ABB ACS 400 User Manual page 130

Group 81: PFC Control
Parameters for Pump-Fan Control (PFC). "Appendix B" on page 157 gives detailed information on
PFC. "Application Macros" on page 53 describes the default signal connections.
Code Description
8103 REFERENCE STEP 1
Sets a percentage value that is added to the process reference when at least one auxiliary (constant speed)
motor is running. Default value is 0 %.
Example: An ACS 400 operates three parallel pumps that pump water to a pipe. The pressure in the pipe is
controlled. The constant pressure reference is set by parameter 4020
At low water consumption levels, only the speed regulated pump is run. When water consumption
increases, constant speed pumps are started; first one pump, and, if the demand is still growing, the other
pump.
When water flow increases, the pressure loss increases between the beginning (measurement site) and the
end of the pipe. By setting suitable reference steps (parameters 8103
REFERENCE STEP
reference steps compensate the growing pressure loss and prevent the pressure drop at the end of the
pipe.
8104 REFERENCE STEP 2
Sets a percentage value that is added to the process reference when at least two auxiliary (constant speed)
motors are running. Default value is 0 %. See parameter 8103
8105 REFERENCE STEP 3
Sets a percentage value that is added to the process reference when at least three auxiliary (constant
speed) motors are running. Default value is 0 %. See parameter 8103
8109 START FREQ 1
Sets a frequency limit. See Figure 50 on page 120. When ACS 400 output frequency exceeds value (8109
1 + 1 Hz) and no auxiliary motors are running, the Start Delay counter is started. When the time
START FREQ
set with parameter 8115
1 - 1 Hz), the first auxiliary motor is started.
START FREQ
After the first auxiliary motor is started, ACS 400 output frequency is decreased by value (8109
1 - 8112
FREQ LOW FREQ
Note! Start Frequency 1 should be within limits 8112
8110 START FREQ 2
Sets a frequency limit (see Figure 50). When the ACS 400 output frequency exceeds value (8110
2 + 1 Hz) and one auxiliary motor is running, the Start Delay counter is started. When the time set with
FREQ
parameter 8115
2 - 1 Hz), the second auxiliary motor is started.
FREQ
After the second auxiliary motor is started, the ACS 400 output frequency is decreased by value (8110
2 - 8113
START FREQ
Note! Start Frequency 2 should be within limits 8112
8111 START FREQ 3
Sets a frequency limit (see Figure 50). When the ACS 400 output frequency exceeds the value (8111
3 + 1 Hz) and two auxiliary motors are running, the Start Delay counter is started. When the time set
FREQ
with parameter 8115
3 - 1 Hz), the third auxiliary motor is started.
FREQ
After the third auxiliary motor is started, the ACS 400 output frequency is decreased by value (8111
3 - 8114
FREQ LOW FREQ
Note! Start Frequency 3 should be within limits 8112
ACS 400 User's Manual
2) the process reference is increased along with the increasing pumping capacity. The
AUX MOT START D
1).
is elapsed and if the output frequency is still above value (8110
AUX MOT START D
2).
LOW FREQ
is elapsed and if the output frequency is still above value (8111
AUX MOT START D
3).
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REFERENCE STEP
is elapsed and if the output frequency is still above value (8109
1 and 2008
LOW FREQ
2 and 2008
LOW FREQ
3 and 2008
LOW FREQ
.
INTERNAL SETPNT
1 and 8104
REFERENCE STEP
1
1.
REFERENCE STEP
-1.
MAXIMUM FREQ
-1.
MAXIMUM FREQ
-1.
MAXIMUM FREQ
START
START
START
START
START
START
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