brookfield industries, inc.

99 West Hillside Ave

Thomaston, CT 06787

T: 860.283.6211, F: 860.283.6123

www.bfimfg.com

NB-4120-2-DC Sliding Door Operator

Description:

The NB-4120-2-DC, Single and Bi-Parting Sliding Door Operator, is designed and tested for lead shielding doors weighing up to 35,000 lbs (single door)/17,500 lbs (each bi-parting door), operating at linear speeds of 6.0 in/sec maximum (single door)/12.0 in/sec maximum (bi-parting doors), or a maximum horizontal operating force of 700 lbs

(single door) or 350 lbs (each bi-parting door). The drive train features a 2” wide (H) pitch, polyurethane, steel reinforced timing belt, coupled to a ¾ hp, 90VDC, helical-bevel (high torque) gear motor. Since the drivetrain features a ¾ hp DC motor, this operator also includes a Battery Backup System and Manual Operation as a redundant backup for power interruption. Applications involving heavier doors at slower speeds/acceleration rates should be

referred to the Engineering Department.

The NB-4120-2-DC is designed to be used in conjunction with an existing linear bearing/rail system capable of supporting heavy doors with a low coefficient of friction or standard beam trolley supports for hanging the door.

The open ended style timing belt normally clamps to the side of the door carriage/attachment structure. Once the timing belt has been properly aligned and pre-loaded, in addition to the motor control parameters being correctly set, the NB-4120-2-DC will provide many years of maintenance free service.

The PLC (Programmable Logic Control) is programmed by the manufacturer to accept input signals from an external (4) button station (including open, partial open, close and stop commands). Additional I/O

(input/output) are featured with the NB-4120-2-DC to accommodate inputs from infrared presence sensors and pressure sensitive tape switches that will either stop or reverse the door to the open position, when activated in the closing cycle. All input commands to the PLC are class 2, low voltage. There are no limit or proximity switches to adjust or install. Simply adjust the door’s positioning presets as required by interfacing with the

PLC via a hand held Data Access Unit (purchased separately).

Rating a Sliding Door Operator:

The rating of a sliding door operator in any particular installation cannot be based solely on the weight of the door. Other factors such as linear bearing alignment, coefficient of friction, and acceleration/deceleration rates may have a substantial affect on the total axial force acting on the door operator components. We have factored these variables into the Rated Maximum Operating Forces. This assures the customer they are getting the most dependable product at a reasonable cost over the life expectancy of the operator.

Maximum Operating Force* = 700 lbs (3115 kg) (total)

Maximum Rated Linear Speed = 6.0 in/sec (15.24 cm/sec)

Maximum Door Weight =

Minimum Rated Cycles =

35,000 lbs(15,890 kg) (total)

500,000 openings and closings

Maximum Travel = Unlimited

*The maximum horizontal force acting on the timing belt assembly in order to accelerate the mass of the door to the maximum operating speed and to overcome friction and any misalignment.

Specification:

1) Supply voltage: 115VAC +/- 10% (230VAC for European service) 50/60 Hertz single phase. In-Line circuit breakers supplied with motor control and PLC. Surge protection, line filters, and EMI ferrites shall be included.

2) Battery Backup (standard): Opens the door during power interruption only. (2) 12VDC, 7.0 Ah battery with float chargers and test switch shall be included along with an end of travel limit switch to disconnect the motor.

3) Current Consumption: maximum 12 amperes.

brookfield industries, inc.

99 West Hillside Ave

Thomaston, CT 06787

T: 860.283.6211, F: 860.283.6123

www.bfimfg.com

4) Entrapment Protection: The NB-4120-DC Commercial/Industrial Sliding Door is compliant with UL

325 Section 30.2 External Entrapment Protection (Fail Safe/Self-Monitoring) providing all External

Safety Devises are wired and installed per this manual.

5) Absolute position feedback control: this assures the CPU always knows the door’s position. During installation, a power interruption, or if electrical noise is encountered, the door is not required to be

“homed”, “reset” nor go through a “learn speed cycle” at any time. Also, limit or proximity switches are not required for controlling the door’s position.

6) PLC/Logic Control: a) Shall be a PLC with sufficient I/O and a CPU (Central Processing Unit) with adequate memory, response times and scanning rates in order to properly control the motion and positioning of Linear

Accelerator Sliding Doors. b) Outputs commands shall be the internal type, integral with the PLC. No external limit or proximity switches shall be allowed for control of door positioning. c) A means to interface with the PLC for adjusting preset values for the open, partial open, closed, creep closed and creep open positions. d) Diagnostics and troubleshooting of the PLC shall be provided with LED and modular plug-in components. e) The PLC shall be provided with an internal battery to store the door position presets in the CPU memory.

7) Motor: 3/4 hp permanent magnet 90 volt DC motor 1750 RPM TEFC with rear shaft extension.

8) Motor Control: shall be a full-wave, four quadrant, regenerative, 90 VDC variable speed control with the following functions:

FWD/REV maximum speed FWD/REV current limit

FWD/REV acceleration/deceleration 1% speed regulation

IR compensation

50:1 speed range.

9) Speed Control: a means of controlling independent forward and reverse speeds as well as controlling end of travel (latch check/back check speeds). This can be accomplished externally with speed pots or internally with the PLC.

10) Drive train: shall be designed to assure each component (including gear reducers, timing belt and structural parts) from the motor to the door attachment point is properly “sized” in order to transfer all operating torques and forces as defined for Linear Accelerator Sliding Doors.

11) Enclosure: NEMA 1 vented enclosure of sufficient size (24” x 20 x 6-5/8”) to house the PLC, motor control, speed pots, battery backup system and terminal strip hookups. Enclosure shall have separate penetrations for supply voltage, safety sensors, push buttons, motor and positioning transducer hookups.

All penetrations shall be drilled for ¾” conduits or the equivalent metric size for European installations.

12) Raw Materials: ASTM A36, AISI 1018 cold rolled steel, Aluminum 6061-T6511, Structural tubing ASTM A-

500, grade 5 bolting or better.

13) Mounting hardware: the NB-4120-DC shall be mounted with (8) 3/8” grade 5 diameter bolts with compatible washers and lock washers. Hardware must also be properly tightened with adequate thread engagement.

14) Finish: all exposed metal surfaces shall be prime painted.

15) Functionality test: each NB-4120-DC is cycle tested in position for 24 hrs. prior to shipment. Each unit is checked for leaks and that all I/O are functioning properly.

16) Manual Operation:

A flexible shaft engages and disengages into the rear shaft of the motor via a remote control cable. A lever arm activates the remote control cable and a 7” diameter hand wheel is connected to the flexible shaft for smooth operation. The hand wheel and lever arm are contained in a NEMA 1 enclosure. Approximate opening time, is 2.5 minutes. Opening force at the hand wheel is not more than 50 lbs with power removed (ref. UL 325 29.3) Important: the flexible shaft shall not be engaged to the motor unless

power to the operator has been interrupted.

17) Installation: Please refer to the NB-4120-2-DC Door Operator Manual, Installation instructions and

Drawings: NB-4120-2C4, NB-4120-2DC4, NB-4120-2DC8, NB-4120-2DC9, NB-4120-2P2, NB-4120-2-DC-

Travel and NB-4120-2-DC-SingleSlide-1