ACS 400 User’s Manual 159
Figure 65 The control signal connections of the Pump and Fan Control (PFC) macro.
PID Controller
The ACS 400 has an internal PID controller which is in use when the PFC Control Macro is
selected. Key features of the PID controller are:
• PID sleep function to stop regulation when the output of the PID controller falls below preset
limit; recovery when the process actual value falls below the preset limit.
• Programmable sleep and wake-up delays. Sleep mode can also be activated through a digital
input.
• Two PID parameter sets, selectable through a digital input.
• PID controller parameters are in groups 40 and 41.
Control
Terminals
Analogue
inputs
EXT REF2
SELECT
1106
EXT REF1
SELECT
1103
EXT1/EXT2
SEL
1102
CONST
SPEED SEL
1201
AI1
EXT1
EXT2
KEYPAD
AI1
Remote
KEYPAD
Local
Remote
Local
Const.
speeds
Min freq
Max freq
Crit. sp.
Acc/Dec
KEYPAD
REF
SEL
1101
Digital
inputs
DI1-DI5
Keypad
Ref
Loc/Rem
REF2 (%)
REF1 (Hz)
Start/Stop, Direction
NOT SEL
DI1
KEYPAD
KEYPAD
EXT
1
EXT2
Local
Remote
REQUEST
FORWARD
REVERSE
Start/Stop
Direction
RUN ENABLE
DIRECTION
EXT
2
COMMANDS
1002
EXT1
COMMANDS
1001
NOT SEL
1003
1601
AI1
AI2
AI1
AI2
ACT2
ACT1
ACTUAL
VAL
SEL
4006
ACTUAL1
INPUT SEL
4007
ACTUAL 2
INPUT SEL
4008
PID
DI1...5
NOT SEL
DI4
PFC
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