[X14] / [X15] STO (Safe torque off) / Transmission STO (Safe torque off)

DANGER

Danger to life due to unexpected movements!

The drive will be torque-free in the status 'Safe torque off (STO)', in case of mains failure or in case of faulty drive controller. External application of force on the drive axis may result in life-threatening movements (e.g. hanging axes can fall down).

Steps to prevent:

Install an external, mechanical brake that prevents a movement.
Install a counterweight in order to maintain the axis in balance.

DANGER
	Danger to life from touching electrical connections! In the status 'Safe torque off (STO)', the pulses for controlling of the output stage are blocked, the device remains connected to the mains (no automatic mains separation). Electrical terminals and connectors carry further voltages that may cause death or serious injury upon contact. Steps to prevent: Provide shock-hazard protection Prior to any work on the device: Turn off the main switch to disconnect the power supply, and secure switch against being turned on again. Wait at least 5 minutes for components to discharge. Connection or disconnection of terminals is only allowed if they are free of voltage. Measure the terminals voltage to verify that the terminal is de-energized. One suitable measuring point is the DC bus between the UZP and UZN terminals.

DANGER

Danger to life from touching electrical connections!

In the status 'Safe torque off (STO)', the pulses for controlling of the output stage are blocked, the device remains connected to the mains (no automatic mains separation). Electrical terminals and connectors carry further voltages that may cause death or serious injury upon contact.

Steps to prevent:

Provide shock-hazard protection
Prior to any work on the device: Turn off the main switch to disconnect the power supply, and secure switch against being turned on again.
Wait at least 5 minutes for components to discharge.
Connection or disconnection of terminals is only allowed if they are free of voltage.
Measure the terminals voltage to verify that the terminal is de-energized. One suitable measuring point is the DC bus between the UZP and UZN terminals.

Assignment
[X14] / [X15]	Connection	Signal	Description
front view, device side	X14	STO	24 VDC supply voltage for STO (Safe torque off)
	X14	STO_GND	Reference potential for STO
	X15	STO	Transmission - 24 VDC supply voltage for STO (Safe torque off)
	X15	STO_GND	Transmission - Reference potential for STO

Technical data

Description	In regular operation, input 'STO' must be set to "1" to enable the power output stage (STO inactive). STO input is equal to "0" activates STO. If STO active is requested (STO = "0"), the motor is safely, immediately and automatically separated from the energy supply in the inverter. The IGBT control is safely interrupted and the motor is certainly prevented from starting unexpectedly. If STO is requested while moving (STO = "0"), the drive coasts to stop and the error message 2320 is generated. X14: STO (Safe torque off) X15: Transmission STO (Safe torque off)
Connection design	Connector with spring connection SPT 5/ 4-H-5,0
Operating tool	Slot screwdriver (size: 0.6 x 3.5 mm)
Poles	2
Electrical data	Siehe 'Technical data'.
Cable	2-wire, unshielded
Recommended cable cross section	0.75 mm² AWG 18
Cross section min./max.	0.25 mm² - 1.5 mm² AWG 22 - AWG 16
stripping length	15 mm
Maximal cable length	30 m
cable assembly	Wire end ferrule with plastic sheath
Notes	STO (safe torque off) is a safety function according to DIN EN 61800-5-2 and corresponds to an uncontrolled stopping according to EN 60204-1, stop category 0. For applications with the STO safety function (PL d according to EN 13849-1, SIL2 according to EN 61508), the logic and STO must be supplied with PELV power supplies: PELV power supply (Protective Extra Low Voltage): functional extra-low voltage with safe separation The voltage must also be limited to a maximum of 60 VDC in the event of an error. The 0 VDC potential of the power pack must be grounded at the central PE.