Bonitron Overvoltage Solutions aid in preventing AC drive overvoltage faults.
Overvotlage, or regenerative voltage, occurs when the speed of the motor exceeds the set speed on the drive. This can happen in many circumstances, such as slowing or stopping a process by reducing drive speed, or in applications such as cranes or downhill conveyors where the process load constantly "pulls" the motor. When this happens the motor acts as a generator, causing the DC bus voltage to rise. This excess voltage must remain below the overvoltage trip point on the drive or the drive will "trip" on an overvoltage fault.
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.
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!
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.
Bonitron's signature solution, the Line Regen, continues to advance with two new series.
When variable speed drive systems are braking, they generate power that must be dissipated. If the excess energy is not dissipated, the drive system can lose control of the process due to an overvoltage trip, or must extend the braking time to keep from overpowering the drive.
Instead of dissipating the excess energy as heat in a resistor, a Line Regen returns this energy to the power grid efficiently, with minimal heat loss, allowing the entire braking system to be installed in the drive cabinet. This reduces installation footprint and facility cooling costs.
Multiple units can be added to cover higher current ratings (consult Bonitron for over two).
The M3345 Series has stood as the test of time and proven itself the Line Regeneration work horse for over two decades. Bonitron took the efficiency and reliability of the M3345 and improved it for its latest releases, the M3346 and M3645 Series.
M3345 Series Line Regens are currently still offered for legacy applications, however the increased features and benefits with the M3346 and M3645, make them the preferred solution.
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
Protect devices connected to the DC bus from high DC bus voltage
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
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