LMC™ Crane Controls
Digital Control of Bridge and Trolley DC Motors

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LMC™ Crane Controls for bridge and trolley motions generate more torque at startup and low-to-medium speeds than all other types of DC motor controls. Microprocessor-driven IGBT's (isolated-gate bi-polar transistors) control DC series-wound motors from 200 through 600 volts DC. LMC™ microprocessor digital logic delivers precise, repeatable control of bridge and trolley motions and includes features for communicating with other systems.

Microprocessor-Driven IGBT Performance

Cableform's proprietary microprocessor control of IGBT power semi-conductors delivers an almost ideal DM to LMC™-powered cranes. High-frequency 2kHz to 10kHz operation eliminates motor compatibility problems, reduces heat losses in motor and delivers fine control at all speeds. Microprocessor-control also eliminates contactor problems and brings programmable operating features and computer diagnostics to the operation of DC cranes.

Motor Speed

LMC™ technology eliminates the speed/torque problems associated with magnetic controls and AC/DC-phase controls. Magnetic controls limit motor speed by inserting resistance to reduce motor voltage (speed), which also reduces current (torque). The result is a substantial loss of torque in the low-to-medium speed range. AC/DC phase-controls limit voltage (speed) with SCR phase-switching, which also reduces current (torque). Load starting capacity is limited by the reduced motor currents and makes fine speed-control difficult from start through 30% of full speed. LMC™ controls supply current to boost torque to 100% of a motor's capability, which produces maximum load starting and fine control at all speeds.

Easy Intallation for Retrofits

• Install one standard NEMA control cabinet per motion
• Connect existing power cables
• Connect existing motor cables
• Connect existing brake cables
• Connect existing operator controls
• Fine Tune acceleration ramps, speed points and braking

Torque Boost-7:1 Current-Multiplication

LMC™ controls increase torque and reduce electric power consumption by supplying motors with high currents (torque) at low voltages (speed). Short IGBT pulses (2000-10000/second) plus the application of flywheel-diode currents maintain almost constant motor currents during the off portion of each pulse cycle. The result is up to seven amps generated in a motor for every one amp drawn from the power source - high currents at low motor voltages. Seven-to-one current multiplication produces 100% of a motor's toque capability at startup and across the entire speed range.

LMC™ Advantages for Bridge and Trolley Motions

• Programmable variable speed-control
• Optional programmable multi-step control
• Maximum motor torque at startup and across the entire speed range
• Smooth load starting
• Programmable smooth ramp-up from start to full speed
• Programmable smooth deceleration to creep-speed and stop
• Fine speed control
• Minimized load swing
• Easy load spotting

LMC™ Maintenance Advantages

• Elimination of contactor problems
• Motor protection circuits
• Elimination of motor in-rush currents
• Undervoltage protection
• Reduced demand on collector bars
• Reduced demand on power centers
• Reduced mechanical stress
• Elimination of voltage transients caused by magnetic controls
• Computer diagnostics
• Increased reliability
• Easily accessible compact size, less than one-third the size of other controls
• No external cooling required
• Built for harsh operating environments

Engineered Benefits

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Smooth Dynamic Braking

Short, 25-microsecond on-pulses dramatically reduce current surges to the armature during braking. This decreases the motor commutator wear and produces a smooth braking action.

Energy Efficient

LMC™ controls consume less energy and generate less heat than other types of crane controls. Example: a magnetic control operating at half speed and providing 200 amps to a motor dissipates 20,000 watts - under the same conditions the LMC™ control dissipates only 200 watts.

Holding-Brake Coordination

LMC™ Crane Controls work with shunt-wound and series brakes.

Solid-State Contactor Drivers

The opening and closing of motor-reversing and dynamic-breaking contactors is controlled by the LMC™'s microprocessor. This increases contactor life because they never make or break under load - no tip problems. LMC™ solid-state operation eliminates the remaining speed-control contactors and resistors found in magnetic controls. Maintenance is reduced.

Motor Compatibility

Low-inductance motors behave like high-inductance motors under the LMC™'s high-switching frequencies. This eliminates motor compatibility problems.

Fast Response

Protection circuits detect and respond to any motor or control fault condition in an instantaneous 25 microseconds.

