Assa ELECTRIC LOCK manual Fail Safe Locks, Type 1 Fail Safe, Type 2 Fail Safe

controlled by the panel zone. Not also that Securitron can supply additional breakered output boards for the power supply (part #CCB-8).

If the “PB” option is supplied, (see Sections 2.2 and 5.2) power supply DC neg does not connect to the “-” terminals on the boards but rather to a flying black lead coming from the push button switch. Note that the board “-” terminals will all be pre-wired to the button when this option is present. Pressing the button breaks DC negative which releases all fail safe locks. The button does not break +V so as to preserve the capability of multiple breakered inputs.

Finally, note that for a standard board, the 12 position terminal strip that includes the four “+” terminals and "-" requires field wiring to only these terminals. The other terminals on the strip are either prewired (R and A) or used only if options are supplied (see section 5 for option wiring). All the rest of the field wiring is on the second 12 position terminal strip that includes the S, L, and E terminals for zones 1 through 4. If the panel has been delivered in a wall mount NEMA 1 cabinet, the installer does not wire directly to the boards but rather to a channel mount terminal strip in the base of the enclosure. The terminal identification, however, is the same.

4.2 FAIL SAFE LOCKS

Figure 3 shows 5 different ways of wiring fail safe locks to the panel board. The exact wiring done will depend upon the equipment utilized and the requirements of the job. All panel to lock wiring concerns only 3 panel terminals: S, L and E for the respective zone (4 zones per board). Check the description of each wiring method to see which (if any) applies to your installation. Later in the manual, other typical wiring schemes will be shown.

TYPE 1 FAIL SAFE

The type 1 drawing is the simplest. It utilizes a fail safe lock controlled directly by the panel with no other release devices employed. No lock or door status monitoring switch is used.

As the drawing shows, lock power comes from the L terminal and the S terminal is connected to the power wire at the lock. With this connection, when the lock is powered, the S terminal will receive +V which will illuminate the green side of the bicolor LED. When the lock is released from the panel toggle, the bicolor will be off and the toggle bat yellow LED will come on. Since the door is not monitored, the red violation LED should never come on and sound the Sonalert. An exception would be if the power wire to the lock was cut so that +V could not reach the S terminal when the lock is powered.

TYPE 2 FAIL SAFE

This connection employs a lock or door status switch which is closed when the lock or door is secure. Lock status provides superior security as the door can be closed but the lock may not be fully secure. The status switch connects to the S terminal and therefore illuminates the green side of the bicolor when the door is secure. When the lock is released from the toggle, power is removed from the status switch so the green indicator goes out and the yellow toggle bat indicator comes on. If, however, the status switch opens (because the lock becomes insecure or the door is open) at a time when the lock is powered, this is the violation condition and after a 2 second delay, the bicolor will turn red and the Sonalert will sound. After the door has been resecured, the bicolor will show orange as both the red and green sides will be on. The panel is then reset by momentarily pressing the reset toggle. This will extinguish the Sonalert and restore green condition on the indicator.

On some installations, both a lock and door status switch may be employed. They should be connected in series so that the lock must be reporting secure and the door must be closed before the green indicator will come on. In theory the lock status switch cannot report secure if the door is open. However, combining the 2 switches enhances security in case the lock status switch fails or is tampered with.