Rockwell Automation 21G PowerFlex 750-Series AC Drives Reference Manual - Manual (Page 72)

72 Rockwell Automation Publication 750-RM001F-EN-P - February 2012
Chapter 6 Safe Stop and Safe Stop with Door Monitoring Modes
Safe Stop with Door
Monitoring Mode When properly configured for Safe Stop with Door Monitoring, the safety
option monitors the Safe Stop input (SS_In) and initiates the configured Safe
Stop Type upon deactivation of the input as described in
Safe Stop Mode on
page 61 .
In addition, the safety option verifies through monitoring the Door Monitor
input (DM_In) that the door interlock solenoid controlled by the Door Control
output (DC_Out) is in an expected state. The DM_In input is ON when the
door is closed and OFF when the door is open. If the door is monitored as
opened during Safe Stop monitoring, a Door Monitoring fault occurs and the
safety option initiates the configured Safe Stop Type.
You can monitor the door’s status with or without using the Door Control (lock/
unlock) function. When door control logic is set to Lock, the safety option puts
the solenoid into the locked state when the machine is not at a safe speed or at
Standstill Speed.
Lock Monitoring
If a Safety mode that includes Door Monitoring is selected and Lock Monitoring
is enabled, the Lock Monitor input (LM_In) signal must be OFF any time that
the Door Monitor input (DM_In) transitions from ON to OFF.
SS Reset
If the Door Monitor input (DM_In) is OFF when a Safe Stop (SS) Reset is
attempted in any state other than actively monitoring Safe Limited Speed, a Door
Monitoring fault occurs and the safety option initiates the configured Safe Stop
Type.
IMPORTANT If your application uses Lock Monitoring without Door Monitoring, you must
use some means to make sure that the Lock Monitor is not stuck at Lock
indication.