Mitsubishi Electric 800 Series Instruction Manual page 347

• When Pr.127 PID control automatic switchover frequency is set, the startup is made without PID control until the output
frequency reaches the Pr.127 setting. Once the PID control starts, the PID control is continued even if the output frequency
drops to Pr.127 setting or lower.
Pr.127
 Operation selection and sleep function stop selection when a value error
is detected (FUP signal, FDN signal, Y48 signal, Pr.554)
• Using Pr.554 PID signal operation selection, set the action when the measured value input exceeds the upper limit
(Pr.131 PID upper limit) or lower limit (Pr.132 PID lower limit), or when the deviation input exceeds the permissible value
(Pr.553 PID deviation limit).
• Choose whether to output the signals (FUP, FDN, Y48) only or to activate the protective function to output the inverter
shutoff.
• The stop action when the inverter output is shut off by the sleep function can be selected.
Pr.554 setting
0 (initial value) Signal output only
1 Signal output + output shutoff (E.PID)
2 Signal output only
3 Signal output + output shutoff (E.PID)
10 Signal output only
11 Signal output + output shutoff (E.PID)
12 Signal output only
13 Signal output + output shutoff (E.PID)
*1 When each of Pr.131, Pr.132 and Pr.553 settings corresponding to each of the FUP, FDN and Y48 signals is "9999" (no function), signal output
and protective function are not available.
 PID output suspension function (sleep function) (SLEEP signal, Pr.575 to
Pr.577)
• When a status where the output frequency after PID calculation is less than Pr.576 Output interruption detection level
has continued for the time set in Pr.575 Output interruption detection time or longer, inverter running is suspended. This
allows the amount of energy consumed in the inefficient low-speed range to be reduced.
• When the deviation (set point - measured value) reaches the PID output shutoff release level (Pr.577 setting value -1000%)
while the PID output suspension function is activated, the PID output suspension function is released, and PID control
operation is automatically restarted.
• Whether to allow motor to coast to a stop or perform a deceleration stop when sleep operation is started can be selected
using Pr.554.
• While the PID output suspension function is activated, the PID output interruption (SLEEP) signal is output. During this
time, the Inverter running (RUN) signal turns OFF and the During PID control activated (PID) signal turns ON.
346
14.(A) Application Parameters
14.4 PID control
Output frequency
Without PID
control
STF
PID
At FUP/FDN signal output
PID control
Inverter operation
*1
At Y48 signal output
Signal output only
Signal output + output shutoff (E.PID)
Signal output only
Signal output + output shutoff (E.PID)
Time
*1
At sleep operation start
Coasts to stop
Deceleration stop