Rockwell Automation 1395 Digital DC Drive FRN 5-10.10/9.30 User Manual
Page 55
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Chapter 3
Hardware Description
40 – 100 HP, 230VAC
75 – 200 HP, 460VAC
3-15
DC Control Voltage Distribution – The Unit Power Supply converts
115VAC (supplied as shown in Figure 3.13) to +5VDC and the +/–12VDC
control voltages. In addition to the voltages supplied by the Unit Power
Supply, the Power Stage Interface converts the 20VAC coming from the
control transformer 1 PT to 24VDC which is used for relay logic, including
the ECoast, Pilot Relay, and Fault/No Fault Logic. It also provides the
supply voltage to the SCR Pulse Transformer and Snubber boards to
produce SCR gate signals for the armature and field.
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