Brake Driver Circuit - Veichi AC310 Service Manual

2.2 Brake Driver Circuit

1. Circuit composition
Isolation photocoupler, transistor, voltage regulator
2. Fault type:
Overvoltage fault, braking resistor burned out, module damage 3, overhaul mode
Static detection
According to the appendix provides a variety of device detection methods for overhaul,
but also need to test the braking circuit of the brake diode is good or bad.
Dynamic detection
⚫ When the brake is not consumed, the control signal BRK voltage is 5V, and when the
brake is turned on, the BRK voltage point is 0.455 (the pulse voltage changes from 5V
to 0.455V).
Before braking, the voltage of GBRK and N point is zero, and when braking is on, the
voltage of GBRK and N point is about 16V. Use the oscilloscope to capture the graph
as follows: (Note: to turn on the energy consumption braking) Use the ripple probe to
connect to the brake tube driver (directly soldered to the IGBT pin), regulate the power
supply to the energy consumption braking point (the default is about 680VDC), and
observe whether the brake tube is turned on or not. CH2: Braking current CH4: Brake
AC310 Universal AC Drive Service Manual
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