266
Parameter listing and descriptions
ACH550 User's Manual
PID controller
–
Advanced
The ACH550 has two separate PID controllers:
1. Process PID (PID1) and
2. External PID (PID2).
Process PID controller (PID1)
Process PID (PID1) has two separate sets of parameters:
• Process PID (PID1) set 1, defined in
, and
• Process PID (PID1) set 2, defined in
.
The user can select between the two different sets by using
parameter 4027
PID
1
PARAM
SET
.
Typically two different PID controller sets are being used when
the load of the motor changes considerably from one situation to
another.
External PID controller (PID2)
External PID (PID2), which is defined in
, can be used in two different ways:
• Instead of using additional PID controller hardware, External
PID can be set to control a field instrument like a damper or a
valve through outputs of the ACH550. In this case, parameter
4230
TRIM
MODE
has to be set to value 0 (default value).
• External PID (PID2) can be used as an additional PID
controller to Process PID (PID1) to trim or fine-tune the
speed of the ACH550.
An example of the trimming is a return fan that follows the speed
of the supply fan. As the return fan needs to run faster or slower
than the supply fan in order to create under- or overpressure,
correction factors to the supply fan speed are needed. External
PID (PID2) can be used in the return fan for ACH550 to provide
these corrections.
Summary of Contents for ACH550-01
Page 1: ...ACH550 User s Manual ACH550 01 Drives 0 75 110 kW ACH550 UH Drives 1 150 HP ABB ...
Page 10: ...Update Notice 8 ...
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Page 18: ...6 ACH550 User s Manual ...
Page 50: ...38 Preparing for installation ACH550 User s Manual ...
Page 325: ...313 ACH550 User s Manual ...
Page 358: ...346 ACH550 User s Manual ...
Page 409: ...Technical data 397 ACH550 User s Manual Frame size R1 IP54 UL Type 12 ...
Page 410: ...398 Technical data ACH550 User s Manual Frame size R2 IP54 UL Type 12 ...
Page 411: ...Technical data 399 ACH550 User s Manual Frame size R3 IP54 UL Type 12 ...
Page 412: ...400 Technical data ACH550 User s Manual Frame size R4 IP54 UL Type 12 ...
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Page 415: ...Technical data 403 ACH550 User s Manual Frame size R1 IP21 UL Type 1 ...
Page 416: ...404 Technical data ACH550 User s Manual Frame size R2 IP21 UL Type 1 ...
Page 417: ...Technical data 405 ACH550 User s Manual Frame size R3 IP21 UL Type 1 ...
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