DRV-28 inverter
s Optional peripheral accessories
-332-
D.8 Brake system
D.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.
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.
D.8.1.1 Brake units for AC 3PH 400V (-20%)
–440V (+10%)
DRV-28 series inverters of 400V, 37 kW or lower are equipped with built-in brake units, and those of
400V, 45 kW or higher need to be configured with external brake units. Inverters of 45 kW to 110 kW
can be configured with optional built-in brake units, and after a built-in brake unit is configured, the
inverter model is added with a suffix "-B". Select brake resistors according to the specific
requirements (such as the brake torque and brake usage requirements) on site.
Inverter model
Brake unit
model
Resistance
applicable
for 100%
brake
torque (Ω)
Dissipated
power of
brake
resistor
(kW)
Dissipated
power of
brake
resistor
(kW)
Dissipated
power of
brake
resistor
(kW)
Min.
allowable
brake
resistance
(Ω)
10% brake
usage
50% brake
usage
80% brake
usage
AS28DRV41C5
Built-in brake unit
326
0.23
1.1
1.8
170
AS28DRV42C2
222
0.33
1.7
2.6
130
AS28DRV44C0
122
0.6
3
4.8
80
AS28DRV45C5
89
0.75
4.1
6.6
60
AS28DRV47C5
65
1.1
5.6
9
47
