Product Overview
Heavy-Duty Crane Brakes
The GH505 Series is a comprehensive range of Heavy-Duty Brakes for use on Crane Machinery such as Tower Cranes, Gantry Cranes, Overhead Cranes, Hoists & more. Utilised for both stopping and parking, our magnetic crane brakes are offered in seven sizes with torque ratings ranging from 10 to 9000 lb-ft, they meet the requirements of AISE Standard Nos. 6 and 11. Electrically released and spring-set ensures that when power is removed from the coil, a braking force is provided.
With a waterproof stainless-steel housing for the DC magnetic coil & cast ductile iron crane brake wheels, the GH505 Series is ideal for a range of heavy-duty industrial crane applications.
The cranes brake’s design is one of the most straightforward on the market with only 35 pieces. Made up of a base, a brake wheel for mounting on the proper rotational shaft, two armatures, two shoe levers, and a brake coil, the braking coil is made to work with direct current electricity.
Over the Wheel Design
The braking power is evenly distributed ensuring that both shoes get the same amount of force for maximum stopping power.
Minimised Wear
Owing to the huge bearing area and tight tolerances, wear at the shoe levers is minimised.
Encapsulated Coil
Encased in a stainless-steel housing, the coil has complete environmental protection to ensure a lengthy service life.
Long-Life Brake Wheels
Ductile iron can withstand the high temperatures brought on by frequent braking operations in a range of conditions.
Easy Brake Torque Adjustment
The unique & easy torque adjustment knob prevents the spring from being overtightened, removing any risk of stud breakage.
One-Time Shoe Positioning
The brake shoes are tightly fastened to the brake shoe levers to prevent both tilting and “riding the wheel” when the brake is released.
Repair and refurbishment services are available.
Crane Control Master Switches
Type F Master Switches – GH101
A cam operated, vertical type control circuit master where straight line operation of the handle is achieved by means of a right-angle bevel gear assembly.
A maximum of 16 circuits and 6 speed positions are available in the step type master. A maximum of 6 circuits and a directly coupled potentiometer are available in the stepless master.
Master switches are furnished with a positive mechanical stop located in the operating head of the switch. Masters are available both as open devices for benchboard mounting, and NEMA 3 enclosed for wall or floor mounting. Suitable for a variety of crane machinery applications.
Type C Master Switches – GH103
The Type C Master Switch is a cam operated control circuit master switch. Ideal for a wide range of industrial crane tasks.
A maximum of 6 circuits, it can be supplied with a NEMA 1 sheet steel enclosure, or open for benchboard mounting.
Cams are directly driven by the operating handle and are supplied as “universal” cams with “daisy petal” twist offs which can be broken away to obtain any desired operating sequence.
Crane Limit Switches
Powered Limit Switches
These Crane Power Limit Switches are mounted on the crane trolley to prevent overtravel of the crane hook when hoisting. They act as a power circuit disconnect for the crane hoisting motor. On DC applications, a resistor is required with the limit switch to provide dynamic braking. These limit switches are suitable for a wide range of crane machinery and other moving devices.
Crane Limit Switch Features
- Single and duplex types
- 50 hp to 500 hp range, ac or dc operation
- Double-pole, double-throw power circuit contacts
- NEMA 3 enclosed
Heavy-Duty Limit Switches
These Heavy-Duty Control Limit Switches are designed for use with overhead cranes, gantry crane, hoists, conveyors and similar types of moving machinery.
They are supplied with three non-overlapping contacts and with spring return or maintained lever operation. The spring return capability and circuit arrangement can be converted in the field. Standard spring return switches operate in one direction only (contacts change state when lever is moved in one direction from centre).
The spring return type is optionally available with lever operation in either direction (contacts change state when lever is moved in either direction).
High Speed
Designed for use in high-speed applications such as crane trolleys, conveyors, and similar types of moving machinery.
Our High Speed Limit Switches are supplied with three non-overlapping contacts and maintained lever operation.
Foot Operated
Designed for use in mill applications, on moving machinery, or in other heavy-duty applications.
They can be used as STOP devices or master switch controls. They are supplied with three contacts without overlap.
Cable Operated
A latched-in type safety switch for use on rubber mills, calendars, tubers and Banburys.
A slight movement of the trip lever moves the star wheel to the trip position to cause a quick, positive operation of the contact mechanism.
DC Crane Contactors
Type C80 DC Contactors
Featuring forged steel armature levers and magnet frames for superior physical strength, these DC Mill type contactors contain self-lubricating bearings to reduce downtime and are ideal for heavy industrial crane environments.
Hinged to provide easy access for repairs and inspections, their arc chutes and magnetic blowout structures are designed to quickly absorb and dissipate the heat caused by arcing. The pivot pin assembly provides positive pin locking so that the bearing pin remains stationary with respect to the operating movement of the forged armature. A leaf spring attached to the unit base and the arc chute holds the chute in the “down” or functioning position.
