Mitsubishi Electric 800 Series Instruction Manual page 246

5.7.8 Emergency drive (Fire mode)
This function is used in case of emergency such as a fire to forcibly continue inverter operation to drive a motor without
activating protective functions even if the inverter detects a fault. Using this function may cause damage of the motor or the
inverter because driving the motor is given the highest priority. Use this function for emergency operation only. When the
inverter is damaged by a fault, the motor operation can be continued by switching to the commercial power supply operation.
The emergency drive function is available only for the standard model.
Pr. Name
523 Emergency drive mode
selection
*1
H320
524 Emergency drive running
H321 speed
*1*2
515 Emergency drive dedicated
retry count
*1
H322
1013 Running speed after
emergency drive retry reset
*1
H323
514 Emergency drive dedicated
retry waiting time
*1
H324
136 MC switchover interlock
A001 time
139 Automatic switchover
A004 frequency from inverter to
bypass operation
57 Restart coasting time
A702
*1 The setting is available only for standard models.
*2 Set Pr.524 after setting Pr.523.
*3 When Pr.523 = "100, 200, 300, 400", the emergency drive is activated regardless of the Pr.524 setting.
Initial value Setting range
9999 100, 111, 112, 121,
122, 123, 124, 200,
211, 212, 221, 222,
223, 224, 300, 311,
312, 321, 322, 323,
324, 400, 411, 412,
421, 422, 423, 424
9999
9999
*3
0 to 590 Hz
*3
0 to 100%
*3
9999
1 1 to 200
9999
60 Hz 0 to 590 Hz
9999 0.1 to 600 s
9999
1 s 0 to 100 s
9999 0 to 60 Hz
9999
9999 0
0.1 to 30 s
9999
Description
Select the operation mode of the emergency drive.
Emergency drive disabled
Set the running frequency in the fixed frequency mode
of the emergency drive. (when the fixed frequency
mode is selected in Pr.523)
Set the PID set point in the PID control mode of the
emergency drive. (when the PID control mode is
selected in Pr.523)
Emergency drive disabled
Set the retry count during emergency drive operation.
Without retry count excess (no restriction on the
number of retries)
Set the frequency for operation after a retry when any
of E.CPU, E.1 to E.3, E.5 to E.7 occurs during
emergency drive operation.
Set the retry waiting time during emergency drive
operation.
As set in Pr.68.
Set the operation interlock time for MC2 and MC3.
Set the frequency at which the inverter-driven
operation is switched over to the commercial power
supply operation when the condition for electronic
bypass is established during emergency drive
operation.
Without automatic switchover
Coasting time differs according to the inverter
capacity. (Refer to page 448.)
Set the waiting time for the inverter to perform a restart
after the power lost by an instantaneous power failure
restores.
No restart
5.7 (H) Protective function parameter
3
4
5
5
5
6
7
8
9
10
245
5. PARAMETERS