Standard Braking Resistors - gefran BUy-1020 Manuel D'utilisation

In order to simplify the choice of the braking resistor to be used, here following is a list of the
normalized resistor values, which have been calculated according to a typical application
principle.
P Overload power that can be regenerated by the inverter; it is equal to
OVL
the rated power multiplied by the factor 1.36 (inverter overload = I
1.36). ADV200 series heavy duty overload 150%.
Average power to be dissipated by the resistor according to a typical
P
AVBR
duty cycle equal to 6.5%
Duty cycle see chapter 3.
max
E Maximum instant energy to be dissipated by the resistor
BR
t Maximum continuous braking time in overload condition (P
OVLBR
Maximum continuous braking time in rated load condition
t
BR
P Resistor rated continuous power which must be equal or higher than
NBR
the P
P,n
P
PBR
n
The ohmic value of the normalized resistors has been calculated in order to assure a braking
current based on the BUy maximum use:
- BUy-1020, 1050, 1085: 480Vac inverter power supply, braking threshold 775Vdc
- BUy-1065-6: 690Vac inverter power supply, braking threshold 1150Vdc
- BUy-1075-5: 575Vac inverter power supply, braking threshold 965Vdc

6. Standard Braking Resistors

average power.
AVBR
T
BR
—————— Braking Unit ——————
E
BR
T
C
x
cont
)
OVL
t
64-GB