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“ what is fail safe? ”

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Answer
FAIL SAFE
FS, EL, Electrically Locked
What is the part number for the Fail Safe slider for the 6211?
The sliders are different between the 6211 and 6211WF.   The FS slider part number for the 6211 is 090591 The  6211WF FS slider is 090798.
Why is my Von Duprin M996L lever trim not operating in its configured Fail Safe or Fail Secure mode?
Please reference your M996 instructions along with this article.   Instructions can be searched by clicking HERE.    Locate the  small DIP switch near the motor a...
What is the part number for the ND solenoid?
The new motor driven ND electrified locks shipped after March 14, 2016 do not require a solenoid. The Schlage ND-Series electrified locks shipped prior to March 14, 2016 would have used a...
Can I convert an L9000 electrified lock to fail safe or fail secure?
Procedure for the L9090EL/EU, L9091EL/EU, L9092EL/EU, L9093EL/EU, L9094EL/EU, L9095EL/EUThese devices have a selectable switch in the upper right corner of chassis.  Simply move the switch to ...
Procedure for the L9080EL/EU and L9082EL/EUTo modify an electrified L9000 from EU to EL or EL to EU move the link pin to the appropriate location indicated below in Figure 1.  
Can the state of the E360L be changed in the field?
To convert the E360L electric trim from fail safe to fail secure or vice versa you need to replace the solenoid.  The 050743 is the fail secure and 050744 is the fail safe solenoid kit. ...