62 of 132
M-SV-001-EN Rev.E
Compressor Components
3.9 High-Voltage DC/DC
Converter
3.9.1 Function
3.9.2 Connections
The HV DC/DC Converter provides the Backplane
with +24VDC (with respect to 0V) and HV+
(+250VDC with respect to HV-) for the Bearing
PWM Ampliļ¬er.
DC bus voltage (460-900VDC) is supplied to the
HV DC/DC converter through the Soft Start Board
F1 fuse. The Soft Start Board also powers the HV
DC/DC Converter with 15VAC when the DC bus
has reached minimum level.
See Figure 57 (DC/DC Converter Connections)
for the HV DC/DC Converter input-output (I/O)
connections:
Inputs:
1.J1 HV DC Bus
2. J4 15VAC
Outputs:
3. J2 250VDC
4. J3 24VDC
Figure 57 - DC/DC Converter
Connections
J3 J4
J1
J2
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