User Manual

Page 16 of 57
Document Reference Phalcon-NT11, Issue 2 and Date 24/10/18
THIS IS THE PROPERTY OF Pharos Marine Automatic Power. DISCLOSURE OR REPRODUCTION IS FORBIDDEN UNLESS AUTHORISED
Registered Address: 14 Castle Mews, Hampton, England, TW12 2NP Company Reg. No. 06757705 VAT Reg. No. GB222645483
As the manufacturer of the equipment, Pharos Marine Automatic Power, do not know the specifics of each
installation site and so the supply of the fixing and any other parts required are left to the customer’s discretion
however a clear line of sight to intended radars is necessary for correct operation.
Note: A low impedance (<20mΩ) connection capable of carrying 20A to earth is necessary to the Lightning Ground
Connector (See page 5. Connection E) to meet the surge protection specification.
See Appendix A for mechanical details.
Electrical Connection
The Transponder is intended to operate from a single DC power supply of between +10V and +36V via an Amphenol
connector. The source impedance of the DC supply applied to the Transponder must be less than 1 Ohms.
Information on the fitted connector type and connections to the Transponder can be found in Appendix B and the
Block Diagram above. The alternate mating half of the connector is required for the external power cable.
Correct choice of wire gauge for the cabling is left to the customer but must be sufficient to supply the required 10V
to 36V DC, with a nominal peak current up to 2A, at the terminals to the device and be appropriate for the external
operating environment. For reference the internal wiring to the main power connector is made up of three parallel
26AWG wires, made of 7 strands 34AWG tinned copper wire, with a voltage rating of 300V and with PVC Insulation.
It may be necessary to consider a larger gauge than this for long cable runs to the transponder device where the
voltage drop across the supply cable may drop the applied voltage below the 10V minimum requirement for correct
operation.
A fuse rated in excess of 2A but less than 3A fitted in series with the positive voltage connection wires is
recommended for additional fault protection purposes and should be used in all battery based applications.
In order to meet conducted emissions requirements of BS EN60945, through the power cables, the floor of the
transponder must be situated more than 25mm away from a ground plane if other electronic equipment is
connected to the common supply.
Connection process
The two circular cable connectors are designed to be fitted by hand. This is done by grasping the connector firmly,
aligning the outer connector to match the alignment pins on the mating half in the housing and then pressing
towards the body of the transponder whilst twisting the outer body of the connector clockwise until the connector
mates with the mating half fitted to the transponder housing. The connector incorporates a sprung locking
mechanism to maintain connection once correctly mated.