Bonitron Overvoltage Solutions

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The need for regenerated voltage control occurs in applications where the speed of the AC motor exceeds that of its variable frequency drive (VFD). In these cases, the motor acts as a generator. The energy generated by the motor must be dissipated as heat or returned to the power line. If this energy is not controlled, the drive may trip on an overvoltage condition, the energy may be dissipated as heat in the motor, or the motor may run with an excessively high Volt/Hertz ratio. Either situation can cause extensive damage to the costly motors and result in loss of materials and stops in production.

Transistors
Resistors
Combo Units
Line Regeneration
DC Motor Field Protector
Dynamic Braking for Servo Drives

Bonitron Braking Transistors are used with AC drives to allow full power braking and eliminate overvoltage faults. This permits controlled braking and dramatically shortens motor stopping time. Our transistors monitor the DC bus, and if overvoltage occurs, the Bonitron Transistor shunts the excess energy through a resistive load bank to prevent overvoltage faults. Click "Resistors" above to learn more about Bonitron Resistive Load Banks.
	M3452 Heavy Duty Braking Transistor
	Up to 1600A / 2300hp per unit Master / Slave capability Up to 100% duty Communication Options Ethernet IP, Profibus DP, Extended I/O
	M3575T Standard Duty Braking Transistor
	Up to 600A / 600HP Up to 20% duty Ideal for drives with no internal brake or 7th IGBT
	M3675T Low HP Braking Transistor
	Up to 10A / 10HP Up to 20% duty Ideal for drives with no internal brake or 7th IGBT

Whether you're buying a reputable Bonitron Transistor or using your drives' internal brake, there's no need to go anywhere other than Bonitron - we're your one stop shop! Below is our selection of resistors rated up to the megawatts. Need a custom resistor? We do those too!
	M3775R Resistive Load Banks
	Up to MegaWatts Standard 10%, 50%, and 100% continuous duty selection Custom resistors available Convection or fan cooled options Fan cooled units offer maximum wattage dissipation with a minimal footprint
	M3575R Standard Duty Braking Resistor
	Up to 33hp Up to 20% duty Vertically mountable

	M3452 Complete Braking Kit	Like separate transistor and resistor options, the M3452 Complete Braking Kit works with VFDs to monitor the DC bus. If overvoltage occurs, the M3452 Complete Braking Kit shunts the excess energy through an internal braking resistor to prevent overvoltage faults. Since the resistor is already installed internally, installation time is reduced, while production uptime is increased.
	Up to 43hp Up to 20% duty Convenient enclosure Quick installation

M3345 Line Regeneration Module

The M3345 Line Regeneration Module is ideal for applications with extended braking times or where frequent regeneration occurs. If an overvoltage condition occurs, the M3345 returns regenerative energy back to the AC line. This method produces much less heat than a typical transistor/resistor solution and has a much smaller footprint. Substantial energy savings result as the regenerated energy can now be used to power other equipment and the cooling requirements for the control room are reduced.

Two enclosure style options allow the versitility of a small footprint, integratable Type-1 or more environment protection in a Type-13.

Prevent overvoltage faults
Up to 120A per unit
Up to 100% continuous duty
Type-1 or Type-13 enclosure
Quick installation

M3539 Bi-Directional DC Motor Field Protector

The M3539 protects devices connected to the DC bus. If the DC bus voltage reaches a predetermined point, such as 1500VDC, the M3539 SCRs will limit the voltage from going any higher and shunt the energy through the field resistance.

Once the current drops below the M3539 SCR threshold, the unit turns off and prepares for the next spike. Multiple SCRs allow parallel load resistor connections.

Up to 1500VDC / Up to 1800A
Simple integration
Protect devices connected to the DC bus from high DC bus voltage

	M3500DB Dynamic Safety Brake	The standard M3500DB provides resistive E-stop braking control for servo motion systems and conforms to category II safety requirements per EN-954. The M3500DB4 incorporates redundant, positive guided contactors to satisfy category IV safety requirements per EN-954. The M3500DB is the secondary brake and will stop the motor in case of motion controller or power failure, as well as isolate the motor from its power source once it is stopped to ensure personal safety.
	Up to 150A Increased safety - EN-954 Class I or II For servo motion control systems Simple installation

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