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• Circuit Status
The gates monitored by the SensaGuard interlock switches are closed.
The guard locking switches are closed and locked. The DG and EM
safety relays are OFF and ready for reset.
• Starting
Press the Reset button to energize the DG and EM safety relays. Their
output contacts close. Press the Start button to start the motor via
contactors K1 and K2 and energize the two immediate acting loads.
• Stopping
Press the Stop button to turn the motor and immediate acting loads off.
The immediate acting loads and contactors K1 and K2 de-energize
immediately, and the motor coasts to a stop. This action does not unlock
the guard locking switches.
IMPORTANT The Start/Stop circuit can be replaced by an equivalent machine
• SensaGuard Switches
Opening either SensaGuard interlock turns off the DG and EM safety
relays. The EM safety relay turns off K1 and K2 immediately, and the
motor coasts to a stop. With the Time switch on the DG safety relay set
to 9, the 13/14 and 23/24 outputs on the DG safety relay turn off after
5 seconds. This action does not unlock the guard locking switches.
• Unlock the Guard Locking Switches
Use the HMI to unlock the guard locking switches. The EM safety relay
turns off K1 and K2 immediately, and the motor coasts to a stop. After
5 seconds, both the 13/14 and 23/24 outputs of the DG safety relay
turn off the immediate acting loads and the guard locking switches are
unlocked.
IMPORTANT The outputs of the DG safety relay (13/14 and 23/24) turn off and
• Restart
Close the safety gates. If the gates were unlocked, use the HMI to
initiate a lock command. Both gates are locked and the GuardLink
circuit is satisfied. Press the Reset button. Press the Start button to
energize the immediate acting loads and turn on the motor.
Rockwell Automation Publication 440R-UM015C-EN-P - April 2018
controlled system to start or restart the hazards after the safety
system is reset.
the unlock command occurs after the time delay expires. The
immediate acting loads must remove the hazards they control
quickly before you can open the gate and reach the hazard.
Overview
Chapter 1
21
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