ABB ACH550-02-645A-4 [227/454] Ach550 02 user s manual

ABB ACH550-02-645A-4 [227/454] Ach550 02 user s manual
Parameter listing and descriptions 223
ACH550-02 User's Manual
2006 UNDERVOLT CTRL 0…2
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 – Disables controller.
1 =
ENABLE(TIME) – Enables controller with a 500 ms time limit for the
operation.
2 =
ENABLE – Enables controller without a maximum time limit for the
operation.
2007 MINIMUM FREQ -500…500 Hz
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 MAXIMUM FREQ.
2008 MAXIMUM FREQ 0…500 Hz
Defines the maximum limit for the drive output frequency.
Code Description Range
P 2007
P 2008
Freq
-(P 2007)
-(P 2008)
P 2008
P 2007
Frequency range allowed
Frequency range allowed
Frequency range allowed
Time
Freq
Time
2007 value is >
0
0
0
2007 value is < 0

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