Eurotherm Drives 584S, Product Manual, Page: 86 / 176

Chapter 4 -SETTING-UP AND COMMISSIONING
584S Frequency Inverter 4-21
POLE PAIRS This parameter must correspond to the number of pole-pairs for the AC motor
being used. The most common form of AC motor has 4 poles or 2 pole-pairs.
If you are in doubt as to the correct number of pole-pairs your motor possesses,
please contact your motor supplier. Incorrect setting of this parameter will
result in an erroneous speed measurement.
NOTE: The motor synchronous speed can be calculated from the motor supply frequency and the
pole-pairs using the following :
Nsync rpm
Freq Hz
pole pairs
( )
( )
= ×
−
60
eg. a 4 pole motor (2 pole-pairs) with a base speed of 50Hz will have a synchronous speed of
1500rpm.
PID
Current software provides the user with a general purpose PID controller block internal to the drive. The PID can be
used either in conjunction with speed feedback to provided closed-loop speed control, or with other external
setpoints and feedbacks for closed-loop process control.
ENABLE
INTEGRAL DEFEAT
INPUT 1
R
D
RATIO1
DIVIDER1
R
D
RATIO2
DIVIDER2
+
-
INPUT 2
POS LIMIT
NEG LIMIT
O/P SCALER
PID OUTPUT
Kp(1+sTi)(1+sTd)
sTi(1+sTf)
PROP GAIN
INTEGRAL TC
DERIVATIVE TC
SETPOINT
FEEDBACK
PROP GAIN
This parameter is the true proportional gain of the PID controller. With a
PROP GAIN
of zero, the PID output would become zero. Range: 0.0 to
100.0. Default: 1.0.
INTEGRAL TC
This parameter is the integral time constant of the PID controller. Range: 0.01
to 100.00s. Default: 1.00s.
DERIVATIVE TC
This parameter is the derivative time constant of the PID controller. Range:
0.000 to 10.000s. Default: 0.000s. With the
DERIVATIVE TC
set to zero,
the PID becomes a P+I controller.
FILTER TC
In order to help attenuate high frequency noise on the PID output, a first order
lag output filter has been provided. The
FILTER TC parameter determines the
output filter time constant. Range: 0.000 to 10.000s. Default: 2.000s.
POSITIVE LIMIT
This parameter determines the maximum positive excursion of the PID output.
Range: 0.00 to 105.00%. Default: 100%. PID output corresponds to the
LIMIT FREQUENCY
.
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