Manual

Gold Panther Installation Guide

MAN-G-PANIG-EC (Ver. 1.000)

|STO (Safe Torque Off) Inputs (J1)|www.elmomc.com

Table of Contents

5.2. STO (Safe Torque Off) Inputs (J1)

Activation of Safe Torque Off causes the drive to stop providing power that can cause rotation (or

motion in the case of a linear motor) to the motor.

This function may be used to prevent unexpected motor rotation (of brushless DC motors) without

disconnecting the drive from the power supply.

The motor is active only as long as 24 VDC (or 5 V for the TTL option) is provided to both STO1 and

STO2. Whenever any input voltage is no longer present, power is not provided to the motor and the

motor shaft continues to rotate to an uncontrolled stop.

In circumstances where external influences (for example, falling of suspended loads) are present,

additional measures such as mechanical brakes are necessary to prevent any hazard.

This function corresponds to an uncontrolled stop in accordance with Stop Category 0 of IEC 60204-

Note: This function does not protect against electrical shock, and additional measures to turn

the power off are necessary.

The following table defines the behavior of the motor as a function of the state of the STO inputs:

Signal – STO1 Signal – STO2 Function

Not Active Not Active Motor is disabled

Not Active Active Motor is disabled

Active Not Active Motor is disabled

Active Active Motor can be enabled

Table 10: Motor Behavior According to Safety Inputs

Note: In the Gold Panther, STO1 also latches a software disable condition.

Pin (J1) Signal Function

14 STO1 Safety 1 input (default 24 V)

13 STO2 Safety 2 input (default 24 V)

12 STO_RET Safety signal return

Table 11: Safety Inputs Pin Assignments

See Figure 11 for the PLC option connection and Figure 12 for the TTL option connection.