Assa ELECTRIC LOCK manual Emergency Release Wiring Option PB

Rev. A.1, 10/99 Page- 18

The silence latch is entirely prewired. However, if the panel that has been supplied was ordered without a silence latch, one can be added comparatively easily in the field. The components required are an SPDT relay of the panel voltage and an illuminated normally open momentary switch with an indicator that also operates on the panel voltage.

Figure 7 shows the circuit. The prewired connection between the Sonalert + input and one of the A terminals is broken with the components wired in as shown in the drawing. In a violation event, +V appears on terminal A. This operates the Sonalert through the COM and NC relay terminals. When the push button is pressed, it energizes the relay which latches in through its NO contact. This shuts off the Sonalert and illuminates the push button indicator. When the violation is cleared, +V is removed from terminal A and the silence latch resets, ready for the next violation event.

5.2 EMERGENCY RELEASE WIRING (OPTION "PB")

The PB option is factory supplied for use only with fail safe locks. Normally fail secure locks are not used in a safety type situation where emergency release is desired. The only wiring change from a standard panel is that the negative terminals of all the boards “-” are already wired to the push button. A single black flying lead emerges from the push button and DC negative external power of sufficient capacity to operate the entire system should be connected to this black wire. When the button is pressed, all DC power will be broken which will immediately release all the locks. Make sure you terminate the lock negative wires at the panel “-”terminals rather than directly back to the power supply or the push button break will not work. At the same time, the button will illuminate red. Pressing the button a second time will restore power.

The reason that the PB option is set up to break the negative circuit instead of the positive is to preserve the ability to run separate +V inputs to each board zone. This can allow separately breakered inputs from a Securitron power supply or the installation of upstream switches.

If the present panel has been supplied without this options, it may be added in the field. Follow the connections shown in Figure 8. Be sure to select a button with heavy enough contacts to break all the DC power.

FIG. 8: FIELD INSTALLATION OF EMERGENCY RELEASE BUTTON

CONSTANT +V

L+=INDICATOR +		L-	L+
L-=INDICATOR -	NO
DC NEG FROM	COM		NC
POWER SUPPLY

ALTERNATE ACTION

ILLUMINATED PUSH BUTTON

BUTTON NC CONNECTS TO "-" TERMINALS

ON ALL BOARDS IN PANEL

MAKE SURE EQUIPMENT AT DOORS TERMINATES ITS NEGATIVES AT PANEL "-" TERMINALS

5.3 WIRING OF "AM" OPTION AND SECURITRON'S XDT BOARD FOR DELAYED EXIT

One of the most common uses of the AM option (extra monitoring lights with pulsing Sonalert) is for an exit delay installation (allowable only for fail safe locks). Such an installation complies with the NFPA Life Safety code as regards delayed exit (special locking arrangements) and typically incorporates multiple functions: