Class1 ES-Key-USM - Manual (Page 10)

10
Power Modules
The ES-Key System uses Power Distribution Modules (PDM’s) to supply current to electrical
loads. Currently these are available in two basic styles and there can be up to 16 of them in
the system.
Relay Modules use standard 30/40 Amp automotive relays and are available in 8 and 12 relay
configurations. Both relay boards have two relays that the common terminal can be set to
discrete inputs. The power to the board must be OFF any time that the switch for these
outputs is changed. The rest are common bussed to system voltage. Both boards have eight
inputs, 4 of which are polarity selectable and the other 4 are ground inputs. Each output has
a feedback circuit to identify to the system it’s current status (OFF or ON). If an output is
supposed to be on, but has no feedback, a fault is generated that can be easily traced.
Whenever a PDM is installed or replaced, it is essential that the address switch be positioned
correctly for it’s function in the system. Each load is turned on by device type, address and
port. Relay #1 on relay board #1 would be addressed as PDM #1, Port #1 and most likely be
named for the load that is connected to it. Any PDM whose address switch is at number 1 will
respond to a turn on or off command unless there is an address conflict.
Connector Information
Amp Mini Universal Mate-N-Lok
Power Amp 172165-1 1) Power 2) Ground
CAN Amp 172166-1 1) Can HI 2) CAN LO 3) CAN Shield
Input Amp 770579-1 1) Input 0 select 5) Input 4 ground
2) Input 1 select 6) Input 5 ground
3) Input 2 select 7) Input 6 ground
4) Input 3 select 8) Input 7 ground
Amp Socket Terminals
Tin 101535
Gold 103374
4 3 2 1
8 7 6 5