DC Power Technologies FS3 Version 3 - Technical Hardware Manual - Manual (Page 22)

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Up to two copper current measuring shunts are fitted in the DC
output line, with current sense PCBs fitted to each shunt to allow
sensing by the MPC.
FS5 and FS9H models: single bus bar, current shunt and DC
output connector.
FS9L models: dual bus bars, current shunts and DC output
connectors.
The FS5/9 Auxiliary PSU provides a nominal 54VDC. This is
supplied to the backplane via J4 enabling module-MPC
communications, and from J8 on the backplane via an RJ45 cable,
providing a power supply to the MPC.
MPC Controller Circuitry
With the exception of current sensing in FS5 & 9 models, charger-
MPC interconnections are fundamentally the same for all models of
MPC and charger.
The MPC has a number of connections on the main board to allow
control and monitoring functions. Digital signals to and from the
charger modules are via the RJ45 cable connected at J101.
Charger module shutdown control (RSD) is also via the RJ45
communications cable.
The Auxiliary power supply is fed to the MPC from the backplane
via J102 and J109. The large front panel mounted LEDs are
connected to J109 and the rocker switch input signals to J102.
A 10-way ribbon cable provides connectivity for the charger front
panel display, LEDs and push buttons, as well as USB
communications with a connected PC.
A communications transformer is fitted to the output circuit of the
FSx range and connects to J103, allowing communication with a
battery module (if fitted).
The MPC also features six available relay contacts to provide
switching for external functions such as auto watering systems.