GENERAL INFORMATION
Functional Detail
The DORMA ED 800 low energy power operator was designed
to make doors accessible, while still providing the good
operating characteristics of a manual door closer.
The ED 800 is based on the DORMA TS83 door closer and
offers the same sweep, latch, backcheck, adjustable spring
power and operating efficiencies. In the normal mode of
operation, the ED 800 will be used as a manual door closer.
Upon activation the unit will open the door, hold the door open
for a predetermined period, and close the door under the
parameters as set forth by ANSI A156.19, Standard for
Power Assist and Low Energy Power Operated Doors.
The mechanical components of the unit consist of a
permanent magnet type DC motor, which drives a lead screw
assembly. The lead screw assembly has a recirculating ball
nut with a shuttle attached to it. The shuttle drives the TS83
door closer.
The electronic components of the unit consist of the motor,
an encoder assembly, a control module, a power transformer,
and additional electronic components and assemblies. The
transformer is powered by line voltage. The transformer
powers the control module. The motor is driven by the
control module. The motor shaft turns an incremental
encoder which indicates the motor velocity to the control
module. The control module responds to external inputs such
as an activation switch and internal door inputs such as an
obstacle encountered in the opening or closing cycle.
The unit also provides a manual rocker switch for a hold
open function. The hold open switch will override all other
inputs, and will hold the door open approximately 5 minutes.
After that period of time, the door will automatically close and
return to the automatic mode. The door can also be closed at
any time by pushing the hold open rocker switch in the
opposite direction.
The ED 800 has two basic functions which can be selected in
the field: Low Energy or Power Assist. The factory setting will
be at Low Energy. In the Low Energy function, when the
door is activated, the door will open within the speed and
force guidelines, per ANSI A156.19. The door will open to a
position which is adjustable between 85° and 115°, and will
stay in the hold open position for a period of time which is
adjustable from 5 to 60 seconds. At the expiration of the
selected time, the door will begin to close. The time delay
commences once the door attains the fully open position, or
when it last receives an actuation input, whichever occurs
later.
In the opening cycle the door will exert a maximum of 15 lbf.
at the latch edge of the door. In the event an obstacle is
encountered, the power will be reduced to the door, so that
the door is held in a balanced state.
While in the balanced state the door can easily be pushed open
or closed, as needed. The door will remain in the balanced state
for the length of time as set by the time delay adjustment. The
time delay commences once there is no longer any door
movement.
In the closing cycle a maximum of 15 lbf. may be generated at
the latch edge of the door. If an obstacle is encountered, the
unit will balance the door. While in this state the door can easily
be pushed open or closed manually, as needed. The door will
remain in the balanced state for the length of time as set by the
time delay adjustment. The time delay commences once there is
no longer any door movement.
If at any time there is a power failure, the unit will operate as a
standard TS83 door closer.
The second basic function is power assist. When the power
assist is activated, the unit responds by opening the door
approximately one inch, to alert the user that the power assist
mode is active. The door can then be opened with a reduced
opening force, which can be adjusted from 1/2 lb. to 5 lbs., as
measured from the latch edge of the door. The reduction of
opening force remains active as long as the unit senses door
movement, plus the duration of the time delay setting. The time
delay will commence after there is no door movement. At the
expiration of the time delay, the door begins to close under the
control of the TS83 door closer.
When the ED 800 is initially energized, it will perform a learn
cycle. If the door is latched and can not open during the learn
cycle, the ED 800 will default to the power requirements of a
typical 36" wide interior door. If an electric strike, magnetic lock
or electric latch retraction device is installed and tied in with the
delay contacts, the ED800 will automatically send a signal to
unlock the strike, magnetic lock or hold back the electric latch.
The ED800 will only go through a full learn cycle when turned on
at the ON/OFF switch. During the learn cycle, the exact closed
position of the door will be established. Also, the ED800 will
open the door a few degrees to determine the amount of force
required to compress the door closer spring and set the door in
motion. From this information, along with the "door width"
setting, the control module can determine the amount of force to
exert on the door so as not to exceed the 15 lbf. maximum
required by the ANSI 156.19 standard. If the ED800 losses
power, (other than the ON/OFF switch) when power is restored
the ED800 does a Secure Learn. The most recent learn cycle is
stored in memory and is used so that the door stays secure
(locked and latched) during and after a power failure.
Activation of the ED 800 can be by any normally open circuit
which is momentarily closed to signal the door. The most basic
means of activating the unit would be a wall switch or frame
switch which is directly wired to the external connector. A radio
frequency receiver along with a radio frequency wall switch
transmitter, or hand held transmitter, can be used if it is
considered too difficult to run wires from the push button to the
unit. For doors that are specifically dedicated for accessibility, a
motion sensor is available to activate the unit. Keep in mind that
when the unit is not activated it will operate as a standard TS83
door closer.
ED800-4
08102710 05/07
Summary of Contents for ED800 J
Page 26: ......
