10 Rockwell Automation Publication SAFETY-AT140A-EN-P - May 2015
Safety Function: Actuator Subsystems – Stop Category 1 via the PowerFlex 525 and PowerFlex 527 Drives with Safe Torque-off
This document presumes that a Stop/Start button is connected to the system PAC. It is referred to in Figure 2, but is not
part of this circuit. This button is used for normal, non-safety stops and starts of the system. It is also used to start/restart
the drive after safety-related stops once the safety circuit is reset.
Figure 2 - PowerFlex 527 Circuit
24V DC
0V DC - COM
Typical Safety Input Device
24V DC
0V DC
To PAC
Digital Common
Gate control
power supply
Gate control
circuit
Initiate Configured ‘Normal’
Production Stop.
Start/Stop requests provided to
the drive by PAC via Ethernet.
Actuator
Logic
Range
Time
**100 ms OFF Delay
.
PowerFlex
527
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