Mitsubishi Electric FR-F862-E Instruction Manual page 109

2
PID upper/lower limit pre-warning (Pr.1346, Pr.1370 to
Pr.1373)
Pr.1346 PID lower limit operation detection time is added.
Detection time for PID upper/lower limit pre-warning can be set separately.
Pr. Name
1346 PID lower limit operation
A457 detection time
1370 Detection time for PID limiting
A442 operation
1371 PID upper/lower limit pre-
A443 warning level range
1372 PID measured value control
A444 set point change amount
1373 PID measured value control
A445 set point change rate
• The set point can be changed to suppress increases 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 (Y219) signal or the Second PID upper/lower limit pre-warning (Y220) signal is output.
Also, the set point is changed by the amount set in Pr.1372 PID measured value control set point change
amount.
• To set the detection time for upper and lower limits separately, set Pr.1346 PID lower limit operation detection
time.
• Set the rate (%/s) in Pr.1373 PID measured value control set point change rate for changing the set point by
the Pr.1372 setting value. 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
Y219
Y220
Initial Setting
value range
0 to 900 s
9999
9999
0 s 0 to 900 s
0% to 50%
9999
9999
5% 0% to 50%
0% 0% to 100%
Pr.190 to Pr.196 setting
Positive logic
219
220
Set the time from when the measured value reaches the lower
limit pre-warning level (Pr.1371) until the set point change is
started.
The Pr.1370 setting is applied to the operation.
Set the time from when the measured value reaches the pre-
warning level (Pr.1371) until the set point change is started.
Set the operation range for the PID upper/lower limit pre-
warning function.
The PID upper/lower limit pre-warning function is disabled.
Set the set point change amount for the PID upper/lower limit
pre-warning operation.
Set the set point change rate for the PID upper/lower limit pre-
warning operation.
Negative logic
319
320
2
Description
BCN-C22005-976