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Frequently
Asked Questions - Sensing Edges
Q. What is a Miller Sensing Edge?
A. Miller Edge sensing edges are designed to an obstruction in a
door or gate opening. Activation of the sensing edge will cause
the motor operator to stop a closing door, or stop and open a closing
door, or prevent an open door from closing, depending on how the
motor circuit is wired.
Q. What is a Miller 2-Wire Electric Sensing Edge?
A. A Miller 2-wire electric sensing edge consists of two (2) adjacent
conductive strips inside an astragal that is attached on the bottom
of a motor driven door. These strips are normally separated by a
small gap, and are connected to the control circuit of the motor
operator. When the astragal is compressed, the conductive strips
make contact activating the sensing edge. In the event that the
conductive strip(s) become broken, the section of the sensing edge
beyond the break will cease to function.
Q. What is a Miller 4-Wire Sensing Edge?
A. Also known as a "Fail-Safe" edge, with the term fail-safe
designating that the door will revert to manual operation in the
event of a continuity loss within the circuit. The four-wire electric
sensing edge operates the same as a two-wire electric sensing edge
with the exception that it is designed to function with self-monitoring
circuitry. This circuitry will prevent the motor operator from closing
the door when a fault is detected, e.g. a conducting strip is broken
or a wire is open, requiring manual operation to close the door.
Q. What is a Miller Pneumatic Sensing Edge?
A. A Miller Pneumatic Sensing Edge is a flexible astragal or weather
seal attached to the bottom of the door with a rubber or plastic
tube inside the full length of the astragal. A plug seals one end
of the tube and the other end is attached to a pneumatically activated
electric switch that is connected to the control; circuit of the
motor operator for the door. When the door closes on an obstruction,
the pressure in the tube increases and activates the electric switch.
Q. What is a Miller "Patriot" Non-Contact Sensing Edge?
A. The Patriot Series of sensing edges consists of a Control Unit,
and Emitter Eye and a Receiver Eye. The eyes easily mount into your
choice of "Z-Flap" or "Telescopic" mounting
brackets, which extend below and travels with the leading edge of
the door. The eyes provide an invisible beam of protection along
the edge of the door. Once the beam becomes blocked by an obstruction
or person, it sends a signal to the Control Unit, which in turn
sends a signal to the door operator to stop and/ or reverse its
motion.
Q. When ordering how do I measure the length of a Miller Edge.
A. For Sectional Doors, use the section width. For Rolling Steel
doors, take the measurement from tip of the guide to tip of the
guide, and deduct 2 inches.
Q. What color options are available when ordering a Miller Sensing
Edge?
A. For Sectional Doors and Gates, black is the standard color. Yellow
is an option on some models. For Rolling Steel sensing edges, gray
is the standard color. Optional colors for Rolling Doors include
yellow, black, white and yellow/black striping. Other colors are
available upon request.
Q. How do
I convert a 4-Wire Edge into a 2-Wire Edge?
A. To convert a four-wire edge into a two-wire edge, twist the two
black wires together and then twist the two white wires together.
Q. Can a Miller Edge be cut down in the field?
A. NO! A Miller Sensing Edge is hermetically sealed in our factory
to ensure a weatherproof product. If an edge is too long for your
application, please contact one of our factories to have the edge
cut down, or to have a replacement issued.
Q. What do I do if I have a defective edge?
A. Please contact one of our factories for a Return Authorization
Number.
NO shipment will be accepted without prior authorization.
Q. Where may I purchase a Miller Sensing Edge?
A. We have distributors located throughout the United States and
Canada. Our products are also available overseas. Please contact
our factory for additional information.
Q. Can an electric edge be made Normally Closed instead of Normally
Open?
A. No, BUT you can still use an electric edge.
Q My operator DOES NOT HAVE B-2 WIRING, can I still use an electric
edge?
A. Yes, you can still use an electric edge.
Explanation:
Our edges are considered normally open. When wired to operators
with B-2 wiring, you simply attach the leads
to the reversing terminals in the operator. The general idea is
that when the edge is activated during the door's downward motion,
the edge signals the motor to stop and reverse.
If the operator does not have B -2 wiring, you will have to add
this capability to the operator. To make the edge function as a
normally closed contact: during the downward cycle, you want to
de-energize the current to the closing coil of the contactor and
energize the opening coil of the contactor. You will definitely
need a relay and may or may not need a transformer.
You will need to answer a few questions before proceeding:
1. Is there
a cutout limit switch on the operator? If Yes, GO TO I
If there is not a cut out limit switch on the operator,
2. Is there existing 24 volt control wiring? If YES, GO TO II
3. If there is no cutout limit switch and no 24 volt control wiring,
GO TO STEP III
I. The operator DOES HAVE a cutout limit switch
A. Does the
operator allow for access to 24 volts for control wiring?
