ACS510 User’s Manual 131
Start-Up
Code Description
8103 REFERENCE STEP 1
Sets a percentage value that is added to the process reference.
• Applies only when at least one
auxiliary (constant speed) motor is running.
• Default value is 0%.
Example: An ACS510 operates three parallel pumps that maintain water pressure in a pipe.
•4011
INTERNAL SETPNT sets a constant pressure reference that controls the pressure in the pipe.
• The speed regulated pump operates alone at low water consumption levels.
• As water consumption increases, first one constant speed pump operates, then, the second.
• As flow increases, the pressure at the output end of the pipe drops relative to the pressure measured at the input
end. As auxiliary motors step in to increase the flow, the adjustments below correct the reference to more closely
match the output pressure.
• When the first auxiliary pump operates, increase the reference with parameter 8103
REFERENCE STEP 1.
• When both auxiliary pumps operate, increase the reference with parameter 8103 reference step 1 + parameter
8104 reference step 2.
•When three auxiliary pumps operate, increase the reference with parameter 8103
REFERENCE STEP 1 + parameter
8104
REFERENCE STEP 2 + parameter 8105 REFERENCE STEP 3.
• When four auxiliary pumps operate, increase the reference with parameter 8103
REFERENCE STEP 1 + parameter
8104
REFERENCE STEP 2 + 2 X parameter 8105 REFERENCE STEP 3.
• When five auxiliary pumps operate, increase the reference with parameter 8103
REFERENCE STEP 1 + parameter
8104
REFERENCE STEP 2 + 3 X parameter 8105 REFERENCE STEP 3.
• When six auxiliary pumps operate, increase the reference with parameter 8103
REFERENCE STEP 1 + parameter
8104
REFERENCE STEP 2 + 4 X parameter 8105 REFERENCE STEP 3.
8104 REFERENCE STEP 2
Sets a percentage value that is added to the process reference.
• Applies only when at least two
auxiliary (constant speed) motors are running.
• See parameter 8103
REFERENCE STEP 1.
8105 REFERENCE STEP 3
Sets a percentage value that is added to the process reference.
• Applies only when at least three
auxiliary (constant speed) motors are running.
• See parameter 8103
REFERENCE STEP 1.
8109 START FREQ 1
Sets the frequency limit used to start the first auxiliary motor. The first auxiliary motor starts if:
• No auxiliary motors are running.
• ACS510 output frequency exceeds the limit:
8109 + 1 Hz.
• Output frequency stays above a relaxed limit
(8109 - 1 Hz) for at least the time: 8115
AUX MOT START D.
After the first auxiliary motor starts:
• Output frequency decreases by the value =
(8109
START FREQ 1) - (8112 LOW FREQ 1).
• In effect, the output of the speed regulated motor drops to
compensate for the input from the auxiliary motor.
See figure, where:
• A = (8109
START FREQ 1) - (8112 LOW FREQ 1)
• B = Output frequency increase during the start delay.
• C = Diagram showing auxiliary motor’s run status as frequency
increases (1 = On).
Note! 8109
START FREQ 1 value must be between:
• 8112
LOW FREQ 1
• (2008
MAXIMUM FREQ) -1.
8110 START FREQ 2
Sets the frequency limit used to start the second auxiliary motor.
• See 8109
START FREQ 1 for a complete description of the operation.
The second auxiliary motor starts if:
• One auxiliary motor is running.
• ACS510 output frequency exceeds the limit: 8110 + 1.
• Output frequency stays above the relaxed limit (8110 - 1 Hz) for at least the time: 8115
AUX MOT START D.
t
P 8115
(P 8109)+1
P 8112
AB
f (Hz)
f
MAX
f
MIN
1
0
t
C
P 8109
A
Supplied from China by: Guangzhou Tofee Electro Mechanical Equipment Co., Ltd
Email: info@tofee.com.cn
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