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When only an electromagnetic lock is used for locking
and releasing the door, there cannot be a mechanical
latching device, such as a mortise or cylindrical lockset,
attached to the door.
opening of the door. The opening must be equipped
with push-pull hardware trim only.
The most common type of fail secure locking device used is the
electric door strike. A complete riser diagram and point-to-point
wiring diagram depicting an application utilizing this type of
locking device can be found at the end of this manual, shown as
figures 2a and 2b respectively. A latching type of fail secure
electrified locking device can be used providing that it is
designed to have its latch retracted in less than 1 second upon
application of power when the cycle has been activated, and
providing the solenoid or motor used in the device does not
draw more than 1 amp at 24VDC.
Both a fail safe and fail secure electrified locking device can be
used on the same door, if desired. As an example, a single door
may contain a fail safe electromagnetic lock on the door frame
header and a rim exit device with fail secure electric latch
retraction on the door. When the system is activated, power is
removed from the electromagnetic lock at the same time power
is applied to the rim exit device (for retracting its latch) prior to
signaling the automatic door operator to open. Each of these
devices can separately draw up to 1 amp of current since, at no
one time are both devices drawing current simultaneously.
CAUTION:
Do not use the Hager 4500 ELR, Von Duprin
Series EL, or any other manufacturer of electric latch retraction
exit devices with the 2904 power supply.
generate an initial high current pulse in excess of 8 amps. The
2904 power supply is not designed to handle that amount of
current draw. Special power supplies, specifically designed for
use with these type of exit devices, are available by contacting
the manufacturer. Before using any exit device modified for
electric latch retraction, make sure to check out its electrical
specifications for ratings, and ensure that the manufacturer of
the device does not require it to be used with a special power
supply offered by that manufacturer.
Automatic Door Operator
The output terminals marked ADO at terminal block TB1 provide
the electrical signal to the input of the automatic door operator
for activating its "door open" cycle. This electrical signal is in the
form of dry contacts from a relay located on the same p.c. board
as TB1.
The ADO output can be programmed for either a
normally open or a normally closed contact signal.
automatic door operator units accept a normally open contact
signal, and the onboard dip switch bank is factory set for a
"N.O." output. But in the event that a normally closed (N.C.)
signal should ever be required for activating an automatic door
operator directly or indirectly, reconfigure the dip switch bank
#2 and #3 switches per the illustration in the next column:
REV 2
INSTALLATION INSTRUCTIONS (cont)
This would prevent automatic
These devices
The dot shown above marks the position of the switch.
Emergency Release Switch
The emergency release switch input, marked as ERS at terminal
block TB1, accepts a normally closed switch (or normally closed
relay contacts) that is associated with some form of emergency,
such as a panic alarm, or fire alarm. When the switch contacts
open during an emergency situation, the electric locking device,
regardless if it is fail safe or fail secure function, will unlock the
door for immediate access. The 2904 comes from the factory
with the emergency release switch input disabled. To enable the
ERS input, switch #4 from the onboard dip switch bank must be
placed opposite the "ON" position, as shown below:
The dot shown above marks the position of the switch.
Auxiliary 24VDC Output
This output, marked as 24V at terminal block TB1, provides a
constant 24 volts that can be used to power keypads, motion
detectors, LED or incandescent status indicators, etc.
maximum load of 1 amp is allowed across this output.
Most
27390037
2904 Power Supply
Installation Instructions
I-EA00041
A
Page 3 of 6
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