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
REF2 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 REF2 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
BC(%)
f
OUT
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