Easily Interfaced Operator Controls

LMC™ controls contain solid-state drivers which optically isolate operator control switches from high-voltage circuits. This allows the use of durable, low-voltage switches and increased operator safety.

DC Power Supplies for DC Motors

LMC™ Crane Controls are designed to operate on DC power sources. The controls can be fitted with an input rectifier for operation of DC motors from AC supplies. Standard LMC™ specifications for DC voltages apply.

LMC™ Technology Eliminates Problems Caused By

• Brownouts and discontinuity of the power supply
• Substantial negative ring of supply voltages
• Positive-going transients caused by switching off other machines

The Result

LMC™ technology produces simple, reliable power circuits. Trouble-shooting is simple. LMC™ controls are energy efficient. Contactors never make or break a load. They are built for use in an extensive range of old and new equipment. LMC™ Crane Controls are the maintenance and performance standard for installation on all DC cranes.

• Digital Control of series wound DC motors
• One-, two-, and four-motor controls
• For bridge and trolley motors

Engineered For Performance

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• Digital motor-control
• Programmable operating features
• Motor and control protection
• Computer diagnostics
• Optimum performance

Digital Logic

The microprocessor's digital logic executes commands as they are received from the cranes' operator controls. Digital logic then maintains the desired levels of performance while constantly monitoring and controlling all functions, voltages and currents. Digital control of DC motors delivers precise, repeatable control of bridge and trolley motions. Interfaces for options, including communication with other computers, are handled through RS232 and RS485 ports.

Data Terminal

The data terminal is used to customize equipment performance and for troubleshooting. The terminal's display menus provide rapid access to operating status, features, and diagnostics. The menus quickly lead through the reading and setting of all operating parameters. For example, drive and brake settings can be individually adjusted to produce the optimum levels of torque, speed and braking for each crane equipped with LMC™ controls. All LMC™ parameters can be easily reprogrammed should a cranes operating requirements change.

Maintenance

Fault-detection and safety circuits record any faults that may occur and protect motors from dangerous operating conditions. The data terminal displays the control's status, which provides for the fast diagnosis and repair of almost any problem. Operator controls for functions like forward/reverse and speed demand are also tested with the data terminal. Trouble-shooting is quick and easy with plain language diagnostics.

Performance

LMC™ controls bring advanced IGBT power technology to the operation of DC cranes. The LMC™ control provides reliable, energy-efficient performance while significantly reducing operating costs. The data terminal makes maintenance of the entire system a simple task. The technology built into LMC™ controls makes their performance outstanding.

Crane Travel (Bridge & Trolley) Control Numbering System

Examples:

TDC50-1B1S1-11
Duplex 50HP Travel drive with Blower and Single motor operation using HI-11 software.

TSC75-EB111-15
Simplex 75HP Travel drive installed in an enclosure with blower using HI-15 software.

Notes:

1. ‘E’ option; Supplied by Cableform as complete controller in an enclosure. Includes disconnect,
   fuse, etc.
   
   ‘P’ option; all drive components supplied, including contactors. Enclosure, panel, disconnect etc. supplied by customer.
   
   ‘1’ option; is the core kit only. Enclosure, panel, disconnect, contactors, etc. supplied by customer.
   
   
2. Fins are not available on controllers 50HP and under.
   
   
3. This option is only available on Duplex controllers. Simplex controllers enter a ‘1’ in part number.
   
   
4. This option is only available on Duplex controllers. Simplex controllers enter a ‘1’ here.
   
   
5. Custom software is available for most applications. Consult Cableform Inc. for available numbers in this column.
   
   
6. The only option available for ‘TSS’ Solid State Travel drives is Mounting style. The option numbering for all Solid State drives is -xBF11-. The ‘x’ indicates where to place the preferred mounting style option character.
   
   
7. High Ambient option is for contactor reversing controls only. Not available on solid state travel controls

Partial Product Range for DC Series-Wound Motors
For Bridge and Trolley Motions up to 600 volts

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Model	Motor Frame Size
LMC-HI-1000	606 & 804
LMC-HI-1010	608 & 806
LMC-HI-1030	610 & 808
LMC-HI-1035	312 & 810
LMC-HI-1000D	2 x 606 & 2 x 804
LMC-HI-1010D	2 x 608 & 2 x 806
LMC-HI-1030D	2 x 610 & 2 x 808
LMC-HI-1035D	2 x 612 & 2 x 810