Mitsubishi Electric FR-F820-04750 Instruction Manual page 330

(H) Protective function parameter
MC operation
 : MC-ON
×: MC-OFF
—: During inverter operation, MC2-OFF, MC3-ON
During commercial power supply operation, MC2-ON, MC3-OFF
Invariance: The status before changing the signal ON or OFF is held.
NOTE During electronic bypass operation while the electronic bypass sequence is enabled (Pr. 135 = "1"),
the emergency drive function is not available.
PID control during emergency drive operation
● During emergency drive operation in the PID control mode, the operation is performed under PID
control using the Pr. 524 setting as a set point. Input the measured values in the method set in
Pr. 128 or Pr. 753.
● When the PID control mode is selected for emergency drive, the PID action during emergency
drive operation is as follows depending on the PID control setting.
Item
Measured value input
selection
Forward action /
reverse action selection
Proportional band
Integral time
Differential time
Applied to the frequency /
calculation only
Other PID-related settings
Tab. 5-74:
● While the "retry" (Pr. 523 = "22 , 32 ") is selected in the PID control mode, if a retry occurs at an
occurrence of E.CPU, E.1 to E.3, E.5 to E.7 during emergency drive operation, the operation is
performed not under PID control but with the fixed frequency. Use Pr. 1013 "Running speed after
emergency drive retry reset" to set the fixed frequency.
NOTE For details of the PID control, refer to page 5-347.
5 - 168
Set point / measured value
input setting
Held
Held
Held
Held
Held
Applied to the frequency
Held
Emergency drive operation depending on PID control setting
PID control action
Deviation input setting
Terminal 4 input
Held
Held
Held
Held
Applied to the frequency
Held
Parameters
Without PID control setting
Terminal 4 input
Reverse action (initial setting)
100% (initial setting)
1 s (initial setting)
Not used (initial setting)
Applied to the frequency
Held