ABB DriveIT ACH550-01 User Manual page 222

Code Description
2006 UNDERVOLT CTRL
Sets the DC undervoltage controller
on or off. When on:
• If the DC bus voltage drops due to loss of input power, the
undervoltage controller decreases the motor speed in order to keep
the DC bus voltage above the lower limit.
• When the motor speed decreases, the inertia of the load causes
regeneration back into the drive, keeping the DC bus charged, and
preventing an undervoltage trip.
• The DC undervoltage controller increases power loss ride-through
on systems with a high inertia, such as a centrifuge or a fan.
0 =
DISABLE
1 =
ENABLE
operation.
2007 MINIMUM FREQ
Defines the minimum limit for the drive output frequency.
• A positive or zero minimum speed value defines two ranges,
one positive and one negative.
• A negative minimum speed value defines one speed range.
See figure.
Note! Keep
Freq
P 2008
P 2007
Freq
P 2008
P 2007
-(P 2007)
-(P 2008)
2008 MAXIMUM FREQ
Defines the maximum limit for the drive output frequency.
218
– Disables controller.
– Enables controller without a maximum time limit for
MINIMUM FREQ
2007 value is< 0
Frequency range allowed
0
2007 value is > 0
Frequency range allowed
0
Frequency range allowed
ACH550 User's Manual
Range
0=DISABLE,
1=ENABLE
-500...500 Hz
≤
MAXIMUM FREQ
Time
Time
0...500 Hz
Parameter listing and descriptions
.