Operator Manual
Issue 1
TIL – Eng – Spec – 080
Page 38 of 70
SeaHub
5.3.5. Power Output Types
Refer to section 6.3 (page 40) for further details of all connector wiring, pin-outs and specific signals.
Sonar Power – “PWR”
The “PWR” power supply is intended to be used to power external devices such as Sonars, Acoustic
Modems or other connected sensors needing a high voltage (possibly to drive down long cables).
The “PWR” voltage depends on which Power input source is being used…
•
If using an AC “mains” power supply, the output voltage will be +28V (
±
5%), rated at 50W, with
overload protection.
•
If using a DC power supply, the output voltage will be approximately 1.5V less than the input
supply voltage. Current drawn from the output, when using a DC source should not exceed
2Amps.
The “PWR” supply outputs are internally fused with a standard 20mm
×
5mm 2A ‘Quickblow’ (F) cartridge
fuse – for replacement details, see section 7.2 (page 47).
DANGER!
When powering the SeaHub from an AC (“Mains”) source, the derived “PWR”
+28V(
±
5%) supply is not suitable for powering the Tritech PA altimeter, and hence
sensors such as Bathymetric units or Sonars using the PA altimeter on their
auxiliary port will need to use a DC power input between 20 and 28VDC.
CAUTION!
The “PWR” supply IS isolated from the AC “mains” source, but NOT from the DC
supply source, however “PWR” is isolated from the “EXT” (+12V, +5V) and “COMM”
supplies.
CAUTION!
The output voltage available on ports using this supply (4mm DC output sockets, or
ports “C” and “D”), will change depending on the power supply source used (AC or
DC).
CAUTION!
Power from this source may be shared across ports “C” and “D”, the 4mm DC
Output sockets (if configured as such), and the “AIF (ARCNET)” connector.
The ratings stated apply to the total load from all outputs of the SeaHub.
External Power – “EXT”
The “EXT” power supply is intended for powering external medium power devices (>1W load) that require
a reg12V or +5V level.
The “EXT” voltage is selected by internal jumpers within the SeaHub unit (section 7.2). The positive
voltage may be selected from…
•
+12V with respect to GROUND (Fused internally at 2A)
•
+5V with respect to GROUND (Fused internally at 2A)
The “EXT” supply outputs are internally fused with 2A quick blow fuses – for replacement details, see
section 7.2 (page 47).
NOTE
The external power supply is isolated from both the incoming AC/DC source
(“PWR”) and the communications supply (“COMM”).
NOTE
Using this supply to power un-isolated external devices with communications to the
SeaHub, will require that the isolation barrier between the internal (“EXT”) supply
and the communications (“COMM”) supply is bridged – see section 7.3.
