Mitsubishi 700 Series Instruction Manual page 96

Parameter
Function Name
PID control
automatic
127
switchover
frequency
PID action
128
selection
PID proportional
129
band
130
PID integral time
131
PID upper limit
132
PID lower limit
PID action set
133
point
PID differential
134
time
Second
acceleration/
44
deceleration time
Second
45
deceleration time
Output
interruption
575
detection time
Output
interruption
576
detection level
Output
interruption
577
cancel level
Incre- Initial
Range
ments Value
Frequency at which the control is
0 to 400Hz
automatically changed to PID control.
0.01Hz 9999
9999 Without PID automatic switchover function
0 PID control invalid
20 PID reverse action
1 0
21 PID forward action
40 to 43 Dancer control
If the proportional band is narrow
(parameter setting is small), the
manipulated variable varies greatly with a
0.1 to
slight change of the measured value.
Hence, as the proportional band narrows,
0.1% 100% 1000%
the response sensitivity (gain) improves
but the stability deteriorates, e.g. hunting
occurs. Gain Kp= 1/proportional band
9999 No proportional control
For deviation step input, time (Ti) required
for only the integral (I) action to provide the
0.1 to
same manipulated variable as that for the
proportional (P) action. As the integral time
0.1s 1s 3600s
decreases, the set point is reached earlier
but hunting occurs more easily.
9999 No integral control.
Upper limit value.
If the feedback value exceeds the setting,
0 to 100% the FUP signal is output. The maximum
0.1% 9999
input (20mA/5V/10V) of the measured
value (terminal 4) is equivalent to 100%.
9999 No function
Lower limit value.
If the measured value falls below the
setting range, the FDN signal is output.
0 to 100%
The maximum input (20mA/5V/10V) of the
0.1% 9999
measured value (terminal 4) is equivalent
to 100%.
9999 No function
0 to 100% Used to set the set point for PID control.
0.01% 9999 PID control
9999
Dancer control
For deviation lamp input, time (Td) required
for providing only the manipulated variable
0.01 to 10s for the proportional (P) action. As the
0.01s 9999
differential time increases, greater
response is made to a deviation change.
9999 No differential control.
This parameter is the acceleration time of
the main speed during dancer control.
5/10/
It will not function as second acceleration
0.1s 0 to 3600s
time.
15s ∗
* Initial value differs according to the inverter
This parameter is the deceleration time of
0 to 3600s,
the main speed during dancer control.
0.1s 9999
It will not function as second deceleration
9999
time.
The inverter stops operation if the output
frequency after PID operation remains at
0 to 3600s
less than the Pr. 576 setting for longer than
0.1s 1s
the time set in Pr. 575.
9999 Without output interruption function
Set the frequency at which the output
0.01Hz 0Hz 0 to 400Hz
interruption processing is performed.
Set the level (Pr. 577 minus 1000%) at
900 to
0.1% 1000% which the PID output interruption function
1100%
is canceled.
Parameter list
Description
Measured value
input (terminal 4)
Set value (terminal
2 or Pr. 133)
Terminal 2 input
voltage is the set
point.
Always 50%
capacity. (3.7K or less/5.5K, 7.5K/11K, 15K)
3
87