Selection of operation mode and operation location
PU operation interlock (Pr. 79 = 7)
The PU operation interlock function is designed to forcibly change the operation mode to ex-
ternal 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 the PU operation mode.
Set "7" (PU operation interlock) in Pr. 79. For the terminal used for X12 signal (PU operation in-
terlock signal) input, set "12" to any of Pr. 178 to Pr. 184 "Input terminal function selection" to as-
sign the function. (Refer to section 6.10.1 for Pr. 178 to Pr. 184.) When the X12 signal has not
been assigned, the function of the MRS signal switches from MRS (output stop) to the PU op-
eration interlock signal.
X12 (MRS) Signal
Tab. 6-53: Function of the X12 signal
Function/operation changed by switching on-off the X12 (MRS) signal
Tab. 6-54: Switching the X12 (MRS) signal
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.
At alarm occurrence, pressing the STOP/RESET key of the operation panel resets the
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 nor-
mal 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 sig-
nal 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 explana-
Changing the terminal assignment using Pr. 178 to Pr. 184 "Input terminal function selec-
tion" may affect the other functions. Please make setting after confirming the function of
6 - 206
Operation mode (external, PU, NET)
Output stop during external operation
Forcibly switched to external operation mode
External operation allowed.
Switching to PU or NET operation mode disa-
During stop ON → OFF
ON → OFF
OFF → ON
ON → OFF
OFF → ON
ON → OFF
Parameter write enabled (depending on Pr. 77
"Parameter write selection" and each parame-
ter write condition
(Refer to Tab. 6-1 for the parameter list.)
Parameter write disabled with exception of
If external operation frequency set-
ting and start signal are entered,
operation is performed in that status.
During operation → output stop
Output stop → During operation
Switching to PU,