Speed modulation is achieved by the use of “Inverter” control. To accomplish this, the incoming 3-phase AC supply
is converted to high voltage DC, incorporating smoothing/storage capacitors, and then switched by the Inverter,
utilizing 3-phase rectifiers, to give a simulated 3-phase AC supply of variable voltage and frequency to the
compressor motor.
2.4 Compressor Energy and Signal Flow
During normal operation, 3-phase power is required to be connected to the compressor at all times, even if it is not
running. Power is distributed through the following components to maintain compressor operation:
l
Silicon-Controlled Rectifier (SCR)
l
Soft Start Board
l
DC Capacitor Bus Bar Assembly
l
Inverter
l
Stator
l
High-Voltage (HV) DC-DC Converter
l
Backplane
l
Bearing Motor Compressor Controller (BMCC)
l
Serial Driver
l
Bearing Pulse Width Modulation (PWM) Amplifier
l
Compressor I/O Board
l
IGV
l
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 on page 39:
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.
Page 38 of 294 - M-SV-001-EN Rev. H 1/23/2023
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