105
CHAPTER 8 - OPTIONS AND ACCESSORIES
In any case, the RMS current capacity and the maximum peak current
shall be respected.
The maximum peak current defines the minimum resistance value
(ohms) of the braking resistor. Refer to table 8.3.
The DC Link voltage level at which the rheostatic braking is activated
is the following:
CFW-10 200-240 V models: 366 Vdc
CFW-10 110-127 V models: 411 Vdc
The braking torque that can be achieved through the application of
frequency inverters, without using the rheostatic braking module, va-
ries from 10 % to 35 % of the motor rated torque.
During the deceleration, the kinetic energy of the load is regenerated
to the DC Link (intermediary circuitry). This regenerated energy
charges the capacitors at the intermediary circuitry increasing the
voltage level at the DC Link. In case this additional energy is not
dissipated, an overvoltage error (E01) may occur disabling the inver-
ter.
In order to have higher braking torques the rheostatic braking is
applied. When using the rheostatic braking, the additional regenerated
energy is dissipated in an external resistor. The braking resistor power
is a function of the deceleration time, the load inertia and the resistive
torque.
Use WIRE or RIBBON resistors in ceramic case with appropriated
insulation voltage to withstand a high instantaneous power (respecting
to the rated power).
8.4.1 Sizing
Table 8.3 - Recommended braking resistors
CFW -10
Model
V
max
(Maximum
Resistor
Voltage)
Maximum
Braking
Current
P
max
(Resistor
Peak
Power)
Maximum
RMS
Braking
Current
P
rms
(Resistor
Maximum
Power)
Recommended
Resistor
Recommended
Wiring
SINGLE-PHASE
1.6 A /
200-240 V
2.6 A /
200-240 V
4.0 A /
200-240 V
Braking not available
7.3 A /
200-240 V
410 V 11 A 4.3 kW 10 A 3.9 kW 39 (ohms)
2.5 mm² /
14 AWG
10.0 A /
200-240 V
410 V 11 A 4.3 kW 10 A 4.3 kW 39 (ohms)
2.5 mm² /
14 AWG
1.6 A /
110-127 V
2.6 A /
110-127 V
Braking not available
4.0 A /
110-127 V
460 V 12 A 5.4 kW 5 A 2.2 kW 39 (ohms)
2.5 mm² /
14 AWG
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