Danfoss Turbocor TTS Series Service Manual page 35

• Bearing Pulse Width Modulation (PWM) Amplifier
• Compressor I/O Board
• IGV
• Solenoid actuators
The order of power and signal flow through the compressor components is as follows. Refer to "Figure
2-6 Compressor Energy and Signal Flow Connections":
1. A 3-phase voltage source is provided to the compressor through the voltage input terminal.
2. AC voltage enters the SCRs and DC voltage powers the DC bus.
3. The Soft Start Board limits the in-rush current at power-up by controlling the SCR gates.
4. DC bus voltage from the SCRs charges the capacitors.
5. DC bus provides DC voltage to Inverter.
6. The Inverter converts the DC bus voltage into a variable frequency, 3-phase simulated AC
voltage to the Stator.
7. The DC-DC Converter uses the DC bus voltage to provide 24VDC and 250VDC to the
Backplane.
8. The Backplane connects and supplies low DC voltage to the service side components.
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