User’s Manual
9
2. PRODUCT DESCRIPTION
Bonitron M3452 heavy duty 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.
The M3452 works with variable frequency drives (with DC bus connections) to monitor the
DC bus. If overvoltage occurs, the M3452 shunts the excess energy through an external
braking resistor to prevent overvoltage faults.
During motor braking or deceleration, the frequency of an AC motor is higher than the
connected variable frequency drive. In this case, the motor acts as a generator. This
power returns to the DC bus of the drive, causing the voltage to rise. If this energy is not
controlled, the motor may run with high peak voltages, the energy may be dissipated as
heat in the motor, or the drive may trip on an over-voltage condition.
The R8 option allows for braking kit monitoring and control over a remote I/O network or
with discrete I/O. Extensive fault monitoring and chopper operation can be controlled over
the network, and critical functions can be controlled or monitored discretely. Master/Slave
operation can be changed on the fly for multiple-module systems to allow for redundancy
in the power sections for critical applications or quick reconfiguration. Remote
temperature monitoring can be used to allow for maximum production. Remote discharge
can also be used to bring the DC bus of a system down during shutdowns for quick
maintenance. Remote setpoint adjustment can be used to tailor braking thresholds for
energy efficiency and process control. Other parameters can also be monitored, including
bus voltage and duty cycle, along with a history of faults.
2.1. RELATED PRODUCTS
The M3452 series is one of several overvoltage solutions offered by Bonitron. Below
are a few related products, including braking resistors that are used in conjunction with
the M3452 series.
BRAKING TRANSISTORS
Like the M3452 heavy duty braking transistors, Bonitron M3575T and M3675T
standard duty braking transistors work with variable frequency drives (with DC
bus connections) to monitor the DC bus. If overvoltage occurs, the M3575T or
M3675T shunts the excess energy through an external braking resistor to
prevent overvoltage faults. The M3575T series is rated up to 600A peak / 20%
duty, while the M3675T series is rated up to 10A peak / 20% duty.
BRAKING RESISTORS
Bonitron offers resistor solutions to complement its braking transistor selection.
The M3575R series is rated up to 32 A peak / 20% duty, while the M3775R series
is rated up to 1600 A / 100% duty. Custom resistors are also available.
LINE REGENERATION
Bonitron is famous for its industry-leading line regeneration solutions. The
Bonitron M3645 line regen returns regenerative energy back onto the AC line
instead of dissipating the energy as heat in a resistor, and is ideal for applications
with high duty cycles, frequent deceleration, or where heat from a resistor may
be an issue. The M3645 line regen features an interactive digital display with
event logging.
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