412 Parameters
External 24V The drive control unit is powered from an external power
supply. The drive power unit and power unit link faults are
masked when the drive is in stopped state, so the main circuit
can be powered down without faults while the control unit is
powered.
1
Redundant external
24V
(Type BCU control units only) The drive control unit is
powered from two redundant external power supplies. The
loss of one of the supplies generates a warning (AFEC
External power signal missing). The drive power unit and
power unit link faults are masked when the drive is in stopped
state, so the main circuit can be powered down without faults
while the control unit is powered.
2
95.08 DC switch
monitoring
(Only visible with a ZCU control unit)
Enables/disables DC switch monitoring via the DIIL input. This
setting is intended for use with inverter modules with an
internal charging circuit that are connected to the DC bus
through a DC switch.
An auxiliary contact of the DC switch must be wired to the DIIL
input so that the input switches off when the DC switch is
opened.
If the DC switch is opened with the inverter running, the
inverter is given a coast-to-stop command, and its charging
circuit activated.
Starting the inverter is prevented until the DC switch is closed
and the DC circuit in the inverter unit recharged.
Notes:
• By default, DIIL is the input for the Run enable signal.
Adjust 20.12 Run enable 1 source if necessary.
• An internal charging circuit is standard on some inverter
module types but optional on others; check with your local
ABB representative.
Disable;
Enable
(95.20 b5)
Disable DC switch monitoring through the DIIL input disabled. 0
Enable DC switch monitoring through the DIIL input enabled. 1
No. Name/Value Description Def/FbEq16
M
Charging
contactor
Charging
logic
+24 V
DIIL
Inverter module
DC bus
DC switch
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