CenCon
21
WIRING CONCERNS
For purposes of unit wiring to chassis in this manual, grounding and bonding reference the same thing and may
be used interchangeably. Shielded cables always include a ground connection wire, uninsulated, called a
‘drain’ wire.
MODULE GROUNDING
The CenCon and all expansion modules have a black power connection termination that includes Hot (H),
Neutral (N), and Ground (GND). The GND terminal must be connected to a short green wire securely fastened
to unpainted metal directly below the termination of each and every expansion module.
As shown in the example below, the DJ speed sensor wire shield drain wire must connect to the same
unpainted ground connection used by the CD-XM input power. The communication wire ground should only
connect to the CenCon unpainted ground connection.
COMMUNICATION WIRING
m
NOTICE:
Correctly wiring the internal Modbus communication network is critical to ensuring stable operation.
Maintain the wiring at least 6” (150mm) away from any high power wiring, motors, transformers or VFD’s.
The CenCon communicates with expansion modules via an internal Modbus communication protocol. The (pink
jacket) wire is specific for Modbus communication: ASTM B33, Twisted pair, 22ga. fully shielded with drain
wire, and plenum rated jacket. An end of line resistor (EOL termination) should not be required due to the
relatively short length of the internal Modbus wiring. Care must be taken to ensure correct polarity between
modules.
m
NOTICE:
For consistency, always wire: Red to LmA Black to LmB.
Starting at the CenCon, wiring must be routed in series, or ‘daisy chained’ as shown below. There should never
be more than 2 communication wires at any LmA/LmB terminal.
