Mitsubishi Electric FR-A800, Instruction Manual

Page: 449 / 1042

Parameters (D) Operation command and frequency command
FR-A800 5 - 269
●
If the X12 signal is not assigned, the function of the MRS signal is switched to PU operation internal
signal from MRS (output stop).
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
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.
X12 (MRS)
signal
Function/Operation
Operation mode Parameter writing
ON
Switching of the operation mode (External, PU,
and NET) is enabled.
Output is stopped during External operation.
Parameter writing enabled
OFF
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.
Writing of parameters other than Pr. 79 is disabled.
Tab. 5-102: Function of the X12 signal
Operating status
X12 (MRS) signal
Operation
mode
Operating status
Switching to PU
or NET
operation mode
Operation
mode
Status
PU/NET
during a
stop
ON
➔
OFF
External
If frequency and start commands are input
from external source, the inverter runs by
those commands.
Not available
Running
ON
➔
OFF
Not available
External
during a
stop
OFF
➔
ON
External
during a stop
Available
ON
➔
OFF
Not available
Running
OFF
➔
ON Running
➔
Output shutoff
Not available
ON
➔
OFF Output shutoff
➔
Running
Not available
Tab. 5-103: Switching the X12 (MRS) signal
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.