Bosch Rexroth EFC 3600 Operating Instructions Manual page 116

Bosch Rexroth AG
Parameter Settings
If I component is disabled during PID control, it stops integration but keeps output
at its current value (not cleared to zero); if I component is enabled again during
PID operation, I component continues to work.
● Td: Derivative time
– Used to respond fast to changes of deviation between reference and feedback in
the system.
Larger Td means faster response, but too large Td leads to oscillation.
– Special case: If Td=0, D component is disabled.
If D component is disabled during PID control, it stops derivative, the current val‐
ue is cleared to zero.
● T: Sample period
Sample period is the sampling time of the PID control. This value should match with
the selected time constant of Ti or Td. Normally, the sampling period should be less
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 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 follow immediately the change in the
trend. When the output reaches its frequency limit, the integration stops.
● 1: Continue integral regulation
The integral value responds to the changes between reference and feedback values.
When the output reaches the maximum frequency limit the integrator continues up to
its possible numerical integration limit, not the maximum frequency limit.
When the trend of reference and feedback values changes, more time is needed to
eliminate the impact of continuous integral regulation before the integral value can
follow the change in the trend.
114/235
DOK-RCON03-EFC-3600***-IT01-EN-P
Rexroth Frequency Converter EFC 3600