ABB ACS355 Manual page 50

50 Actual signals and parameters
All parameters
No. Name/
Value
2006 UNDERVOLT
CTRL
DISABLE
ENABLE (TIME)
ENABLE
2020 BRAKE
CHOPPER
INBUILT
EXTERNAL
Description
Activates or deactivates the undervoltage control of
the intermediate DC link.
If the DC voltage drops due to input power failure, the
undervoltage controller automatically decreases the
motor speed to keep the voltage above the lower limit.
By decreasing the motor speed, the inertia of the load
regenerates back to the drive, keeping the DC link
charged and preventing an undervoltage trip until the
motor coasts to stop. This acts as a power-loss ride
through functionality in systems with high inertia, such
as a centrifuge or a fan. See section Motor
identification in ACS355 User's manual
(3AUA0000066143 [English]).
Undervoltage control is deactivated
Undervoltage control is activated. The control is active
for 500 ms.
Undervoltage control is activated. No operation time
limit.
Select the brake chopper control.
When using the inverter in a common DC bus system,
the parameter must to set to EXTERNAL. When in
common DC, the drive cannot feed or receive more
power than P .
N
Internal brake chopper control.
Note: Ensure the brake resistor(s) is installed and the
overvoltage control is switched off by setting
parameter 2005 OVERVOLT CTRL
DISABLE.
External brake chopper control.
Note:
• The drive is compatible only with ABB ACS-BRK-X
brake units.
• Ensure the brake unit is installed and the
overvoltage control is switched off by setting
parameter 2005 OVERVOLT CTRL
DISABLE.
Def/ FbEq
ENABLE
0
1
2
EXTERNAL
0
to selection
1
to selection