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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
PID SET
•
Process PID (PID1) set 2, defined in
PID SET
The user can select between the two different sets by using
parameter 4027
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
PID, 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
•
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.
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1, and
2.
1
PID
PARAM SET
has to be set to value 0 (default value).
Parameter listing and descriptions
ACH550-01 User's Manual
Group 40: PROCESS
Group 41: PROCESS
.
Group 42: EXT / TRIM
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