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DocuColor 12/DCCS50
Switched DC Power
Principles of Operation
Reissue
Switched DC Power
Switched DC Power comprises the outputs of the IDFE LVPS, IOT LVPS and the IIT/IPS LVPS.
IDFE Low Voltage Power Supply (IDFE LVPS)
As shown in Figure 1, the AC input power to the IDFE LVPS is supplied by Unswitched AC
Power through a Choke Coil and an SSR. The SSR is controlled by the IDFE LV SEQ from the
AC Driver PWBA; IDFE LV SEQ is controlled by the Main Power Switch. When switching off
machine power, an RC network on the AC Driver PWBA delays the change of state of IDFE LV
SEQ by approximately 22 seconds. This permits the IDFE to perform an orderly shutdown.
The IDFE LVPS has two outputs:
• +5.1 VDC at 11 amps
• +12 VDC at 2 amp
Figure 2 shows
t
he location of the IDFE LVPS.
Figure 1 IDFE LVPS AC Power Switching and DC Power Distribution
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