1. Elevator Overvoltage Solutions
Bonitron continues to open doors for distributors, elevator control manufacturers, and contractors.
Line Regens are ideal in AC drive-driven elevator applications.

2. Elevator Overvoltage Solutions

3. Elevator Overvoltage Solutions
Article published by Elevator World Dec 2011
Elevator Drives, Power Quality and Energy Savings by Jonathan Bullick and Brad Wilkinson
“An AFE uses PWM with a high-carrier fre-quency, the switching losses are higher compared to the block-style commutation of the regen unit. The PWM iron losses in the AFE filter are also higher compared to those in similarly sized harmonic filters. AFE systems can only be connected to a balanced three-phase wye, center grounded electric system; delta-connected systems are not permissible.”
“A regenerative unit can be used in lieu of a braking resistor, and the regenerated power can be returned to the grid, where it is consumed by other building loads. Regen units are becoming increasingly popular, as they can dramatically increase system efficiency and lower the total cost of elevator ownership. Since the regen’s IGBTs switch the current into the line in a similar manner to the diodes in a six-pulse rectifier, a regen unit will have similar harmonic content during regen mode as a VFD.”

4. Elevator Overvoltage Solutions
Regen
Transistor/Resistor
Integrate into drive cabinet
99% efficient
Resistors too hot for flammable areas
Return on Investment
Some drives include transistor / 7th IGBT
Low duty resistors are cheap

5. Elevator Overvoltage Solutions
Regen
Transistor/Resistor
Integrate into drive cabinet
99% efficient
Resistors too hot for flammable areas
Return on Investment
Some drives include transistor / 7th IGBT
Low duty resistors are cheap
Bonitron Line Regens are a cost-effective solution for elevators.
One Elevator regenerative application saves 54% of the power used.
Bonitron Line Regens absorb excess energy from the drive and returns it to the ac power source.

6. Overvoltage Solutions
9/22/2018
Line Regen
Regenerative energy returned to AC line reduces utility power usage
Great return on investment
VAC support with 50/60Hz auto select
15, 30, 50, 100 Amp units
150% overload for 60 seconds
Digital Display with event and usage logging
Integrated filtering and transient suppression
> 99% efficient
Product Highlights
The Bonitron Line Regen takes the place of a braking transistor and resistor. Instead of dumping excess energy into a resistor, the Bonitron Line Regen returns that energy back to the AC line. This reduces room cooling requirements and has a smaller footprint. 6

7. Line Regen Selection

8. Overvoltage Solutions
Heat generated
Locate outside or adjust cooling
Added install cost (conduit, wiring, etc)
Transistor / Resistor
Return on Investment
Simple, low-cost install near drive
Line Regen
Regen efficiency
Large Transistor/Resistor for peak or surge power
Both
Resistor
Bonitron offers 3 methods to protect drives from Overvoltage faults:
Transistor and Resistor
Line Regen
Or Both
Transistor/Resistor (Dynamic Braking)
The dynamic brake method typically has a lower up front cost, but heat generated by resistors can increase cost two way. If the resistors are indoors, added cooling capacity may be required for the room. Large resistor banks may be kept outside, far from the drive, but this results in more wiring and conduit cost. Resistors also need time to cool down after a braking cycle. Regen units are rated for continuous use and so are typically a better choice for high duty applications such as cranes and hoists where utility power is used.
Line Regeneration
Line regen solutions have many advantages. First, because the unit does not generate high levels of heat (99% efficient), it can be integrated into the drive cabinet. Second, the unit can run continuously without the need of a cool down period. Third, the lack of heat generation allows its use in environments where there might be flammable materials such as feathers, dust, or wood. The regen also boost energy efficiency as it puts electricity back into the AC line where it can be used by other equipment, considerably reducing the demand from the utility.
Both
A regen is most effective for frequent or continuous braking up to 450A, while a transistor/resistor is more suited to higher peak loads for shorter durations. If necessary, transistor/resistor and regen units can be used together for a more efficient solution, where the regen handles continuous braking needs and the dynamic brake activates when the regens's capacity is surpassed.
Regen
Transistor

9. Current Customer
Uses the Bonitron M3645

10. Current Customer

11. Contact Info
Bonitron.com/contact.html
521 Fairground Ct.
Nashville, TN 37211
Charlie Adkins, P.E.
Vice President / Engineering
Keith Benson
President
Todd Edwards
Marketing Manager
Derek Lovett
Inside Sales
Michael Sadd
Business Development
Tim Smith
Sales Manager
Tommy Tyler
U.S. Distribution Manager
Tim Watkins
Technical Support

12. B NITRON Dedicated to Designing and Manufacturing
Quality Industrial Electronics