163 db resistor type, 164 bus reg kp – Rockwell Automation Liqui-Flo 1.5 General Purpose and Vector Duty User Manual
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LiquiFlo 1.5 AC Drive, Software Reference Version 1.2
Selects whether the internal or an external DB resistor will be used.
Proportional gain for the bus regulator. Used to adjust regulator response.
!
ATTENTION: The adjust freq portion of the bus regulator function is
extremely useful for preventing nuisance overvoltage faults resulting
from aggressive decelerations, overhauling loads, and eccentric loads.
It forces the output frequency to be greater than commanded frequency
while the drive’s bus voltage is increasing towards levels that would
otherwise cause a fault. However, it can also cause either of the
following two conditions to occur:
•
Fast positive changes in input voltage (more than a 10% increase
within 6 minutes) can cause uncommanded positive speed changes;
however, an OverSpeed Limit fault will occur if the speed reaches Max
Speed + Overspeed Limit. If this condition is unacceptable, action
should be taken to 1) limit supply voltages within the specification of
the drive, and 2) limit fast positive input voltage changes to less than
10%. Without taking such actions, if this operation is unacceptable,
the adjust freq portion of the bus regulator function must be disabled
(see parameters 161 and 162).
•
Actual deceleration times can be longer than commanded
deceleration times; however, a Decel Inhibit fault is generated if the
drive stops decelerating altogether. If this condition is unacceptable,
the adjust freq portion of the bus regulator must be disabled (see
parameters 161 and 162). In addition, installing a properly sized
dynamic brake resistor will provide equal or better performance in
most cases.
Note that these faults are not instantaneous and have shown test
results that take between 2 and 12 seconds to occur.
163
DB Resistor Type
Range:
0 = Internal Res
1 = External Res
2 = None
Default:
2 = None
Access:
0
Path: Dynamic Control>Stop/Brake Modes
See also:
161, 162
164
Bus Reg Kp
Range:
0 to 10000
Default:
1200
Access:
1
Path: Dynamic Control>Stop/Brake Modes
See also: