Mitsubishi Electric FR-F820-00046 Instruction Manual page 43

Check valve deceleration function (Pr.111 and Pr.1369)
• When the pump is stopped, slow deceleration can be applied to the predetermined section to prevent the water
hammer sound caused by closing the valve.
• The Pr.111 Check valve deceleration time setting is applied to the section between Pr.2 Minimum frequency
and Pr.1369 Check valve closing completion frequency.
Output frequency
Pr.127
(Pr.754)
Pr.2
Pr.1369
STF
PID
NOTE
• The check valve deceleration function is enabled when the PID setting is applied to the frequency.
• When the Pr.1369 setting is higher than the Pr.2 setting, the normal deceleration time (Pr.8 or Pr.45) setting is
applied.
PID upper/lower limit pre-warning (Pr.1370 to Pr.1373)
• The set point can be changed to prevent increase of the measured value before PID upper limit (FUP) or PID
lower limit (FDN) is detected.
• When the measured value reaches and remains at the pre-warning level set in Pr.1371 PID upper/lower limit
pre-warning level range for the time set in Pr.1370 Detection time for PID limiting operation, the PID upper/
lower limit pre-warning signal (Y219) or the second PID upper/lower limit pre-warning signal (Y220) is output.
Also, the set point is changed by the amount set in Pr.1372 PID measured value control set point change
amount.
• Set the rate (%/s) for changing the set point by the Pr.1372 setting value in Pr.1373 PID measured value control
set point change rate. When the measured value falls within the normal range, the set point returns to its original
value.
• For the Y219 and Y220 signals, assign the functions to output terminals using the Pr.190 to Pr.196 (output
terminal function selection).
Output signal
Positive logic
Y219 219
Y220 220
ON
ON
Pr.190 to Pr.196 setting
Negative logic
319
320
Normal deceleration time setting
Pr.8 Pr.111
(Pr.45)
9
Check valve deceleration time setting
Normal deceleration
time setting
Time
Pr.8
(Pr.45)
BCN-C22005-703