Mitsubishi Electric FR-A720-00030-NA Instruction Manual page 337

Selection of operation mode and operation location
(8) Switchover mode (setting "6")
 While continuing operation, you can switch among PU operation, External operation and Network operation (when
RS-485 terminals or communication option is used).
Operation Mode Switching
External operation  PU
operation
External operation  NET
operation
PU operation  external
operation
PU operation  NET
operation
NET operation  external
operation
NET operation  PU
operation
(9) PU operation interlock (setting "7")
 The PU operation interlock function is designed to forcibly change the operation mode to External operation mode when
the PU operation interlock signal (X12) input turns OFF. This function prevents the inverter from being inoperative by
the external command if the mode is accidentally left unswitched from PU operation mode.
 Set "7" (PU operation interlock) in Pr. 79.
 For the terminal used for X12 signal (PU operation interlock signal) input, set "12" in any of Pr. 178 to Pr. 189 (input
terminal function selection) to assign the function. (Refer to page 235 for Pr. 178 to Pr. 189.)
 When the X12 signal has not been assigned, the function of the MRS signal switches from MRS (output stop) to the
PU operation interlock signal.
X12 (MRS)
signal
Operation mode (external, PU, NET) switching
ON enabled
Output stop during external operation
Forcibly switched to External operation mode
External operation allowed
OFF
Switching to the PU or NET operation mode from
the External operation mode is disabled.
<Function/operation changed by switching ON/OFF the X12 (MRS) signal>
Operating Condition
Operation
Status
mode
During stop
PU/NET
Running
During stop
External
Running
*1 The operation mode switches to External operation mode independently of whether the start signal (STF, STR) is ON or OFF. Therefore,
the motor is run in External operation mode when the X12 (MRS) signal is turned OFF with either of STF and STR is ON.
*2 At alarm occurrence, pressing
CAUTION
 If the X12 (MRS) signal is ON, the operation mode cannot be switched to PU operation mode when the start signal (STF, STR) is ON.
 When the MRS signal is used as the PU interlock signal, the MRS signal serves as the normal MRS function (output stop) by
turning ON the MRS signal and then changing the Pr. 79 value to other than "7" in the PU operation mode. Also as soon as "7"
is set in Pr. 79, the signal acts as the PU interlock signal.
 When the MRS signal is used as the PU operation interlock signal, the logic of the signal is as set in Pr. 17. When Pr. 17 = "2",
read ON as OFF and OFF as ON in the above explanation.
 Changing the terminal assignment using Pr. 178 to Pr. 189 (input terminal function selection) may affect the other functions. Set
parameters after confirming the function of each terminal.
326
Select the PU operation mode with the operation panel or parameter unit.
 Rotation direction is the same as that of external operation.
 The frequency set with the potentiometer (frequency setting command), etc. is used unchanged. (Note
that the setting will disappear when power is switched off or the inverter is reset.)
Send the mode change command to Network operation mode through communication.
 Rotation direction is the same as that of external operation.
 The value set with the setting potentiometer (frequency setting command) or like is used unchanged.
(Note that the setting will disappear when power is switched off or the inverter is reset.)
Press the external operation key of the operation panel, parameter unit.
 The rotation direction is determined by the input signal of the external operation.
 The set frequency is determined by the external frequency command signal.
Send the mode change command to Network operation mode through communication.
 Rotation direction and set frequency are the same as those of PU operation.
Send the mode change command to External operation mode through communication.
 The rotation direction is determined by the input signal of the external operation.
 The set frequency is determined by the external frequency command signal.
Select the PU operation mode with the operation panel or parameter unit.
 The rotation direction and frequency command in Network operation mode are used unchanged.
Operation mode
X12 (MRS) Operation
signal Mode
ONOFF
*1
External
ONOFF
*1
OFFON
ONOFF
External
OFFON
ONOFF
of the operation panel resets the inverter.
Switching Operation/Operating Status
Function/Operation
Parameter write enabled (Pr. 77 Parameter write selection,
depending on the corresponding parameter write
condition (Refer to page 69 for the parameter list))
Parameter write disabled with exception of Pr. 79
Operating Status
If external operation frequency setting and start signal
*2
are entered, operation is performed in that status.
During stop
*2
During operation  output stop
Output stop  operation
Parameter write
Switching to
PU, NET
Operation Mode
Disallowed
Disallowed
Allowed
Disallowed
Disallowed
Disallowed