Pre-drilled mounting holes are provided on the unit base to accommodate interlock mounting brackets. An interlock is merely attached to a bracket and the assembly is then bolted in the desired operating position on the contactor.
Type C82 Inductive Time Limit Contactor
These mill type DC Inductive Time Limit (Ltl) contactors use two coils; one a normal closing coil, and a holdout coil. When the closing coil is energised, the contactor will not pick up until the magnetism of the holdout coil has decayed sufficiently to permit the contactor to close.
By connection of the holdout coil (H.O.) to various points in control circuits, the Ltl contactor can be used to control acceleration or plugging in hoist and travel panels.
The construction of the arc chute, blowout and power contacts of these contactors is the same as for C80 DC contactors with parts being interchangeable between the two types.
Course adjustment of the timing is accomplished by removing shims to vary the air gap of the holdout coil circuit. Fine adjustment is made with a knurled nut at the base of the holdout coil magnet core.
DC Contactors — Types KD & KS
Bulletin 7400 Type KD (Normally Open Pole) and Type KS (Normally Closed Pole) contactors are designed for front mounting directly on steel panels and require no special hardware or insulators. Electrical clearances are factored in with hot-moulded reinforced polyester insulators.
Like the C80 contactors, the KD & KS range utilise DC coils and features forged steel armature levers and magnet frames for superior physical strength. Their self-lubricating bearings combined with the short stroke armature results in a mechanical life of more than 20 million operations.
The arc chutes and magnetic blowout structures are designed to absorb and dissipate the heat caused by arcing quickly. In addition to increasing contact life, the moulded arc chute offers advantages of improved mechanical life and cooling characteristics plus superior arc-tracking resistance.
Designed with a front-mounted combined head assembly, the Type K contactors are available with blowout coils rated 3, 7.5, 15, 25 and 50 amperes or without blowout, and are easily changed in the field.
Features
Thirty years of continual improvements ensure the KD & KS ranges offer long life, low maintenance and interchangeable parts
- Front connected for direct to steel mounting
- Solid steel backplate provides maximum strength and rigidity
- Hot moulded, reinforced polyester insulators
- Shrouded knife-edge pivot design excludes dirt
- Encapsulated coil protects against damage
- Conveniently placed power terminals
Relays
Low Voltage Monitoring Relays
Low Voltage Monitoring Relays (LVMR) are designed specifically to address power loss during crane hoist lowering operations.
The LVMR continuously monitors bus voltage and de-energises the UV relay if the bus voltage falls below a value that will safely operate contactors and relays.
The LVMR distinguishes the difference between main power and regeneration power produced by a motor. It constantly monitors the DC bus voltage and sets the series brake automatically when it detects a power loss condition. When the voltage drops below the point where relays or contactors can reliably pick up and seal (as defined by the current NEMA standards), the crane hoist control panel will shut down and set the crane brake.
Heavy-Duty Mill
DC Relays
Designed for heavy industry service and are suitable for use on industrial cranes & other moving machinery. They are arranged for steel panel mounting with front connections.
Unit circuit blocks have two captive mounting screws and are interchangeable between relays. They are easily convertible from normally open to normally closed or vice versa. Contacts are of double break design.
Magnetic Overload
DC Relays
These overload relays are designed for use on DC power circuits to monitor crane motor loading.
Inverse time limit trip relays are normally set to trip between 125% and 175% of full load motor current. Instantaneous trip type overload relays use a dry type dashpot and are normally set to trip between 200% and 300% of full load motor current.
Field Control
DC Relays
This family of motor field control relays consists of a relay with 1NO pole and a relay with 1NC pole.
The opening and closing of the contact changes based on the amount of current going through the coil. The relays are equipped with one or two coils, depending on the application. When the relays leave the factory, they are adjusted for average load conditions.
Heavy-Duty Mill DC Relays - Type KC
The Type KC line of control relays complements the mill-type, front-connected DC contactors (Bulletin 7400, Type K). Each device is completely assembled and ready for mounting on metal panels without additional insulators or special hardware.
These DC Mill type relays are designed for heavy industry service and are suitable for use on industrial cranes and moving machinery. They are arranged for steel panel mounting with front connections. Unit circuit blocks have two captive mounting screws and are interchangeable between relays. They are easily converted from normally open to normally closed or vice versa. Visible contacts are of double break design.
Features
- Contacts are easily converted from NO to NC & vice versa.
- Contact blocks feature wear-resistant nylon guides & stainless steel springs
- Retained knife-edge design for reliable alignment
- Contacts rated 15 amperes continuous
- No adjustments to maintain — spring and air gap are fixed
- Encapsulated coils feature pressure type saddle terminals
- Basic relays are available with 2, 4, 6 or 8 contacts
- All relays in the line have same mounting dimensions
