ABB ACH550-01, Руководство пользователя

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216 Parameter listing and descriptions
ACH550 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