Simphoenix DL100 Series - Brake resistor selection

DL100 Series Universal Low-Power Inverter
Brake Resistor Selection 67
Appendix II: 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
Applicable
motor (KW)
Brake resistor
power (KW)
Brake
resistance
value (Ω)
Braking
torque (％)
DL100-2S0004
0.4
0.1
150
100
DL100-2S0007
0.75
0.1
100
100
DL100-2S0015
1.5
0.2
70
100
DL100-2S0022
2.2
0.2
50
100
DL100-2S0030
3.0
0.4
40
100
DL100-2S0040
4.0
0.4
35
100
DL100-4T0007
0.75
0.1
400
100
DL100-4T0015
1.5
0.2
300
100
DL100-4T0022
2.2
0.4
200
100
DL100-4T0040
4.0
0.5
125
100
The above configuration is to realize 100% braking torque, it’s necessary to
select value in actual use based on braking condition. In case of weak braking,
please reduce brake resistance properly and increase brake resistance power class
in proportion.
The brake resistance power is the estimated value in working
condition of brake resistance interval; when continuous working
time of brake resistance is longer (more than 5s), it’s necessary
to properly increase power class of brake resistance under the
condition of same resistance value.