Hendershot Door Systems

Model 3900 is a light-duty jackshaft operator for light-duty
commercial sectional applications only. It features a compact
design ideal for limited height, cathedral, or obstructed ceiling
installations. It may be used on standard and high-lift (maximum 7
ft. high-lift) sectional doors measuring up to 14 ft. high
and up to 18 ft. wide, but not exceeding 180 sq. ft. or 650 lbs.

 

STANDARD FEATURES

Motor: Heavy-duty 24VDC motor provides
ultra-quiet operation, along with variable speed smooth start and
stop.

Compact Design: Ideal for limited height, cathedral, or
obstructed celing installations; mounts mounts on the left or
right side of door and attaches to the torsion bar.

 

Push Button Station: 1-button station for OPEN
& CLOSE functions with type B2 control wiring is standard
for all operators. Controls with 1, 2 and 3 buttons are
available. 

The Protector System® Safety Sensors: A
"non-contact" photo safety sensor designed to sense an
obstruction and signal the door operator to reverse to open.

Warranty: Lifetime motor warranty.

 

OPTIONAL ACCESSORIES
Power Door Lock: Prevents the door from being manually
forced open once fully closed.

EverCharge® Standby Power System: Operates the door
operator for up to 20 full cycles within a 24 hour period.

Alternate Mounting Kit: Allows operator to be mounted
below the torsion bar.

Remote Work Light: Adds 200 watts of light with
adjustable light time delay; unlimited number of lights can be
added.

Keyless Entry: Allows door to open or close by using a
code programmed directly into the unit.

Model MJ is a Medium-Duty Logic jackshaft operator. It features a
compact design, an adjustable friction clutch, a standard solenoid
brake and a high-starting torque motor.

MEDIUM-DUTY LOGIC TECHNOLOGY
Added Value

 

Warranty: 2-year warranty.

CONTROL ACCESSORIES AND OPTIONS
Sensing Edge: (recommended) Designed to sense an
obstruction and signal door operator to stop or reverse as
desired. An electric or pneumatic sensing device can be added to
bottom edge of door.

Radio Control: Universal transmitters and
receivers are available to signal the operator to open and/or
close door.

Emergency Egress Device: Attractive faceplate mounts
flush on wall and contains handle to disconnect operator from a
grille, thereby allowing the grille to be opened manually or by
spring tension.

Rolling Door Interlock Switch: Interlock switch
disables the operator control circuit when a manual door lock is
engaged preventing damage to the door and operator.

CPS® Commercial Protector System: (recommended)
A "non-contact" photo safety sensor designed to sense an
obstruction and signal the door operator to reverse to open.

Model MH is a Medium-Duty Logic hoist operator. It features an
adjustable friction clutch, a standard solenoid brake, a
high-starting torque motor, a compact design and an emergency
chain hoist with an electric interlock.

MEDIUM-DUTY LOGIC TECHNOLOGY

Added Value

STANDARD FEATURES
Motor: Powerful 1/2 HP, 115V single phase motor with
instant reverse and internal automatic reset thermal overload.
Removable without affecting limit switch settings.

Operator/Motor Control: Dependable dual relay
system (NEMA 1 enclosure)

Control Circuit: 24V NEC Class 2.

Emergency Manual Operation: Model MH provides
easy emergency manual operation using a floor level disconnect and
an electrically interlocked chain hoist mechanism.

Brake: Heavy-duty solenoid actuated brake
standard.

Wiring Type: All operators are factory preset to
C2 wiring providing momentary contact to open and stop with
constant contact to close. Momentary contact to close (B2 wiring)
can be easily set. The operator is pre-wired to accept a sensing
device, photoelectric control, radio controls and most types of
access control equipment.

Drive Reduction: First stage heavy-duty 4L
V-belt; second and third stages #48 chain.

Bearings: Heavy-duty oil-filled bearings.

Push Button Station: 3-button station for
OPEN/CLOSE/STOP functions is standard for all operators. Controls
with 1, 2 and 3 buttons are available.

Construction: NEMA 1 type electrical box,
heavy-duty 11-gauge steel frame with baked-on powder coat finish,
all reduction sprockets drilled and pinned to shafts.

External Radio Control Terminal: External
terminals provide quick, convenient connections for universal
radio controls.

Friction Clutch: Adjustable friction clutch helps protect
against damage to the door and operator should the door meet an
obstruction.

 

Warranty: 2-year warranty.

