Maxon EPOS4 50/5 - STO (Safe Torque Off) Function (X9)

Setup
Connections
EPOS4 50/5 Hardware Reference
CCMC | 2023-07 | rel11726
3-45
3.3.9 STO (X9)
The STO (Safe Torque Off) function can be utilized to bring the drive to a torque-free, safe condition via two
independent inputs. The drive output power stage is switched off if either one of the inputs is not powered.
For in-depth details on the STO functionality see separate document «EPOS4 Application Notes».
Non-certified STO functionality
The implemented STO functionality will not be certified.
Figure 3-35 STO connector X9
Activation of power stage
In order to activate the power stage, either both STO inputs must be powered or the «STO Idle Connector»
(  Table 3-47) must be plugged.
Table 3-46 STO connector X9 – Pin assignment
For the matching prefab cable assembly Table 3-36 on page 3-39.
Table 3-47 STO Idle Connector
Continued on next page.
X9
Head A
Prefab
Cable
Head B
Signal Description
Pin Color Pin
1 white 1 STO-IN1+ Safe Torque Off input 1, positive signal
2 brown 2 STO-IN1− Safe Torque Off input 1, negative signal
3 green 3 STO-IN2+ Safe Torque Off input 2, positive signal
4 yellow 4 STO-IN2− Safe Torque Off input 2, negative signal
5 grey 5 STO-OUT+ Safe Torque Off output, positive signal
6 pink 6 STO-OUT− Safe Torque Off output, negative signal
7 blue 7 GND Ground
8 red 8
V
STO
Activation voltage for STO inputs (+5 VDC)
Note: Do not use this voltage for any other purpose
STO Idle Connector (520860)
—included with every delivery—
Plug Molex CLIK-Mate, single row, 8 poles (502578-0800) with cable bridges