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Medium-Duty Trolley Operator
For Smaller Standard Lift Doors


The MLT is a medium-duty trolley operator designed for use on smaller and low-cycling industrial standard lift sectional doors.

It features a high starting torque intermittent-duty industrial type motor and a quick release disconnect arm.

The operator is available with the new Electronic Control Board (BOARD 070) with or without the option of electrical control for MONITORED external entrapment protection devices (UL325-2010 compliant).

1/2 HP, 115V single phase intermittent-duty motor with instant reverse and internal automatic reset thermal overload protection. Removable without affecting limit switch settings... Also available with 50Hz motor, consult inside sales.

First step in reduction 4L/A V-belt drive, additional step by #410 chain and sprockets. Input shaft is 5/8", supported by ball bearings. Output shaft is 1", supported by ball bearings. Output shaft speed: 112 rpm for a door travel of 11"/s.

Drive and Trolley Assembly:
#48 (410) full roller chain drive. Dual, 12 gauge, pre-drilled galvanized tracks provided for doors up to 12Ft in height standard. Additional track lengths are available (max. door height acceptable for the operator limit system is 14FT). Track spacers 3/4" steel shaft. Trolley made of cast aluminum alloy with chain tension adjustment device.

Friction type, positioned on input shaft, easily adjustable from outside.

Manual Operation:
Quick release disconnect arm for manual push-up operation.

Electrical Enclosure:
All electrical components are in a Nema 1 enclosure. Hinged cover.

Limit System:
Rotary-type oil-impregnated steel cams, commercial grade switches. Limit shaft is supported by self-lubricating bronze bushings for increased precision. Remains in time when there is a manual operation or after the motor has been removed.

Corrosion Protection:
Frame and control enclosure protected by baked on, long lasting enamel finish. Polymer control box cover. All shafts protected by yellow chromate coating.

Ceiling-mounted with only 6.500" headroom clearance required below the tracks.

Shipping Weight:
Approx. 60 Lbs - 27 Kg + tracks.

2 Years, per section 6 of our Terms and Conditions of Sale.

ECB Units (BOARD 070):
24VDC relaying circuit with a 40VA class II transformer, non-volatile memory. Features available: 1.5s delay on reverse, programmable maximum run timer, mid-stop, timer to close (suspension possible from floor level), independent input loop terminal, advance close system, test buttons, reverse wiring detection and door lock sensor. Operating mode selectable on site: C2, B2, D1, E2, T or TS.

Electronic Monitored (M) Version:
Provides the monitoring of Primary External Entrapment Protection Devices. Includes monitored photo cells (PHOTO 062 standard). In this mode, Ancillary Entrapment Protection Devices (optional) may be used to supplement primary entrapment protection, such as non-monitored photo cells, 2-wire non-monitored sensing edges and pneumatic sensing edges.
Certifications: CSA C22.2-247.92 and UL325.

Electronic (E) Version:
No monitoring function.
Certifications: CSA C22.2-247.92 and UL325 5th Ed. PRIOR to August 2010 revision.


Electromechanical Units:
24VAC control circuit, 40VA class II transformer, fuse protected on output.

B2/C2 Units:
C2 wiring is standard. B2 can be set very easily by moving one wire. Available options: delay on reverse, timer to close, double limits, etc...
Certifications: CSA C22.2-247.92 and UL325 5th Ed. PRIOR to August 2010 revision.


Control Accessories:
Terminal strip allows for the connection of 3-button stations (one supplied with the operator), non-monitored sensing edges, non-monitored photo cells, one push-button radio control(external strip), ceiling pull switches, key switches, loop detectors, external interlocks, plug-in radio card and universal auxiliary output module. 2A fuse protected 24VAC output is available for accessory power supply. NEMA 4/12 or NEMA 4X protected monitored photo cells upgrade available.

Mechanical Accessories:
Very heavy-duty front idler, etc...consult inside sales.

Mechanical Modifications:
Disc-type solenoid brake (electromechanical units only), etc...consult inside sales.



Consult our Accessories and Replacement Components page.


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