Elevator Recall Relays Wiring

designer82

Senior Member
Location
Boston
Regarding elevator recall relays...
how does either the Primary or Alternate relay know to trip (and not both at same time) from just the SLC wiring (shown to the right of them)?


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Is it such that the SLC circuit has both input and output capability?
So if a smoke detector triggers, it doesn't send its signal throughout all SLC devices, it just sends it to Control Panel, then in turn Control Panel sends an output signal just to designated device address? (as in via magic)?
 
The panel is going to have functions that assign inputs and outputs. So function F1 for primary recall, will have all the elevator lobby smoke detectors EXCEPT for the primary floor elevator lobby detector, the machine room smoke detectors, and the hoistway smoke detectors, if any, assigned to the input of F1. Usually, they are placed in a zone and the zone becomes the input to the function. The output of the function is assigned to the address of the FRM-1 relay module. Easy peasey.
 
Is it such that the SLC circuit has both input and output capability?
So if a smoke detector triggers, it doesn't send its signal throughout all SLC devices, it just sends it to Control Panel, then in turn Control Panel sends an output signal just to designated device address? (as in via magic)?
Yes, that is correct. When you start getting in to complex fire alarm systems, there are tons of things that only trigger certain actions.
 
The information you have been given is correct. You may already know this: The Fire Marshall designates what they call the “ Egress Floor “.
This is the floor that the elevator goes to when there is a fire alarm activates. It is the floor deemed most escapable in an emergency. In almost all cases it is the ground floor. If the fire alarm goes off at the egress floor the elevator goes to an alternate floor designated by the Fire Alarm Control Panel. There are two Fireman Switches. One at the egress floor, outside the elevator on or near the hall cutoff switches ( elevator buttons ). Key activated ( Fire Service Key ). When this switch is activated the elevator comes directly to he egress floor. No button inside or outside the elevator functions. The second Fireman’s Switch is inside the elevator, usually behind a locked panel, that is opened with the same Fireman’s Service Key.
This switch, when activated, allows a fireman to manually control the elevator. Close the door, chose a floor and manually open and close the door. The Texas State Elevator Inspector I worked with not only wanted the doors to open and close manually, he want the doors to be able to be bumped slighly open and closed quickly in case of a danger on the other side of the door.
 
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