bonitron M3575T, Customer Reference Manual

Page: 9 / 44

User’s Manual
9
2.
P
RODUCT
D
ESCRIPTION
The need for regenerated voltage control occurs in applications where the frequency of
an AC motor at times exceeds that of its adjustable speed drive. In this case, 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 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.
For applications where this condition occurs infrequently, dissipating the energy as heat
through resistive braking control can be the most cost-effective solution.
2.1.
R
ELATED
P
RODUCTS
The model M3575T series of braking products is designed to provide resistive braking
control for applications utilizing a standard AC drive with a fixed DC bus. These
modules have been designed for use with remotely mounted resistive loads such as
the model M3575R or M3775RK resistive load modules.
For higher duty cycle applications, consider the M3452 series of braking transistor
modules.
2.2.
P
ART
N
UMBER
B
REAKDOWN
Figure 2-1: Example of M3575T Part Number Breakdown
B
ASE
M
ODEL
N
UMBER
The Base Model Number M3575T indicates that the unit incorporates the braking
transistor and its control circuitry only. An external resistive load is required for proper
function of the braking module.
AC V
OLTAGE
R
ATING
The AC voltage rating of the braking unit should match the input AC line voltage to the
AC drive used with the braking module. This rating is represented by a letter code as
shown in Table 2-1.
Table 2-1: AC Voltage Rating Codes
AC V
OLTAGE
R
ATING
C
ODE
AC V
OLTAGE
N
OMINAL
AC L
INE
DC B
US
T
RIGGER
L
EVEL
L 230VAC 375VDC
E 400VAC 620VDC
H 460VAC 750VDC
B
A S E
M
O D E L
N
U M B E R
AC V
O L T A G E
R
A T I N G
DC C
U R R E N T
R
A T I N G
S
P E C I A L
O
P T I O N S
M3575T H 200 Nxxx