Appendix G Sto Function Codes; Sto Function Logic Table - INVT Goodrive390L Series User Manual

Goodrive390L Series Lift-Dedicated VFD
This product is equipped with STO function as standard with the safety input ports +24V,
H1, and H2. The port +24V is short connected to H1, H2 in the factory.
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 startups 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 startups of the motor
(see the following figure). After the STO function is enabled, you can perform some-time
operations (such as non-electrical cleaning in the lathe industry) and maintain the
non-electrical components of the device without switching off the drive.
Control
circuit
G.1 STO function logic table
The following table describes the input states and corresponding faults of the STO
function.
STO input state
H1 and H2 opened simultaneously
202403 (V1.0）

Appendix G STO function codes

Figure G-1 Principle diagram of STO function
+24V
H1
H2
COM
UDC+
PWM+
Drive
circuit
PWM-
UDC-
The STO function is triggered, and the drive stops
running.
Fault code:
40: STO fault (E40)
Switch, relay, etc.
U/V/W
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.
Corresponding fault
STO function codes
214