Brookfield NB-4120-2-DC User manual

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 = 35,000 lbs(15,890 kg) (total)
Minimum Rated Cycles = 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 IR compensation
FWD/REV acceleration/deceleration 1% speed regulation 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