Chapter 5 Parameter Introductions 57
EV2000 Series Universal Variable Speed Drive User Manual
6: pulse input
Both single-phase PG feedback and dual-phase PG
feedback can be used. Refer to the definitions of
multi-function input terminal X7 and X8 (functions of
F7.06~F7.07).
F5.03 Reference filter
Range:0.01~50.00s【0.50s】
F5.04 Feedback filter
Range:0.01~50.00s【0.50s】
Both the reference signal and feedback signal carry
noise. These signals can be filtered by setting the time
constant of filter (F5.03 and F5.04). The bigger the time
constant, the better the immunity capability, but the
response becomes slow. The smaller the time constant,
the faster the response, but the immunity capability
becomes weak.
F5.05 Digital setting of
reference
Range:0.00~10.00V【0.00】
When analog feedback is used (F5.02=0~5), this
function can realize digital setting of reference via panel
or serial port.
F5.06 Close-loop speed
reference
Range:0~39000rpm【0 rpm】
If PG pulse feedback is used (F5.02=6), the speed
reference can be set by panel or serial port
F5.07 Number of pulses per
revolution of PG
Range:1~9999【1024】
The setting of F5.07 is determined by the parameters of
PG.
F5.08 Min reference
Range:0.0%~ F5.10
【0.0%】
F5.09 Feedback value
corresponding to the Min
reference
Range:0.0~ 100.0%
【20.0%】
F5.10 Max reference
Range:F5.08~ 100.0%
【100.0%】
F5.11 Feedback value
corresponding to the Max
reference
Range:0.0~ 100.0%
【100.0%】
F5.08~F5.11 define the relationship between the
close-loop reference and feedback value. The setting is
the ratio (percentage value) of input and feedback value
to reference (10V or 20mA).
Max reference
corresponding to
feedback value
Min reference
corresponding
to feedback
value
Max
reference
Min
reference
(1) positive regulation of feedback
Max reference
corresponding to
feedback value
Min reference
corresponding
to feedback
value
Min
reference
Max
reference
(2) negative regulation of feedback
Fig. 5-34 Relationship between feedback and reference
F5.12 Proportional gain K
P
Range:0.000~9.999【0.050】
F5.13 Integral gain Ki
Range:0.000~9.999【0050】
F5.14 Sampling cycle T
Range:0.01~50.00s【0.50s】
The bigger the proportional gain of K
P
, the faster the
response, but oscillation may easily occur.
If only proportional gain K
P
is used in regulation, the
error cannot be eliminated completely. To eliminate the
error, please use the integral gain Ki to form a PI control
system. The bigger the Ki, the faster the response, but
oscillation may easily occur if Ki is too big.
The sampling cycle T refers to the sampling cycle of
feedback value. The PI regulator calculates once in
each sampling cycle. The bigger the sampling cycle the
slower the response.
F5.15 Error limit
Range:0.0~20%【2.0%】
It defines the max. deviation of the output from the
reference, as shown in Fig. 5-35. PI regulator stops
operation when the feedback value is within this range.
Setting this parameter correctly is helpful to improve the
system output accuracy and stability.
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