COMTRAXX® CP305 - Control Panel
PELV
If a DC power supply unit is used to supply one or more CP305 devices, A2/- can be connected to
protective earth. Then shielded Ethernet cables can also be used.
SELV
If an AC or DC power supply without a secondary connection between A2/- and protective earth
is used to supply one or more CP305 devices, unshielded Ethernet cables must be used.
Notes on the connection
Supply voltage
u
Connect the CP305 devices to the supply voltage (terminals A1/+, A2/–).
•
DC 24 V: Take the line voltage drop into account if you are using long supply cables for
the supply voltage. Consider the maximum permissible cable lengths for the supply
voltage (A1/+, A2/–) (see “Technical data”).
Ethernet
u
The currently configured IP address can be read out in the device under > Info. The IP
address for a 1:1 connection is unique for each device and derived from the MAC address
when the device is started.
BMS bus
u
The connection to the internal BMS bus is established via terminals BMS A/BMS B.
Connect the BMS bus. Use a shielded and twisted cable with a diameter of at least 0.8
mm for the interface line (e.g. CAT6/CAT7 min. AWG23). Connect the shield to earth at
one end. Please note that when routing the supply voltage
U
S
, a 4-wire cable (2 x BUS, 2 x
U
s
) with suitable cross section is required.
u
The first and last device on the BMS bus must be terminated with a terminating resistor.
Use the DIP switch on the bottom of the CP305 to set the terminating resistor for the BMS
bus (factory setting: off ).
u
For more information, see the BMS bus manual (D00276).
CP305-IO only
u
Use cables with a cross section of at least 0.75 mm
2
when connecting the digital inputs
and the relay output. The maximum cable length per connection is 500 m.
CP305_D00425_00_M_XXEN_09.2022
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Summary of Contents for COMTRAXX CP305
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