Mitsubishi Electric FR-A740-00023 Instruction Manual page 316

Selection of operation mode and operation location
(8) Switch-over mode (setting "6")
⋅ While continuing operation, you can switch between the 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 222 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
OFF External operation allowed
Switching to PU or NET operation mode 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 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. Please
make setting after confirming the function of each terminal.
306
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 volume (frequency setting potentiometer), 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 volume (frequency setting potentiometer) 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 setting 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.
Command to change to external mode is transmitted by communication.
⋅ Rotation direction is determined by the external operation input signal.
⋅ The set frequency is determined by the external frequency setting signal.
Select the PU operation mode with the operation panel or parameter unit.
⋅ The rotation direction and set frequency signal in network operation mode are used unchanged.
Operation mode
X12 (MRS) Operation
Signal Mode
ON→OFF
*1
External
*2
ON→OFF
*1
OFF→ON
ON→OFF
External
*2
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 65 for the parameter list))
Parameter write disabled with exception of Pr. 79
Operating Status
If external operation frequency setting and start signal
are entered, operation is performed in that status.
During stop
During operation → output stop
Output stop → operation
Parameter write
Switching to
PU, NET
Operation Mode
Disallowed
Disallowed
Allowed
Disallowed
Disallowed
Disallowed