ABB ACS550-01 User Manual page 116

116
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.
• Use Regulator by-pass control only in special
applications.
0 = – Disables Regulator by-pass control. The drive
NO
uses the normal PFC reference: 1106
1 = – Enables Regulator by-pass control.
YES
• The process PID regulator is bypassed.
Actual value of PID is used as the PFC reference
(input). Normally
reference.
• The drive uses the feedback signal defined by 4014
(or 4114) for the PFC frequency reference.
FBK SEL
• The figure shows the relation between the control
signal 4014
FBK SEL
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).
3
Mains 3~
3
ACS550
Inlet Pipe
8122 PFC START DELAY
Sets the start delay for speed regulated motors in the system. Using the delay, the drive works as follows:
• Switches on the contactor of the speed regulated motor – connecting the motor to the ACS550 power output.
• Delays motor start for the time 8122
• Starts the speed regulated motor.
• Starts auxiliary motors. See parameter 8115 for delay.
Warning! Motors equipped with star-delta starters require a PFC Start Delay.
• After the ACS550 relay output switches a motor On, the star-delta starter must switch to the star-connection and
then back to the delta-connection before the drive applies power.
• So, the PFC Start Delay must be longer than the time setting of the star-delta starter.
8123 PFC ENABLE
Selects PFC control. When enabled, PFC control:
• Switches in, or out, auxiliary constant speed motors as output demand increases or decreases. Parameters 8109
1 to 8114
START FREQ
• Adjusts the speed regulated motor output down, as auxiliary motors are added, and adjusts the speed regulated
motor output up, as auxiliary motors are taken off line.
• Provides Interlock functions, if enabled.
• Requires 9904
MOTOR CTRL MODE
0 = – Disables PFC control.
NOT SEL
1 = – Enables PFC control.
ACTIVE
Start-Up
2
REF SELECT
2 is used as the PFC
EXT REF
( 4114) and the speed
OR
Contactors
3
P1
P2
P3
A
Sewage
Tank
PFC START DELAY
3 define the switch points in terms of the drive output frequency.
LOW FREQ
= 3
SCALAR
f
OUT
f
MAX
.
P 8110
P 8109
P 8113
P 8112
f
MAX
A
A = No auxiliary motors running
B = One auxiliary motor running
C = Two auxiliary motors running
3
M
3
3~
3
P1
Outlet Pipe1
M
3~
Outlet Pipe2
P2
M
3~
P3 Outlet Pipe3
.
.
ACS550 User's Manual
P 4014
B C (%)