The NB-4120-1 Double Belt, Bi-Parting Sliding Door Operator

is designed and tested for lead shielding doors weighing up to 70,000 lbs (total both doors) operating at linear speeds of 6.0 in/sec maximum (each leaf in opposite directions) or a maximum horizontal operating force of up 1400 lbs (total both doors). Bi-parting doors of different widths can be synchronized to open and close at the same time by using a specific ratio of pulley diameters between the (2) door widths.

The NB-4120-2 Single Belt (Bi-Parting or Single) Sliding Door Operator

is designed and tested for lead shielding doors weighing up to 35,000 lbs (total both doors) operating at linear speeds of 6.0 in/sec maximum (each leaf in opposite directions) or a maximum horizontal operating force of up 700 lbs (total both doors).

This is accomplished with a linear drive system comprised of a 2" wide H polyurethane steel reinforced timing belt coupled to a 2hp AC, high torque, in-line helical gear motor.

The NB-4120

is designed to be used in conjunction with a linear track system (by others) capable of supporting heavy doors with very low coefficient of friction. The open ended style timing belt is designed to be clamped directly to the side of the door carriage. Once the timing belt has been properly aligned and pre-loaded, in addition to the motor control parameters being correctly set, the NB-4120 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 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 HMI (purchased separately).

The NB-4120 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.

Unit of Measure

Door Wt 1

N/A 70000 lbs.

Max Operating Force 2

N/A 1400 lbs.

Travel (max. in one direction)

N/A Unlimited in.

Rated Linear Speed (max.)

N/A 6 in./sec.

Single/Bi-Parting

N/A Bi-Parting ONLY

Mounting Style

N/A Front

Drive Train

N/A Timing Belt (double belt)

Minimum Rated Cycles (openings and closings)

N/A 500000