Safe Torque Off (Sto) Port - Leadshine EL8-EC Series User Manual

2.11 Safe Torque Off (STO) Port

Port
8
7
2
1
Introduction to Safe Torque Off (STO)
Function: Cut off motor current supply physically (through mechanical means)
STO module (CN6 connector) consists of 2 input channels. It cuts off the motor current
supply by blocking of PWM control signal from the power module. When the motor current
is cut off, the motor will still move under inertia and stops gradually.
The STO function is set up ready to be used by factory default. Please remove STO
connector if it is not needed.
STO functional principle
STO module cuts off the motor current supply and stops motor gradually by blocking of
PWM control signal from the power module through 2 isolated circuits. When a STO error
occurs, the actual status of STO can be determined by the EDM status feedback.
SF1 Input
Status
ON
ON
OFF
OFF
Pin Signal Description
1 24V 24v power supply
2 0V Reference ground
Control
3 SF1＋
positive input
Control
4 SF1－
negative input
Control
5 SF2＋
positive input
Control
6 SF2－
negative input
EDM
External
7
＋
device (EDM)
EDM differential
8
－
ended output
SF2 Input EDM Output
Status
ON
OFF
ON
OFF
User manual of EL8-EC***F AC Servo
Connect to SF1 and SF2
when not in use. Do not use
to supply power.
signal 1
signal 1
When SF1 = OFF or SF2 =
OFF,STO is enabled.
signal 2
signal 2
monitoring
When SF1 = OFF or SF2 =
with
OFF,EDM = ON
double
PWM control
Status
OFF Normal
OFF Blocked
OFF Blocked
ON Blocked
Remarks
Alarm code
signal
Er 1c2
Er 1c1
Er 1c0
-
40