Yale 781n User manual

781N Electric Latch Pullback Controller

Installation Instructions

INSTALLATION

For C-UL Listed applications, the unit shall be installed in accordance with Part 1 of the

Canadian Electrical Code. Transformer model BE31763001 by Basler Electric and transformer

model 2010028 by Galaxy Transformer and Magnetics have been certified for UL and C-UL

applications. Transformer model A41-130-28A34 by EWC has been certified for UL applications

only.

The 781N enclosure should be securely fastened to the wall using the four 1/4 inch diameter

mounting holes located in the back of the box. Position the enclosure so that the transformer is

located on the left-hand side. The 781N must not be installed outdoors.

For the 120VAC power input, terminal block TB1 will accommodate up to 12 AWG wire (solid).

Conduit must be used to provide an adequate earth ground to the enclosure.

NOTE: The maximum input current is 750mA.

The 781N is designed to be used with electric latch pullback exit devices. Use the chart below to

determine the correct wire gauge per given length of two-conductor cable that will be run from

the 781N to each exit device. Do not exceed the maximum length listed with each wire gauge.

WIRE GAUGE MAXIMUM LENGTH OF TWO-CONDUCTOR CABLE

16 AWG 40 FEET

14 AWG 60 FEET

12 AWG 100 FEET

Up to two devices can be used with the 781N. If only one device is to be used, wire to the

"DEVICE ONE" location at TB3, terminals 5 and 6.

NOTE: Be sure to observe polarity when connecting devices 1 and 2 to TB3.

(Refer to the wiring diagram located on the lid of the controller.)

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80-9477-0781-010 (01-13)

STANDARD OPERATION

The 781N provides a choice of two methods of electric latch pullback: Single System or Dual

System

SINGLE SYSTEM LATCH PULLBACK

This method allows one input to control two devices sequentially. A momentary switch closure

across terminals 1 and 2 of TB3 will pull back DEVICE ONE first, followed by DEVICE TWO. Use

this method for single door applications or on a pair of doors using a device on one or both leaves.

The 781N comes from the factory already set up for this method.

DUAL SYSTEM LATCH PULLBACK (OPTIONAL)

This method allows independent control of DEVICE ONE and DEVICE TWO outputs by their own

separate input. A momentary switch closure across terminals 1 and 2 of TB3 will pull back DEVICE

ONE only. A momentary switch closure across terminals 7 and 8 of TB3 will pull back DEVICE

TWO. No more than one device can be used per output. Use this option for applications requiring

two single door systems or two pair door systems using one device on the active leaf of each pair of

doors. To change over to the optional dual system latch pullback, move the program jumper PJ1

from between the middle post and the end post, marked "S" (Single System) to between the middle

post and the end post, marked "D" (Dual System).

NOTE: When using the optional method, DEVICE ONE and DEVICE TWO can never be activated

at the same time in the event that both input switches are actuated simultaneously. If this

should occur, DEVICE ONE will always activate first, followed by DEVICE TWO.

When using a momentary, normally open switch for activating latch pullback, adjust pot R2 (for

DEVICE ONE) or pot R4 (for DEVICE TWO) on the p.c. board to the desired latch pullback delay

time from 1 to 20 seconds. Turn the pot clockwise to increase the delay time.

When using normally open contacts from a keypad or card reader ( with built-in time delay) or a

maintain switch, turn pot R2 (or R4) fully counterclockwise to the minimum delay time (approx. 0.5

sec.). A contact closure will activate latch pullback. Upon opening of the timed or maintained

contacts, the device will latch within 0.5 second.

Each modified exit device contains a pulse module which delivers a pulse at approx. 24VDC to a

high current coil inside the exit device every 6 seconds until the latch is finally pulled back all the

way. At this point, a control rod passes over a reflective sensor and signals the module to stop

pulsing. There is always an initial pulse that occurs at the moment the system is activated. During

the period the system remains activated, output voltage is applied to a low current secondary coil.

This coil is responsible for holding the latch in the "pulled back" position until instructed to return to

the "fail secure" position. (See note 2 on page 5.)

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80-9477-0781-010 (01-13)

OPERATION WITH AUTOMATIC DOOR OPERATOR

The 781N is provided with two outputs (one output associated with DEVICE ONE and the other

output associated with DEVICE TWO) for controlling separate automatic door operators. Each

output consists of normally open relay contacts that are field wired directly to the "DOOR

ACTIVATION" input of the automatic door operator. These outputs are activated within a moment

after activation of their corresponding devices to allow time for the doors to be fully unlatched before

automatic opening begins.

Time delay pots R2 and R4 are factory set at 5 seconds, which are appropriate when using this

controller with automatic door operators. When the delay times out, power is removed from the exit

device and the signal to the auto door operator input is terminated, thus allowing the operator's

"DOOR HOLD OPEN" delay to time out and close the door.

NOTE: When using the single system latch pullback method with automatic door operator interface

and both devices are being used, the operator control input must be wired to the 781N

automatic door operator output for DEVICE TWO (TB3, terminals 9 and 10).

OPERATION WITH FIRE ALARM

The 781N can be wired to the fire alarm relay normally closed contacts. When a fire alarm occurs,

any door that is currently unlatched, whether by momentary time delay or by maintained switch, will

immediately latch secure. During the time that the fire alarm is active, electronic control of the

automatic door opening system by wall switch, card reader, keypad, etc., is disabled. The door then

can only be opened manually.

The 781N comes from the factory set up for use without fire alarm interface. If the fire alarm is to be

used with this controller, move the program jumper PJ2 from between the middle post and the end

post, marked "FA DIS" (Fire Alarm Disabled), to between the middle post and the end post, marked

"FA EN" (Fire Alarm Enabled).

NOTE: The current drawn through fire alarm relay contacts will be 120mA @ 24VDC

AUXILIARY POWER SOURCE OUTPUTS

Two constant, power limited auxiliary outputs are provided for powering keypads, motion sensors,

annunciator panels, electromagnetic door holders, relays, LEDs, etc. Choose between auxiliary

output #1 or auxiliary output #2.

Auxiliary Output #1 Range: 26.7V - 28.0V, Nominal

Auxiliary Output #2 Range: 12.6V - 16.5V, Nominal

NOTE: Both auxiliary outputs can be used at the same time for loads requiring different voltages (for

a combined maximum load current of 500mA). However, do not tie the aux. output #2 ground

(TB3, terminal 18) common to the aux. output #1 ground (TB3, terminal 16). Both of these

power sources must be isolated from each other.

CAUTION: IT IS RECOMMENDED TO USE OUTPUT #2 WITH EQUIPMENT THAT HAVE INPUTS

RATED FOR 12 - 24 VOLTS, AC OR DC. CHECK WITH THE MANUFACTURER

BEFORE CONNECTING 24VDC RATED EQUIPMENT ACROSS OUTPUT #1 TO

ENSURE THE HIGHER VOLTAGE WILL NOT CAUSE ANY DAMAGE.

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TROUBLESHOOTING

Before proceeding through the troubleshooting section, ensure that all device latches are not

binding against their corresponding strikes. A bound latch can cause sluggish electric pullback or

prevent pullback entirely.

Power Limited Outputs

All outputs to the 781N are power limited. Depending on the output, if a short circuit or an over load

condition should occur, the output will either shut off entirely or go into a safe current limiting state.

IMPORTANT!: THE MAXIMUM RATED LOAD FOR ALL OUTPUTS COMBINED IS 2.0 AMPS,

INCLUDING 250mA (MAX.) FOR EACH AUXILIARY OUTPUT.

The outputs to Device One (TB3, terminals 5 & 6) and Device Two (TB3, terminals 11 & 12) will

completely shut down to 0 volts when a short circuit across the output occurs or when the load

exceeds 5 amps. To reset the output, the short circuit or overload must first be located and removed.

Next, momentarily switch off the outputs by opening the contacts across input terminals 1 & 2 or 7

&8, whichever is used. Before switching outputs back on, ensure the load does not exceed the

maximum current ratings.

