Mitsubishi Electric FR-A800, Instruction Manual

Page: 461 / 1042

Parameters (D) Operation command and frequency command
FR-A800 5 - 281
Command source switchover via external terminals (X67)
●
In the Network operation mode, the start command source and speed command source can be
switched over by the command source switchover signal (X67). This can be used to control signal
inputs from both the external terminals and via communication.
●
For the X67 signal, set "67" to any of Pr. 178 to Pr. 189 (input terminal function selection) to assign
the function to a control terminal.
●
When the X67 signal is OFF, the start command source and speed command source are given via
control terminals.
5.9.4 Reverse rotation prevention selection
This function can prevent reverse rotation fault resulting from the incorrect input of the start signal.
●
Set this parameter to limit the motor rotation to only one direction.
●
This parameter is valid for all of the reverse rotation and forward rotation keys of the operation
panel and the parameter unit, the start signals (STF, STR signals) via external terminals, and the
forward and reverse rotation commands through communication.
NOTES The command source of communication follows the Pr. 550 and Pr. 551 settings.
The Pr. 338 and Pr. 339 settings can be changed while the inverter is running when Pr. 77 = "2".
Note that the setting change is applied after the inverter has stopped. Until the inverter has
stopped, communication operation command source and communication speed command
source before the setting change are valid.
X67 signal state Start command source Speed command source
Signal not assigned
According to Pr. 338 According to Pr. 339
ON
OFF Commands from external terminals are only valid.
Tab. 5-112: Switching of command source by the signal X67
NOTES The ON/OFF state of the X67 signal is applied only during a stop. When the terminals are switched
during operation, the ON/OFF state is applied after a stop.
When the X67 is OFF, a reset via communication is disabled.
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.
Parameters referred to
Pr. 28 Multi-speed input compensation selection => page 5-189
Pr. 59 Remote function selection => page 5-247
Pr. 79 Operation mode selection => page 5-263
Pr. Name Initial value Setting range Description
78
D020
Reverse rotation prevention
selection
0
0
Both forward and reverse rotations
allowed
1 Reverse rotation disabled
2 Forward rotation disabled