Delta C2000 Plus Series User Manual

Chapter 17 Safe Torque Off Function | C2000 Plus
17-3
17-2 Safety Torque Off Terminal Function Description
The Safe Torque Off function (STO) is to cut off the power supply to motor through the hardware,
thereby the motor could not produce torque.
The STO function controls the motor current driving signal through two hardware circuits
respectively and thus cut off the inverter power module output in order to achieve the status of safety
stop.
Operation principle Description as following table 1:
Table 1: Terminal operation description
Signal Channel Photo-coupler Status
STO signal
STO1–SCM1 ON (High) ON (High) OFF (Low) OFF (Low)
STO2–SCM2 ON (High) OFF (Low) ON (Low) OFF (Low)
Driver Output status Ready
STL2 mode
(Torque output off)
STL1 mode
(Torque output off)
STO mode
(Torque output off)
 STO means Safe Torque Off
 STL1–STL3 means Safe Torque Off hardware abnormal.
 STL3 means STO1–SCM1 and STO2–SCM2 internal circuit detected abnormal.
 STO1–SCM1 ON (High): means STO1–SCM1 has connection to a +24 V
DC
power supply.
 STO2–SCM2 ON (High): means STO2–SCM2 has connection to a +24 V
DC
power supply.
 STO1–SCM1 OFF (Low): means STO1–SCM1hasn’t connection to a +24 V
DC
power supply.
 STO2–SCM2 OFF (Low): means STO2–SCM2hasn’t connection to a +24 V
DC
power supply.

Delta C2000 Plus Series Specifications

General

Brand	Delta
Model	C2000 Plus Series
Category	DC Drives
Language	English