CONTROL ACCESSORIES AND OPTIONS
Sensing Edge: (recommended) Designed to sense an
obstruction and signal door operator to stop or reverse as
desired. An electric or pneumatic sensing device can be added to
bottom edge of door.

Radio Control: Universal transmitters and
receivers are available to signal the operator to open and/or
close.

Rolling Door Interlock Switch: Interlock switch
disables the operator control circuit when a manual door lock is
engaged preventing damage to the door and operator.

Weathertight Control Devices: A variety of
weathertight control devices are available including 3-button
control stations, key control stations and digital keypads.

CPS® Commercial Protector System®:
(recommended) A "non-contact" photo safety sensor
designed to sense an obstruction and signal the door operator to
reverse to open.

Mechanical Reversing Contactor Circuit (M): (115V,
208/230V, 460V, 575V, 24V NEC Class 2 Circuit with 40VA
transformer) Industrial linear contactor provides significantly
longer control runs than conventional contactors.

STANDARD FEATURES
Motor: Continuous-duty high-starting torque motor
with instant reverse and overload protection.  Available in
1/3, 1/2, 3/4 and 1 HP; single- or three-phase. Removable without
affecting limit switch settings.

Drive Reduction: First-stage heavy-duty 5L
V-belt; second and third stages #48 chain; #50 drive chain.

Emergency Disconnect: Easy emergency manual
operation using an electrically interlocked floor level disconnect
and hoist mechanism.

Wiring Type: B2, C2, D1 and E2 wiring types
are standard and easily set using a selector dial on the Logic 3.0
Control Board (L3). T and TS wiring can be activated with use of a
CPS-L or CPS-LN4. Reversing Contactor Units (M) have C2 wiring
standard and B2 available by simply moving a jumper wire.
Operators are pre-wired to accept a sensing edge, photoelectric
sensors, radio controls and most types of access control
equipment. Failsafe wiring can be selected with use of a CPS-L,
CPS-LN4 or failsafe edge and CPS3 card.

External Radio Control Terminal: Quick,
convenient connections for retrofitting or adding radio controls
on logic or mechanical operators.

Bearings: Industrial ball bearings on a
1" output shaft; heavy-duty oil-filled iron bearings on
reduction shafts.

Friction Clutch: Adjustable, helps protect
against major damage to door and operator should the door meet an
obstruction.

Construction: NEMA 1 type electrical box,
heavy-duty 11-gauge steel frame with durable powdercoat finish,
all reduction sprockets drilled and pinned to shafts.

Push Button Station: 2-button station for
OPEN/CLOSE functions is standard with D or D1 wiring. 
3-button station is standard with B2 or C2 wiring.

PosiLock® Mechanical Brake System: Self-locking
mechanical reduction system that functions as a holding brake.

Warranty: 2-year warranty.

CONTROL ACCESSORIES
CPS® Commercial Protector System®: (recommended) A
"non-contact" photo safety sensor designed to sense an
obstruction and signal the door operator to reverse to open.

Sensing Edge: (recommended) Designed to
sense an obstruction and signal door operator to stop or reverse
as desired. An electric or pneumatic sensing device can be added
to bottom edge of door.

Mechanical Reversing Contactor Circuit (M): (115V,
208/230V, 460V, 575V, 24V NEC Class 2 Circuit with 40VA
transformer) Industrial linear contactor provides significantly
longer control runs than conventional contactors.

STANDARD FEATURES
Motor: Continuous-duty high-starting torque motor
with instant reverse and overload protection.  Available in
1/3, 1/2, 3/4 and 1 HP; single- or three-phase. Removable without
affecting limit switch settings.

Drive Reduction: First-stage heavy-duty 5L
V-belt; second-stage #41 chain; output on trolley #48 chain on 1/3
and 1/2 HP; #41 chain on 3/4 and 1 HP.

Emergency Disconnect: Spring-loaded for
emergency manual operation.

Wiring Type: B2, C2, D1 and E2 wiring types
are standard and easily set using a selector dial on the Logic 3.0
Control Board (L3). T and TS wiring can be activated with use of a
CPS-L or CPS-LN4. Reversing Contactor Units (M) have C2 wiring
standard and B2 available by simply moving a jumper wire.
Operators are pre-wired to accept a sensing edge, photoelectric
sensors, radio controls and most types of access control
equipment. Failsafe wiring can be selected with use of a CPS-L,
CPS-LN4 or failsafe edge and CPS3 card.

External Radio Control Terminal: Quick,
convenient connections for retrofitting or adding radio controls
on logic or mechanical operators.

