Mitsubishi Electric FR-A820-00046 Instruction Manual page 449

Parameters
● If the X12 signal is not assigned, the function of the MRS signal is switched to PU operation internal
signal from MRS (output stop).
X12 (MRS)
signal
ON
OFF
Tab. 5-102: Function of the X12 signal
Depends on the Pr. 77 "Parameter write selection" setting and the writing conditions of each
parameter. (Refer to page 5-203.)
● Functions/operations by X12 (MRS) signal ON/OFF
Operating status
Operation
mode
PU/NET
External
Tab. 5-103: Switching the X12 (MRS) signal
The mode is switched to the External operation mode regardless of the ON/OFF state of the start
signals (STF, STR). Thus, the motor runs under the External operation mode when the X12 (MRS)
signal turns OFF with either of STF or STR in an ON state.
When a fault occurs, the inverter can be reset by pressing the STOP/RESET key on the operation
panel.
NOTES The operation mode cannot switched to the PU operation mode with the start signal (STF, STR) in
an ON state even if the X12 (MRS) signal is ON.
If the MRS signal is ON and Pr. 79 is written to a value other than "7" when the MRS signal is used as
the PU interlock signal during PU operation mode, the MRS signal will act as a regular MRS func-
tion (output stop). Also, when Pr. 79 = "7", the MRS signal becomes the PU interlock signal.
The logic of the signal follows the Pr. 17 "MRS input selection" setting also when the MRS signal is
used as the PU operation interlock signal. When Pr. 17 = "2", ON and OFF in the above explanation
are reversed.
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.
FR-A800
Operation mode
Switching of the operation mode (External, PU,
and NET) is enabled.
Output is stopped during External operation.
Operation mode is forcefully changed to the
External operation mode.
External operation is enabled.
Switching to the PU or NET operation mode
from the External operation mode is disabled.
X12 (MRS) signal
Status
during a
➔
ON OFF
stop
➔
Running
ON OFF
➔
OFF ON
during a
➔
stop
ON OFF
➔
OFF ON
Running
➔
ON OFF
(D) Operation command and frequency command
Function/Operation
Parameter writing
Parameter writing enabled
Writing of parameters other than Pr. 79 is disabled.
Operation
Operating status
mode
If frequency and start commands are input
from external source, the inverter runs by
External
those commands.
during a stop
External
➔
Running Output shutoff
➔
Output shutoff
Switching to PU
or NET
operation mode
Not available
Not available
Available
Not available
Not available
Running Not available
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