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ACH550-01 User's Manual
Code Description
8121 REG BYPASS CTRL
Selects Regulator by-pass control. When enabled, Regulator by-pass
control provides a simple control mechanism without a PID regulator.
f
OUT
f
MAX
P 8110
P 8109
P 8113
P 8112
f
MIN
• Use Regulator by-pass control only in special applications.
0 =
– Disables Regulator by-pass control. The drive uses the normal
NO
PFA reference 1106
1 =
– Enables Regulator by-pass control.
YES
• The process PID regulator is bypassed.
Actual value of PID is used as the PFA reference (input). Normally
2 is used as the PFA reference.
EXT REF
• The drive uses the feedback signal defined by 4014
4114) for the PFA frequency reference.
• The figure shows the relation between the control signal 4014
(
4114) and the speed regulated motor's frequency in a three-
SEL
OR
motor system.
Example: In the diagram below, the pumping station's outlet flow is
controlled by the measured inlet flow (A).
Parameter listing and descriptions
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B
A
A = No auxiliary motors running
B = One auxiliary motor running
C = Two auxiliary motors running
2
.
REF
SELECT
Range
0=NO, 1=YES
P 4014
C
(%)
(or
FBK SEL
FBK
323
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