Closing the Door with the Arrow 7700 Power Door Operator

An Arrow 7700 is installed onto an interior office entry door within a large teaching facility. The office has a drop ceiling with an electrical connection box above the drop ceiling, approximately ten feet away.

The HES 8000 Series is an ANSI/BHMA A156.31, Grade 1 electric strike. The compact unit using an ASA faceplate is designed to operate with cylindrical locksets. The 8000 Series accommodates a 1/2”-5/8” throw latchbolt with sufficient door gap. The electric strike in the Fail Secure mode requires 0.12 Amps @24VDC.

For this installation, some modifications had to be made to the support bracket and the internal structuring of the doorjamb to accommodate the electric strike. For both the switch and the electric strike, an eight conductor, 22 gauge cable was run from the door operator’s power supply through the header portion of the doorjamb and down the strike jamb. Two wires were required for power for each. Powering the electric strike in the Fail Secure mode, release the latch mechanism, permitting the door to swing open.

The switch requires two additional wires in order to activate the operator. A 50-foot Fish Tape and custom made wire pulling tools were used for the wire run. The Fish Tape was used to run the wiring from the top of the doorjamb down the strike jamb and out the strike opening. The tip of the fish tape was slid between the drywall and the doorjamb. Work was completed carefully as not to damage the drywall.

The wall switch was installed 40 inches above the finished floor. The switch was mounted onto a single gang low voltage old work bracket. A hole was drilled from the drywall cutout into the cavity created by the strike jamb in order to run the wires to the wall switch. The electric strike has an adjustable ramp with a center slot to accommodate the deadlatch. The ramp is vertically adjustable. The ramp was adjusted for the location of the deadlatch. The door was opened and closed several times to insure the deadlatch slid between the ramps.

A four-position terminal strip is mounted to the back plate on the right side of the motor. The upper two terminals are for dry activation inputs and the lower two are lock outputs. The dry activation inputs are for the hardwired switches, card readers, etc. Lock outputs are for the electric strike, magnetic lock or electrified latch retraction lock or device. The activating switch will unlock the locking mechanism and then the power operator will open the door.

Note: Be sure to set the jumper for the operation of the locking mechanism.

For this installation, the electric strike will operate in the Fail Secure mode. This requires momentary power to operate. Power is provided from the Normally Open (NO) by closing the relay. The electric strike wiring pulled 24VDC power from the terminal strip adjacent to the motor. The positive wire leading from the terminal strip was switched at the relay and connected to the electric strike. The negative wire was run from the terminal strip to the electric strike.

Once the door operator, the electric strike and the switch were wired and installed, the next series of steps were power the operator, test the system and to make adjustments. The Arrow 7700 was powered, the breaker switch and the green LED on the inverter control board illuminated. The electric strike released the latchbolt and the door swung open. After about 20 seconds, the door began to swing closed. The adjustment is from a minimum of five seconds to 30 seconds.

A “hold-open” switch can extend the door open time. When the door was closed and latched, the position of the open magnet was moved slightly to approximately 85 degrees. The Touchless switch and the Push & Go function were tested.

The next series of steps were to make the fine adjustment. There are six potentiometers on the inverter control board. Clockwise rotation increases and counterclockwise rotation decreases all functions. The functions are:

Potentiometer 1: Motor Torque at Hold Open Backcheck Position. Right side bottom

Potentiometer 2: Sweep Closing Force (90 to 20 degrees), Right side middle

Potentiometer 3: Motor Delay on Opening, Right side top

Potentiometer 4: Hold Open Time* (0 to 30 seconds), Left side bottom

(*ANSI/BHMA A156.19 requires the door to remain in the open position for a 5 second minimum.)

Potentiometer 5: Obstruction Detection on Open, Left side middle

Potentiometer 6: Latch Force (20 to 0 degrees), Left side top

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