Mitsubishi Electric FR-F820-00046 Instruction Manual page 445

Measured value
Upper limit level
Pr.131 (Pr.1143)
Upper limit pre-warning level
Lower limit pre-warning level
Lower limit level
Pr.132 (Pr.1144)
Normal set point
NOTE
• When Pr.554="5, 7, 15, or 17" and a deceleration stop is performed by the FUP/FDN signal detection, the set point changed
by the Pr.1372 setting value remains effective.
• The set point change by the PID upper/lower limit pre-warning function is enabled when the PID setting is applied to the
frequency.
• When the control switches between the first PID control and second PID control while the set point is changed by the Pr.1372
setting value or while the Y219 (Y220) signal is output, the set point returns to its original value.
• When the upper limit or lower limit is disabled (Pr.131 or Pr.132 = "9999"), the upper/lower limit pre-warning function is not
activated.
 PID dry run monitoring function (Pr.1370)
• This function can prevent operation without water in the pipes by monitoring the flow rate (measured value) inside the
pipes. When the flow rate decreases while the FU signal is ON, an output signal is sent for notification.
• The Dry run (DRY) signal is output during PID control when the measured value is lower than the lower limit (Pr.132 or
Pr.1144) and the output frequency is higher than the setting in Pr.42 Output frequency detection or Pr.43 Output
frequency detection for reverse rotation (FU signal ON) for the time set in Pr.1370 Detection time for PID limiting
operation.
• To use the DRY signal, set "228 (positive logic) or 328 (negative logic)" in any of Pr.190 to Pr.196 (Output terminal
function selection) to assign the function.
• The PID dry run monitoring function is enabled for the reverse action.
Measured value
Lower limit level
Pr.132 (Pr.1144)
Output frequency
Output frequency detection
Pr.42 (Pr.43)
NOTE
• The PID dry run monitoring function is enabled when the PID setting is applied to the frequency.
444
5. PARAMETERS
5.11 (A) Application parameters
Pr.1370 Pr.1370
FUP
FDN
ON
Y219(Y220)
Pr.1370 Pr.1370
Set point
Pr.1372
Pr.1372
Pr.1373
Measured value
FU
DRY
Measured value
Pr.1370 Pr.1370
ON
Pr.1370 Pr.1370
Pr.1373
Pr.1370 Pr.1370 Pr.1370 Pr.1370
ON
ON
Pr.1371
Pr.1370 Pr.1370
Pr.1371
Time
ON
ON
Pr.1370 Pr.1370
Pr.1373
Pr.1370 Pr.1370
ON
Time
Time