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