5. Substation AC
The Substation provides three DC voltages to the Overdrive, +12VDC, +18VDC and –
18VDC. In standby mode, all voltages are powered in the Substation AC, but there is no
DC output. The three red LEDs should be on when the power cord is attached. The
Substation AC provides power sequencing to the Overdrive SE, so it should always be
powered using the front panel switch.
Danger: never connect the Umbilical to the Overdrive with the Substation power
on.
5.1. Substation Front Panel
The red LED indicators are:
top +12VDC
Middle –18VDC
Bottom +18VDC
