Grounding Of Protective Shields - ABB ACS560 Hardware Manual

198 The Safe torque off function
Note: The voltage at the STO input terminals of the drive must be at least 13 V DC
to be interpreted as "1".
The pulse tolerance of the input channels is 1 ms.
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Grounding of protective shields

• Ground the shield in the cabling between the activation switch and the control
unit at the control unit only.
• Ground the shield in the cabling between two control units at one control unit
only.