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38 Start-up
Tasks
Make sure that the supply unit is stopped, and the drive system has been isolated from the
supply network.
Powering up the DC bus
Make sure that all cabinet doors are closed.
Close the disconnector of the supply transformer.
Close the drive auxiliary voltage switch [Q21] to power up the control units.
Start the supply unit. See the supply unit hardware manual. When started, the supply unit charges
the capacitors of all inverters and brake units connected to the DC bus.
In all inverter units, disable the overvoltage control (30.30).
Connect a Drive composer PC tool to an inverter unit that is suitable for the brake chopper
testing (ie. it runs a high inertia motor that generates power to the drive when decelerated).
Tune a suitable deceleration time setting (23.13) for the motor: make it short enough to cause
generation back to the drive and start the brake chopper. Do not make it too short not to exceed
the capacity of the brake chopper and resistor.
Operational tests
Test the operation of the braking. Start the test inverter and motor, accelerate and decelerate.
During the deceleration, monitor the drive DC bus voltage (with the Drive composer PC tool)
and the brake chopper. Make sure that the brake chopper starts when the DC link voltage exceeds
the brake operation limit.
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