Yaskawa GPD 506/P5 Section One - Manual (Page 33)

PP.P5G5.01.Troubleshoot
Page 33
Rev. 06/11/2003
Output Transistors
The output transistors are used to switch the DC bus voltage to allow current to
flow to the motor. Think of them as switches that turn on and off very quickly to
supply power to the motor. Large capacity inverters use the single pair style
transistors while the smaller capacity inverters use the 6-in-1 style transistor
module. In the single pair transistor, one transistor switches positive DC voltage
to the motor, while the other transistor switches negative DC voltage to the motor.
The terminals labeled T1, T2, and T3 are the leads that go out to the motor.