PROGRAMMING
SINUS K
MANUAL
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226
3.12.
PID REGULATOR
3.12.1.
G
ENERAL
F
EATURES AND OUTPUT OPERATION
The inverter is supplied with a PID (Proportional, Integral, Derivative) regulator allowing to regulate physical variables,
such as pressure, capacity, speed, etc. provided that signal transducers are installed.
PID regulator parameters are included in the PID Regulator submenu (Measure/Parameters menu) and the Operation
method submenu (Configuration menu).
PID regulator loops may be programmed through parameter C28 (PID Action) (IFD SW) or C22 (VTC SW) in the “Op.
Method” submenu. Two options are available:
– Ext (factory setting)
⇒
PID regulator is independent of the inverter operation. It can be used to regulate any external physical variable
(thermoregulation on the machine where the inverter is installed). PID regulator output is available on one of the two
analog outputs. We suggest that terminal 17 be used, as it offers a better resolution.
– Ref
⇒
PID regulator output represents the frequency/speed reference used by the inverter; the motor speed is determined
by the regulator with respect to the physical values it is controlling.
– Add F / Add R
⇒
PID regulator output is summed to the main frequency/speed reference; the motor speed is “adjusted” by PID
regulator.
– Add V (IFD SW only)
⇒
PID regulator output is used to adjust the inverter output voltage (but not the inverter output frequency); the inverter
behaves as a frequency generator whose voltage is managed by PID regulator.
3.12.2.
M
ANAGING
PID
R
EGULATOR
I
NPUT
S
IGNALS
Parameters C29 (PID Ref) (IFD SW) or C23 (VTC SW) in the “Op. Method” submenu determine the origin of the PID
regulator reference value; you may choose between:
-
Kpd:
from keypad (factory setting)
-
Vref:
from voltage terminals (terminals 2 or 3)
-
Inaux: from voltage terminals (terminal 19)
-
Iref:
from current terminals (terminal 21)
-
Rem:
from serial line
Use parameters P91 (PID Ref Acc) and P92 (PID Ref Dec) to program an acceleration or deceleration ramp for the PID
reference.
Parameters C30 (PID F.B.) (IFD SW) or C24 (VTC SW) in the “Op. Method” submenu determine the terminal which the
feedback signal is to be applied to.
The following options are available:
-
Vref:
from voltage terminals (terminal 2 or 3) (factory setting)
-
Iref:
from current terminals (terminal 21)
-
Inaux: from voltage terminals (terminal 19)
-
Iout:
internal value proportional to output current