Note On External Power Supply; Parameter Settings - ABB ACS800-U7 Hardware Manual

78

Note on external power supply

External +24 V power supply for the RMIO board is recommended if
• the application requires a fast start after connecting the input power supply
• fieldbus communication is required when the input power supply is disconnected.
The RMIO board can be supplied from an external power source via terminal X23 or
X34 or via both X23 and X34. The internal power supply to terminal X34 can be left
connected when using terminal X23.
WARNING! If the RMIO board is supplied from an external power source via
terminal X34, the loose end of the cable removed from the RMIO board terminal
must be secured mechanically to a location where it cannot come into contact with
electrical parts. If the screw terminal plug of the cable is removed, the wire ends
must be individually insulated.
WARNING! If the RMIO board is powered from two power supplies (connected to
X23 and X34), and the external power supply connected to X23 is also used to
power external equipment, equip the RMIO branch of the circuit with a diode as
shown below. The diode ensures that the RMIO board will not be damaged by
overcurrent in case the external power supply fails.
+24 V DC

Parameter settings

In Standard Control Program, set parameter 16.09 CTRL BOARD SUPPLY to
EXTERNAL 24V if the RMIO board is powered from an external supply.
Motor control and I/O board (RMIO)
X23
+
1
-
2
Other
equipment
RMIO
+24V Auxiliary voltage output
and input, non-isolated,
GND
24 V DC 250 mA
X34
External or
2
+
internal power
3
-
supply