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
A
B
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: [email protected]