1. If 24 v is not available, you will need to purchase a step down
transformer,
2. Disconnect power to the door operator.
3. Connect high voltage leads to the line voltage
4. If 24v is available, you will not need to purchase a transformer.
We have several
relay and transformer assemblies available to reduce voltage from
110v (RTA-110), 220v (RTA-220), and even 550v (RTA-550), down to
24 volts. You should never apply more than 24v to the edge
sensor.
B. You will
now series connect the coil of the relay (R-01) to the edge, cutout
limit switch and transformer.
1. Connect the transformer's 1st low voltage (24v) lead wire to
terminal-A on the relay (R-01)
2. Connect the white lead wire on the edge sensor to terminal B
on the relay (R-01)
3. Connect the black lead wire on the edge sensor to one terminal
of N.C. cut out limit switch
4. Connect empty contact on cut out limit switch to the 2nd lead
wire on the transformer
C. You will
now connect the relay to the door operator.
The N.C. contacts on the relay are 3 and 9, The N.O. contacts on
the relay are 4 and 7
1. Disconnect wire from the close button that connects to terminal
strip on door operator
2. Connect this wire from the close button to terminal 3 of relay
3. Connect terminal 9 of relay to the close button
[You may also
series connect the N.C. contacts (3 & 9) with the closing coil
of the contactor]
D. Parallel
connect the N.O. contacts on the relay (4 & 7) to the open push
button
1. Connect one N.O. contact (7) of the relay to one terminal of
the N.O. push button
2. Connect the other N.O. contact (4) of the relay to the other
side of the open push button
E. GO TO
STEP IV
II. The operator does NOT HAVE a cutout limit switch but DOES HAVE
existing 24v control wiring. You will need to purchase a relay only
(P/N R-01)
A. Disconnect
power to door operator
1. Connect the terminal A on the relay (R-01) to the common lead
on the existing 24v transformer
2. Connect terminal B on the relay (R-01) to the white lead wire
of the edge sensor.
3. Connect the black lead wire of the edge sensor to the point where
power is lost when down limit is activated (this is located in different
locations depending upon the operator brand)
B. You will
now connect the relay to the door operator
The N.C. contacts on the relay are 3 and 9. The N.O. contacts on
the relay are 4 and 7
A. Disconnect wire from the close button that connects to terminal
strip on door operator
B. Connect this wire from the close button to terminal 3 of relay
C. Connect terminal 9 of relay to the close button (You may also
series connect the N.C. contacts (3 &9) with the closing coil
of the contactor)
C. Parallel
connect the N.O. contacts on the relay (4 &7) to the open push
button
1. Connect one N.O. contact (7) of the relay to one terminal of
the N.O. push button
2. Connect the other N.O. contact (4) of the relay to the other
side of the open push button
D. GO TO
STEP IV
III. The operator does NOT HAVE a cutout limit switch, does NOT
HAVE existing 24 volt control wiring. You will need to purchase
a relay and a step down transformer to step voltage from control
voltage down to 24 volts. We have several relay and transformer
assemblies available to reduce voltage from 11Ov (RTA- 110), 220v
(RTA-220), and even 550v (RTA-550), down to 24 volts. You should
never apply more than 24v to the edge sensor.
A. Take one high voltage lead from the step down transformer and
connect to common lead of the control voltage.
B. Take the other high voltage lead from the step down transformer
and connect to the point where the power is lost when the down limit
switch is activated. (this is located in different locations depending
upon the operator brand)
C. Connect one low voltage (24v) lead wire from the step-down transformer
to terminal A of the relay. Connect the white lead wire on the edge
sensor to terminal B of the relay. Connect the black lead wire on
the edge sensor to the other low voltage (24v) lead wire of the
step-down transformer.
D. You will
now connect the relay to the door operator. The N.C. contacts on
the relay are 3 and 9. The N.O. contacts on the relay are 4 and
7
1. Disconnect wire from the close button that connects to terminal
strip on door operator
2. Connect this wire from the close button to terminal 3 of relay
3. Connect terminal 9 of relay to the close button
[You may also
series connect the N.C. contacts (3 & 9) with the closing coil
of the contactor]
E. Connect N.O. contacts of relay (4 & 7) in parallel to open
push button.
1. Connect the N.O. contact (7) of the relay to one terminal of
the open push button.
2. Connect the other N.O. connect (4) of the relay to the other
side of the open push button.
F. GO TO
STEP IV
IV. Adjust the down limit so that the door stops approximately I
to 2 inches above the floor and edge sensor rests on the surface
of the floor. If the downward limit is set too far down, the edge
sensor will not cut out of the circuit and will reverse when it
hits the floor. Test for security. With the door in its fully closed
position, reach your hand under the sensor and press. The edge should
not activate when the door is fully closed - if it does activate,
re-adjust the operator's down limit switch to avoid a breach of
security.
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PRO
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