ABB ACH550-01 User Manual page 227

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 = – Disables controller.
DISABLE
1 = (
ENABLE TIME
operation.
2 = – Enables controller without a maximum time limit for the
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 the figure.
Note: Keep
MINIMUM FREQ
-(P 2007)
-(P 2008)
2008 MAXIMUM FREQ
Defines the maximum limit for the drive output frequency.
222
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) – Enables controller with a 500 ms time limit for the
≤
MAXIMUM FREQ
Freq
P 2008
Frequency range allowed
0
P 2007
Freq
P 2008
Frequency range allowed
P 2007
0
Frequency range allowed
Parameter listing and descriptions
ACH550-01 User's Manual
Range
0...2
-500...500 Hz
.
2007 value is < 0
Time
2007 value is > 0
Time
0...500 Hz