60 SUNFAR E300 SERIES
Appendix Ⅲ: BRAKING RESISTOR
During inverter running, if speed of controlled motor decreases too fast or shock of motor load
too fast, its feedback energy may generate power into inverter capacitance that would cause
damage of inverter itself. Inverter inner control will restrict based on load. If braking performance
can not reach requirement, it needs external braking resistor to achieve energy release in time.
External braking resistor as energy consuming mode would consume for power braking resistor.
If so, power of braking resistor should select suitably. Below is SUNFAR recommended braking
resistor power and resistor value. Based on load situation, user can select suitable value for
SUNFAR inverter requirement.
Inverter
model
Applied motor
（KW）
Braking resistor
power（KW）
Braking resistor
value（Ω）
Braking
torque（％）
E300-2S0002
0.2 0.1 250 100
E300-2S0004 0.4 0.1 150 100
E300-2S0007 0.75 0.1 100 100
E300-2S0015 1.5 0.2 70 100
E300-2S0022
2.2 0.4 50 100
E300-4T0007 0.75 0.1 400 100
E300-4T0015 1.5 0.2 300 100
E300-4T0022
2.2 0.4 200 100
E300-4T0037
3.7 0.6 125 100
Above recommendation is for 100% braking torque. If braking is not visible, please decrease
braking resistor and increase braking resistor power class.
Braking resistor power is estimated value during braking resistor interval
running situation. When braking resistor lasts long time work (above 5S), it
should increase braking resistor power class properly under same resistor
value.
E300 Series Mini-type Integrated Universal Inverter Manual
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