Dc Overvoltage And Undervoltage Protection; Short-Circuit Protection; Module Temperature Supervision - ABB ACS880-304LC Series Hardware Manual

If the diode supply unit is equipped with a charging circuit, the DC voltage level must
be signaled to the control unit either through analog input AI2 (AI1) or fiber optic
connection between the supply unit and inverter unit (requires FDCO-01 DDCS
communication module). The charging function and DC voltage measurement source
must be defined by parameters. For more information, see the firmware manual.
Supply unit
FDCO-01 in ZCU control unit
V1R
CH A
V1T

DC overvoltage and undervoltage protection

￭
The supply unit control program monitors the measured DC voltage value. If it detects
an overvoltage or undervoltage, it trips the main contactor and generates a fault. For
more information, see the firmware manual.
Note: There is no DC voltage measurement in the supply unit as standard. See section
Implementing DC voltage measurement (page

Short-circuit protection

￭
AC fuses protect the supply unit against short circuit. The cabinet installer must acquire
and install the fuses. Fuses are available from ABB.
Note that the supply unit designs presented in this manual do not contain DC fuses.
The cabinet installer must arrange for appropriate short circuit protection on the DC
side.
DC fuses limit the DC short-circuit energy and are necessary when D8D modules are
used as a part of a multidrive configuration or when the total capacitance of the line-up
exceeds 36 mF or 4 × R8i modules.

Module temperature supervision

￭
Thermal switch [F6.1] supervises the temperature inside the supply module. Wire the
switch to a digital input (DI1) of the supply control unit (1 = OK, 0 = overtemperature).
In case of overtemperature, the switch opens and the control program generates first
a warning, and then, if the overtemperature indication remains over a predefined
delay, trips the supply unit on a fault. You can adjust the delay time by parameters.
For the example wirings, see
For cabinet temperature supervision, see
Operation principle and hardware description 17
Inverter unit
RDCO-04 in BCU control unit
CH1
16).
Example circuit diagrams (page
Cabinet temperature supervision (page
V15
V16
153).
39).