Parker 638 series

9 Safe
Safe Safe
Safe Torque
TorqueTorque
Torque Off (STO)
Off (STO)Off (STO)
Off (STO)
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● Status Diagram and Function of Terminals STO1# und STO2#
• With hardware monitoring of the contact difference between STO1# und STO2#
(Tolerance - ca. 20 Sec.)
• Active Time Delay t
va
> 0
• No additional special functions
Diagram: Flow chart of the switching status from STO1# and STO2#
Note for Standard Operation:
• The STO inputs should always be operated simultaneously.
If the safety parameter Active Time Delay is t
va
= 0 s, then both STO inputs will be turned on
immediately after recognition.
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