Service manual

www.enc.net.cn/en Tel/Fax:[phone] Detailed function description
77
Sampling cycle T is sampling cycle for feedback value，during each sampling
cycle PID adjustor calculate for one time，the longer the sampling cycle is , the
slower the system responds.
F3.12 Deviation limit Range: 0.0－20.0(%) 2.0(%)
For Max. offset of closed-loop specified value，as shown in Fig.6-17，PID
adjustor stops adjusting when feedback value is within this range. To utilize this
function reasonably redound to harmonizing the conflict between system output
precision and stabilization.
F3.13
Integral separation PID
ad
j
ustin
g
threshold
Range: 0.0－100.0% 100.0%
PID integral separation，integral don’t react when specified value and feedback
value are bigger than this limit，only when specified value and feedback value are
smaller than or equal to this limit，integral react. Can adjust system response
speed by adjusting this parameter.
F3.14
Closed-loop preset
fre
q
uenc
y
Range: 0－high limit freq. 0.00Hz
F3.15
Closed-loop preset freq.
holding time
Range: 0.0－6000S 0.0S
This function can make closed-loop adjusting enter into stable phase quickly.
After closed-loop run starts, the inverter first accelerates to preset frequency F3.14
in terms of accelerating time，and after running at this frequency for a period of
time F3.15, it runs according to closed-loop characteristic. As shown in Fig.6-18.
F3.16 Sleep frequency threshold Range: 0.00－400.00Hz 30.00Hz
F3.17
Wake pressure threshold
Range: 0.000－F3.21Mpa 0.150Mpa
preset freq.
time T
preset freq. holding time
output freq.
offset
limit
time
time
Output
Fre
q
.
specified
value
Feedback
value
Fig.6-17 offset limit Fig.6-18 closed-loop preset freq.
Set preset freq. and holding time to “0’ if closed-loop preset freq. function is not needed.
note