ABB RMDE-01 Product Manual page 25

NETA-21 NEXA-21
1
3
Item Component name
1 PC (only during start-up and commissioning)
2 ETH2 port
3 Link to Cellular modem (A50) Ethernet ports
4 DDCS optical fibre transmitter
5 DDCS optical fibre receiver
6 ABB drive (or supply unit or inverter unit)
1
7
RDCO-02 (C) ; Connection terminal point is CH3, DDCS (PC) adapter module.
Connect the NEXA-21 primarily to fiber optic channel CH3 on the RDCO-02 (C) module.
You can also connect the NEXA-21 to CH0 if the maximum speed of the DDCS
communication does not increase above 1 Mbit/s.
The default NETA-21 settings for a DDCS network is ring topology and 1 Mbit/s
communication speed. NETA-21 automatically detects the connected devices when the
fibre optic channel is connected for the first time. If reconfiguration is needed at a later stage,
it can be done using the web interface.
Each drive connected through the RDCO-02 (C) CH0 or CH3 must have a unique node ID
configured for the DDCS fibre optic link. The settings can be done using control panel of
the drive. Typically the node IDs are configured in group 70 DDCS CONTROL. Check both
the node ID and used communication speed.
The changes to DDCS node ID is effective only after you power down and power up the
drive.
1
In addition to the RDCU, also other control units are compatible with DDCS adapters, for example, the
control units in the ACS880 series have these options available:
• ZCU-xx can be equipped with FDCO adapter (option +xxxx)
• BCU can be equipped with FDCO adapter (option +xxxx) or RDCO adapter (option +xxxx).
6
RDCU
7
T
R
4
2
5
Electrical installation 25
6 6
RDCU RDCU
7 7
T R
T R