuit
PWM+
PWM-
U/V/W
H1
H2
Note:
The contacts of the safety switch must be opened
or closed within 250 ms; and the cable that
connects the VFD to the safety switch cannot be
longer than 25 m.
COM
E.1 STO function logic table
The following table describes the input states and corresponding faults of the STO function.
STO input state
Corresponding fault
H1 and H2 opened
simultaneously
The STO function is triggered, and the drive stops running.
Fault code:
40: Safe torque off (STO)
H1 and H2 closed
simultaneously
The STO function is not triggered, and the drive runs
properly.
One of H1 and H2 opened, and
the other closed
The STL1, STL2, or STL3 fault occurs.
Fault code:
41: Channel H1 exception (STL1)
42: Channel H2 exception (STL2)
43: Channel H1 and H2 exceptions (STL3)
E.2 STO channel delay description
The following table lists the trigger and instruction delay of the STO channels.

INVT Goodrive350-19 Series Specifications

General

Brand	INVT
Model	Goodrive350-19 Series
Category	DC Drives
Language	English