MODBUS Protocol 92
Appendix III: Brake resistor selection
In running process of inverter, in case that controlled motor speed falls too fast
or motor load shakes too fast, the electromotive force will charge inverter internal
capacitance through inverter in reverse direction, therefore, voltage at two ends
of power module will be boosted to damage inverter possibly. The inverter
internal control will be suppressed based on loading condition; in case of brake
performance failing to meet customer requirements, it’s necessary to connect
with external brake resistor to realize immediate release of energy. The external
brake resistor belongs to energy-consumption brake mode, which will consume
all energy on power brake resistor. Therefore, selection of power and resistance
value of brake resistor must be reasonable. The following content refers to
introducing brake resistor power and resistance value recommended to be
employed for SUNFAR inverter. Based on loading condition, user can modify
value properly in line with the range specified by SUNFAR inverter.
Inverter
model
E550-2S0004
E550-2S0007
E550-2S0015
E550-2S0022
E550-2S0030
E550-2S0040
E550-4T0007
E550-4T0015
E550-4T0022
E550-4T0030
E550-4T0040
Applicable
motor (KW)
0.4
0.75
1.5
2.2
3.0
4.0
0.75
1.5
2.2
3.0
4.0
Brake resistor
power (KW)
0.1
0.1
0.2
0.2
0.4
0.4
0.1
0.2
0.4
0.4
0.5
Brake
resistance
value (Ω)
150
100
70
50
40
35
400
300
200
150
125
Braking
torque (％)
100
100
100
100
100
100
100
100
100
100
100
E550 Series Universal Low-Power Inverter
