Brake System - Hitachi S1 Series Basic Manual

S1 series standard inverter

12.8 Brake system

12.8.1 Brake component selection
When an inverter driving a high-inertia load decelerates or needs to decelerate abruptly, the motor
runs in the power generation state and transmits the load-carrying energy to the DC circuit of the
inverter, causing the bus voltage of the inverter to rise. If the bus voltage exceeds a specific value, the
inverter reports an overvoltage fault. To prevent this from happening, you need to configure brake
components.
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Brake unit models
Inverter model
S1-00032SFE
S1-00055SFE
S1-00100SFE
S1-00130SFE
S1-00032HFE
S1-00055HFE
S1-00073HFE
S1-00125HFEF
S1-00170HFEF
S1-00250HFEF
The design, installation, commissioning, and operation of the device must be
performed by trained and qualified professionals.
Follow all the "Warning" instructions during the operation. Otherwise, major
physical injuries or property loss may be caused.
Only qualified electricians are allowed to perform the wiring. Otherwise,
damage to the inverter or brake components may be caused.
Read the brake resistor or unit instructions carefully before connecting them
to the inverter.
Connect brake resistors only to the terminals PB and (+), and brake units
only to the terminals (+) and (-). Do not connect them to other terminals.
Otherwise, damage to the brake circuit and inverter and fire may be caused.
Connect the brake components to the inverter according to the wiring
diagram. If the wiring is not properly performed, damage to the inverter or
other devices may be caused.
Resistance
applicable
Brake unit
model
torque (Ω)
Built-in brake unit
Dissipated
power of
brake
resistor
for 100%
(kW)
brake
10% brake
usage
361 0.06
192 0.11
96 0.23
65 0.33
653 0.11
326 0.23
222 0.33
122 0.6
89 0.75
65 1.1
-224-
Dissipated Dissipated
power of power of
brake brake
resistor resistor
(kW) (kW)
50% brake 80% brake
usage usage
0.30 0.48
0.56 0.90
1.10 1.80
1.70 2.64
0.56 0.90
1.13 1.80
1.65 2.64
3 4.8
4.1 6.6
5.6 9
Min.
allowable
brake
resistance
(Ω)
42
42
30
21
240
170
130
80
60
47