WorkHorse H-ADCP Operation Manual
May
2015
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Page 7
Power Overview
H-ADCP re20 to 50 VDC to operate. The AC Adapter runs on any standard AC power and sup-
plies +48 VDC to run the H-ADCP.
Transmitted power increases or decreases depending on the input voltage (within the voltage range of 20
to 50 VDC).
The transmitted power is decreased approximately 1 DB if the input voltage drops from 42 VDC
to 33 VDC. For a 300 kHz H-ADCP, each DB will result in a decrease in range of one default depth
cell.
Power on Cycle
The power supply must be able to handle the inrush current as well. Inrush current is the current required
to fully charge up the capacitors when power is applied to the H-ADCP.
The capacitors provide a store of
energy for use during transmit.
The inrush current is as high as 3 Amps rms.
The H-ADCP will draw this
amperage until its capacitors are fully charged.
If the power supply limits the current or
the power drop on the cable is significant
, then the power on
cycle will take longer.
It can take up to one minute.
You do not want the power to shut down during the
inrush current draw, as this may not allow the H-ADCP electronics to start.
AC Power Adapter
The AC power adapter is designed to maintain a 400-ma supply under the H-ADCP’s inrush current. The
adapters are 75-Watt supplies, with 48 VDC, 1.5 amp outputs. They will not fall back to 0 amps, 0 volts
under a load. Customer provided power supplies might shut themselves down under such a load; when
that occurs, the H-ADCP will not wakeup.
Figure 3.
AC Power Adapter