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50 Actual signals and parameters
2006
UNDERVOLT
CTRL
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]).
ENABLE
DISABLE
Undervoltage control is deactivated
0
ENABLE (TIME)
Undervoltage control is activated. The control is active
for 500 ms.
1
ENABLE
Undervoltage control is activated. No operation time
limit.
2
2020
BRAKE
CHOPPER
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
.
EXTERNAL
INBUILT
Internal brake chopper control.
Note
: Ensure the brake resistor(s) is installed and the
overvoltage control is switched off by setting
parameter
to selection
0
EXTERNAL
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
to selection
1
All parameters
No.
Name/
Value
Description
Def/ FbEq
Summary of Contents for ACS355 series
Page 1: ...ABB machinery drives Supplement ACS355 Solar pump inverter N827...
Page 4: ......
Page 10: ...10 Safety...
Page 14: ...14 Introduction...
Page 18: ...18 Operating principle and hardware description...
Page 30: ...30 Start up and controls...
Page 36: ...36 Program features...
Page 66: ...66 Actual signals and parameters...
Page 70: ...70 Fault tracing...
Page 76: ...76 Technical data...