– Decides the gain of deviation.
– Larger P means larger scale and faster response, but too large P leads to
vibration.
– P cannot eliminate deviation completely.
● Ti: Integral time
– Used to eliminate the deviation.
Smaller Ti means faster response of frequency converter to deviation
changes, but too small Ti leads to vibration.
– Special case: If Ti=0, integration is disabled.
If integration is disabled during PID control, it stops integration but keeps
output at its current value (not cleared to zero); if integration is enabled
again during PID operation, integration continues.
● Td: Derivative time
– Used to respond fast to changes of deviation between reference and feed-
back in the system.
Larger Td means faster response, but too large Td leads to vibration.
– Special case: If Td=0, derivative is disabled.
If derivative is disabled during PID control, it stops derivative, the current
value is cleared to zero.
● T: Sample period
Sample period is the sampling time in PID control. This value should match
with the selected time constant of Ti or Td. Normally, the sampling period
should be shorter than 1/5 of the time constant.
E3.14
Deviation width
Setting range 0.0 % ~ 20.0 % (closed loop reference value)
Minimum unit 0.1 %
Factory default 2.0 %
Used to set the limit of the deviation between reference and feedback signals to
stop internal PID control and keep the output stable, provided the PID feedback
deviation is within the setting range of E3.14.
E3.15
PID regulation mode
Setting range 0 ~ 1
Minimum unit 1
Factory default 0
When the output value of closed loop regulation reaches the upper ([b1.06]) or
lower ([b1.07]) limit of frequency, the integral mode has two action options:
● 0: Stop integral regulation
The integral value remains unchanged. When the trend of reference values
and feedback values changes, the integral value follows immediately the
EFC 3600
Bosch Rexroth AG
Parameter Settings
DOK-RCON03-EFC-3600***-IT03-EN-P
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