ABB ACH550-01 User Manual page 311

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 ACH550 operates three parallel pumps that maintain
water pressure in a pipe.
• 4011
INTERNAL SETPNT
controls the pressure in the pipe.
• The speed regulated pump operates alone at low water consumption
levels.
• As water consumption increases, the first auxiliary (constant speed)
pump starts to operate, then the second one.
• 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
• When two auxiliary pumps operate, increase the reference with
parameter 8103
2.
STEP
• When three auxiliary pumps operate, increase the reference with
parameter 8103
2 + parameter 8105
STEP
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
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
306
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sets a constant pressure reference that
1.
REFERENCE STEP
1 + parameter 8104
REFERENCE STEP
1 + parameter 8104
REFERENCE STEP
REFERENCE STEP
REFERENCE STEP
REFERENCE STEP
Parameter listing and descriptions
ACH550-01 User's Manual
Range
0.0...100%
REFERENCE
REFERENCE
3.
0.0...100%
1.
0.0...100%
1.