Bearings: Ball bearings on output shaft;
heavy-duty, oil-filled bushings on reduction shafts.

Brake: Solenoid-actuated brake is standard
on 3/4 and 1 HP units to prevent coasting of door. Optional on 1/3
and 1/2 HP units.

Friction Clutch: Adjustable, helps protect
against major damage to door and operator should the door meet an
obstruction.

Construction: NEMA 1 type electrical box,
heavy-duty 11-gauge steel frame with durable powdercoat finish,
all reduction sprockets drilled and pinned to shafts.

Push Button Station: 3-button station comes
standard and has OPEN/CLOSE/STOP functionality.

Quick-Mount Header Bracket: For fast,
swing-up mounting.

Rail Assembly: High-strength dual L-rail
track with nylon quiet-gliding chain guides on rail spacers for
quiet, smooth operation.

Warranty: 2-year warranty.

CONTROL ACCESSORIES
CPS® Commercial Protector System®: (recommended) A
"non-contact" photo safety sensor designed to sense an
obstruction and signal the door operator to reverse to open.

Sensing Edge: (recommended) Designed to
sense an obstruction and signal door operator to stop or reverse
as desired. An electric or pneumatic sensing device can be added
to bottom edge of door.

Model MT is a Medium-Duty Logic trolley operator for standard lift
sectional doors. It features a high-starting torque motor, a
compact design, quick-gliding rail spacers and a quick-mount
swivel header bracket.

MEDIUM-DUTY LOGIC TECHNOLOGY

Added Value

STANDARD FEATURES
Motor: Powerful 1/2 HP, single phase motor with instant
reverse and internal automatic reset thermal overload. Removable
without affecting limit switch settings.

Auxiliary Reversal System: Designed to protect
the door and door operator from damage; if a closing door strikes
an obstruction, the Auxiliary Reversal System will detect the slip
of the clutch and reverse the door to the full open position. This
system is not a substitute for a safety sensing device such as a
photo cell or reversing edge.

Wiring Type: All operators are factory preset to
C2 wiring providing momentary contact to open and stop, with
constant contact to close. Momentary contact to close (B2 wiring)
can be easily set. The operator is pre-wired to accept a sensing
device, photoelectric control, radio controls and most types of
access control equipment.

Rail Assembly: High strength dual L-rail track
with exclusive nylon quiet gliding chain guides on rail spacers
for quiet, smooth operation. Includes quick-mount header bracket
which provides fast, swing-up installation.

Operator/Motor Control: Dependable dual relay system (NEMA
1 enclosure).

Control Circuit: 24V NEC Class 2.

Drive Reduction: First stage heavy-duty 4L
V-belt; second and third stages #48 chain; output on trolley #48
chain.

Emergency Disconnect: Spring-loaded disconnect for
emergency manual operation.

Push Button Station: 3-button station for
OPEN/CLOSE/STOP functions is standard for all operators. Controls
with 1, 2 and 3 buttons are available.

Construction: NEMA 1 type electrical box,
heavy-duty 11-gauge steel frame with baked-on powder coat finish,
all reduction sprockets drilled and pinned to shafts.

Bearings: Heavy-duty, oil filled bearings.

External Radio Control Terminal: External
terminals provide quick, convenient connections for universal
radio controls.

Friction Clutch: Adjustable friction clutch helps protect
against damage to the door and operator should the door meet an
obstruction. Works in conjunction with the Auxiliary Reversal
System.

Warranty: 2-year warranty.

CONTROL ACCESSORIES AND OPTIONS
Solenoid Brake: Solenoid actuated brake prevents
coasting. Order operator BMT. Standard on 3/4 HP and higher.

Auto-Reconnect Trolley Assembly: Spring-loaded trolley
features nylon inserts for quiet operation and auto-reconnect
feature eliminating the need to manually reattach the door arm to
the trolley after emergency disconnect.

Sensing Edge: (recommended) Designed to sense an
obstruction and signal door operator to stop or reverse as
desired. Either an electric or pneumatic sensing device can be
added to bottom edge of door.

Radio Control: Universal transmitters and
receivers are available to signal the operator to open and/or
close.

Key Switch: Designed to restrict operation of
door to authorized personnel only. Various types available.

Interlock Switch: Prevents accidental operation
of the door by interrupting the control circuit.

CPS® Commercial Protector System®:
(recommended) A "non-contact" photo safety sensor
designed to sense an obstruction and signal the door operator to
reverse to open.