Quick Start Guide for ST600 Series Frequency Inverters Terminals
6
Digital Input:
Internal impedance: 3.3kΩ
12–30V voltage input is acceptable
Bidirectional input terminals, supporting both NPN and PNP connection methods
Max. input frequency: 1kHz
Programmable digital input terminals, the exact functions of which can be set via related
parameters
Channels for Both High Frequency Pulse Input and Digital Input:
Max. input frequency: 50kHz
Duty ratio: 30%–70%
Supports quadrature encoder input when both HDIA and HDIB are available, with the speed
measurement function
Safe Torque Off (STO) Inputs:
Redundant STO input, connected to the external NC contact. When the contact opens, STO
is activated and the VFD stops the output.
Shielded cables with a maximum length of 25m are used for the safety input signal cables.
Terminals H1 and H2 are short-circuited to +24 V by default. Remove the jumper from the
terminals before using the STO function.
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