Astraada DRV-24 frequency inverters Appendix C
125
Note:
1. The input EMI meet the requirement of C2 after adding input filters.
2. Above options are external, the customer should indicate when purchasing.
C.7 Braking components
C.7.1 Select the braking components
It is appropriate to use braking resistor or braking unit when the motor brakes sharply or the motor
is driven by a high inertia load. The motor will become a generator if its actual rotating speed is
higher than the corresponding speed of the reference frequency. As a result, the inertial energy of
the motor and load return to the inverter to charge the capacitors in the main DC circuit. When the
voltage increases to the limit, damage may occur to the inverter. It is necessary to apply braking
unit/resistor to avoid this accident happens.
Only qualified electricians are allowed to design, install, commission
and operate on the inverter.
Follow the instructions in “warning” during working. Physical injury
or death or serious property may occur.
Only qualified electricians are allowed to wire. Damage to the
inverter or braking options and part may occur. Read carefully the
instructions of braking resistors or units before connecting them
with the inverter.
Do not connect the braking resistor with other terminals except for
PB and (-). Do not connect the braking unit with other terminals
except for (+) and (-).Damage to the inverter or braking circuit or fire
may occur.
Connect the braking resistor or braking unit with the inverter
according to the diagram. Incorrect wiring may cause damage to the
inverter or other devices.
Astraada DRV-24 series inverters have internal braking units.
Braking
resistor at
100% of
the
braking
torque (Ω)
The consumed power of the braking
resistor
Min.
braking
resistor
(Ω)
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