Both auxiliary outputs will go into a current limiting state when the load exceeds approximately 2.0

amps or in the event of a short circuit. The current is reduced to a safe level when either of these

conditions occur. The output voltage will automatically return to its normal level when the short

circuit or overload condition is removed and replaced by a load falling under the maximum current

rating.

Symptom:

Neither DEVICE ONE or DEVICE TWO pulls back after the control switch is activated.

Possible Causes:

1. The power limited output to Device 1 or Device 2 (or both) may have shut down.. When this

happens, the field wires that are run to the exit device are probably shorted together against the

conduit, door frame or electric hinge.

2. The slow blow 4 amp fuse (Littlefuse #239.004) inside the exit device has blown. The most likely

cause would be reversed polarity of the exit device red and black leads: RED = "+"; BLACK = "-".

(Refer to the wiring diagram for proper connection.) Other possible causes may be shorted wires

in the solenoid assembly or a defective pulse module.

3. An open connection in the field wiring between the power supply and control switch used for

activating latch pullback.

4. A defective control switch.

5. An open connection in the field wiring between the power supply and exit device.

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6. There may be no pulse. To check for pulses, prop the door open and connect a voltmeter across

the red and black leads coming from the exit device (red lead is positive). Next, connect a jumper

wire across terminals 1 and 2 of TB3 to keep DEVICE ONE in a continuous pulled back state. If

the voltmeter measures between 30 and 40 VDC at the moment the jumper wire was installed,

but the latch did not budge, then no initial pulse was generated. Check for a series of timed

pulses that will occur approximately every six seconds. (Make sure that the control rod is not

positioned over the reflective sensor on the pulse module when making this next check.) Wait for

about 20 seconds to see if the latch pulls back. If it still does not respond, then it indicates the

pulse module is inoperative and the entire solenoid/module assembly must be replaced.

Symptom:

When 120 volts is applied to TB1, the exit devices immediately pull back, even though the control

switch had not been activated.

Possible Causes:

1. Field wiring between the power supply and control switch are shorted together against the

conduit or switch mounting box.

2. A maintain switch is being used and is in the closed position.

3. A defective control switch.

Symptom:

A noticeable buzzing sound at equal intervals is coming from inside the exit device while in its

pulled back state.

Possible Causes:

1. The latch is binding against its corresponding strike and preventing it from pulling back fully, due

to misalignment between the latch and strike opening.

2. A defective pulse module.

NOTE 1: THIS UNIT IS LISTED AS AN EXIT DEVICE CONTROL UNIT TO UL294

REQUIREMENTS.

NOTE 2: THE POWER OUTPUT OF THE CONTROLLER IS OF A FAIL SECURE DESIGN. THE

EXIT DEVICE REMAINS LATCHED DURING A COMPLETE POWER FAILURE, BUT

ALWAYS ALLOWS FREE MECHANICAL EGRESS. LISTED PANIC HARDWARE MAY BE

REQUIRED TO ALLOW EMERGENCY EXIT. CONSULT LOCAL AUTHORITY HAVING

JURISDICTION.

Product Support Tel 800-810-WIRE (9473) • www.yalelocks.com

Yale® is a registered trademark of Yale Security Inc., an ASSA ABLOY Group company. Other products' brand names may be trademarks or registered trademarks of their

respective owners and are mentioned for reference purposes only. These materials are protected under U.S. copyright laws. All contents current at time of publication.

Yale Security Inc. reserves the right to change availability of any item in this catalog, its design, construction, and/or its materials.

Any retrofit or other field modification to a fire rated opening can potentially impact the fire rating of the opening, and Yale Locks & Hardware makes no representations or warranties

concerning what such impact may be in any specific situation. When retrofitting any portion of an existing fire rated opening, or specifying and installing a new fire-rated opening,

please consult with a code specialist or local code official (Authority Having Jurisdiction) to ensure compliance with all applicable codes and ratings.

Yale Locks & Hardware is a division of Yale Security Inc., an ASSA ABLOY Group company.

An ASSA ABLOY Group brand

80-9477-0781-010 (01-13)

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