Crane Description PDF Print E-mail
Combine light weight construction
Heavy weight strength, power and durability
Space saving design
Smallest wheel load
Lowering building height
Smaller hook approch
Maintenance free
Long time reliability
Superb handling characteristics
Main Girder
Optimized design, box type girder
Welded from certified steel plates
Automatic or semi-automatic welding (mostly MIG and submerged)
Special assembly jigs ensure the proper alignment of the crane
All material is careful inspected and cleaned by sand blasting (Sa2.5)
An optional full-length service platform along the crane bridge can be supplied for double girder cranes, Protective hand railing and toe strips is equipped.
Vertical deflection due to maximum load (SWL) is designed and guaranteed to be better than 1/750 of the crane span unless specified
Lifting Machinery and Motor
Hoist motor, gearbox and drum form a revolutionary compact and sturdy package and offers efficient use of floor space under the crane and increased lifting heights.
Machinery has smooth and silent operation that extends the lifetime of the hoist.
The hoist motor is located inside the oversized rope drum to minimize the hoist outside dimensions and to increase the cooling effect of the hoist motor.
An enclosed hoist housing protects the rope drum, rope guide and limit switch equipment from dirt and climatic conditions.
The hoist and trolley frame is painted with epoxy paint for maximum resistance against climatic conditions, extending the hoist's working life.
Hoist motors are 2-speed pole changing (or frequency converter motors for stepless speed control) squirrel cage motors.
All motors incorporate a cylindrical rotor, class F insulation and are rated for minimum 60% ED duty. Motors are totally enclosed to IP55 degree of protection as standard.
The stator frame is made of extruded aluminum to maximize the dissipation of heat together with the fan mounted on the back of the motor.
All hoist motors are equipped with imbedded bi-metallic thermal switch
(or thermistors) in the windings to protect against overheating.
Trolley motors are frequency converter squirrel cage motors and controlled
by invertor.
The travelling speed motion is full stepless speed control.


All hoist motors are equipped with DC magnetic disk brakes.
The hoist motion brakes are adjustment free.
The hoist motor and brake are designed and manufactured to work together so that the load will not slip at any point of starting or stopping of the hoist or lower motions.
In the event of a power failure the brake will fall safe ON. The brake torque is at least 1.8 times higher than the nominal torque of the motor.
Brake linings are asbestos-free and the brakes are fully covered and dust proof.
CDesc6 Limit switch
Adjustable, 4-step, geared, self re-setting hoist and lower limit switches are provided as standard to prevent over travel of hook.
The upper direction limit switch has 3 steps. The first step switches the speed from fast to slow and the second step from slow to stop. The third step cuts the hoist movement in case of phase mismatch.
CDesc7 Drum and wire rope
Large diameter rope drum and rope pulleys extend the rope's lifetime.
With a large diameter rope drum the hook's horizontal movement and rope's fleet angle are minimized.
This True Lift feature ensures accurate load positioning.
The rope drum is turned from high quality steel tubing and has precision machined grooves for the rope, preventing rope overlap.
The rope drum is supported at both ends on bearings and the rope is fixed to the drum with rope clamps.
The drum has a minimum of two dead turns of rope with the hook in the lowest position.
Ropes are manufactured from high tensile steel and galvanized as standard.
The rope guide is wear resistant, heavy-duty, made of spheroidal graphite cast iron, maintaining the rope in the grooves.
A spring operated guide roll in the rope guide prevents slack rope.
The rope pulleys are made from spheroidal cast iron and the construction of large diameter pulleys ensures that the rope is retained in the pulley.
CDesc8 Gear-motor
Bridge and trolley motors are gear-motor type and frequency converter squirrel cage motors and controlled by invertor.
The travelling speed motion is full stepless speed control.
Travel motors are equipped with Compact brakes. The stator winding opens the brake instead of a DC coil and brake rectifier.
The travel motor brake is adjustment free.
Condition Monitor Unit(Option)
As an option the NOVA hoist can be equipped with a "ControlPro" Condition monitoring unit.
The latest FEM and ISO standards replaced the definition of the expected lifetime of hoists with the "Safe Working Period" (SWP). This refers to the actual working life of a hoist and not the time since installation. To comply with the standards, SWP values must be regularly monitored.
Condition monitoring unit is the most practical, easy to use and sophisticated measuring device on the market.
With condition monitoring unit, all recording functions, such as SWP, motor runtime, motor starts, number of overloads and calculations are performed automatically.
In addition to the SWP calculation, the ControlPro stops the hoist if overloading or overheating of motor occurs, and this results in increased safety and optimized maintenance activities.
CDesc10 Electrification and outfitting
Power for the crane is taken through a down-shop power supply line where the current is fed through the manual Main Disconnect switch (located at the bridge control panel).
With this, the entire crane can conveniently de-energized for maintenance/service or longer periods.
After the Main Switch, current is taken through main fuses to a main contactor, which is controlled from an emergency stop push button on the pendant.
After the main contactor the current goes through a protection switch (short circuit protection with automatic trip or fuses), and further to overload switches and thermal protection system for the hoisting motor.
The power supply system is equipped with a phase control guard that opens the main contactor in case of phase failure.
The control voltage is taken to the control circuitry through isolating transformer.
All hoist and crane movements are independent and can be run simultaneously.
Contactors are magnetic type and designed for crane applications, rated for severe vibration.
Mechanical interlocking is used in contactors that control movements in opposite directions, preventing accidental, simultaneous contacting.
The electrical equipment of the crane is located in the bridge and hoist control panels.
The control panels are manufactured of steel plates and finished to withstand corrosion.
The components are positioned in a maintenance friendly way, and the whole layout provides good protection against accidental contact.
The multi-wire type fixed cables with plastic insulation are intended for crane usage.
Cables are coded either with numbers, colours or tags for easy identification.
The cables used for festoons are PVC insulated flexible flat cables rated for 450/750V, specially designed for cranes, hoists and monorail systems.
Festoon cables are suspended on cable saddles, fixed to cable trolleys,running in a galvanised C-track, which is connected to the main girder with bolted or welded support brackets.
CDesc13 Trolly Rail
Material: ST52 Hot rolled steel bar
Lighter weight
Larger effective touching area
Smothly running
Contact Romack Crane