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Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual Page 115

Transistorized inverter, high function & low acoustic noise.
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( 2 ) Switch-over mode
You can select between PU operation, external operation and computer link operation (when FR-A5NR option
is used).
Operation Mode Switching
External operation to PU
operation
External operation to computer
link operation
PU operation to external
operation
PU operation to computer link
operation
Computer link operation to
external operation
Computer link operation to PU
operation
( 3 ) PU operation interlock
When the PU operation interlock signal is switched off, the operation mode is forcibly changed to the external
operation mode. This function prevents the inverter from being inoperative by the external command if the
mode is accidentally left unswitched from the PU operation mode.
1) Preparation
·
Set "7" in Pr. 79 (PU operation interlock).
·
Using any of Pr. 180 to Pr. 186 (multi-function input terminal assignment), allocate the terminal used to
input X12 (PU external interlock signal).
·
When the X12 signal is not assigned, the function of the MRS signal changes from MRS (output stop) to
PU external interlock.
2) Function
X12 (MRS)
Signal
Output stopped during external operation.
Operation mode can be switched to PU operation mode.
ON
Parameter values can be rewritten in PU operation
mode.
PU operation allowed.
Forcibly switched to external operation mode.
OFF
External operation allowed.
Switching to PU operation mode inhibited.
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Switching Operation/Operating Status
1) Select the PU operation mode.
z
Rotation direction is the same as that of external operation.
z
Set frequency is as set by the potentiometer (frequency setting potentiometer). (Note that
the setting will disappear when power is switched off or the inverter is reset.)
1) Mode change command to computer link mode is transmitted from the computer.
z
Rotation direction is the same as that of external operation.
z
Set frequency is as set by the potentiometer (frequency setting potentiometer). (Note that
the setting will disappear when power is switched off or the inverter is reset.)
1) Press the external operation key of the parameter unit.
z
Rotation direction is determined by the external operation input signal.
z
Set frequency is determined by the external frequency setting signal.
1) Mode change command to computer link mode is transmitted from the computer.
z
Rotation direction and set frequency are the same as those of PU operation.
1) The switch-over command to the external mode is sent from the computer.
z
Rotation direction is determined by the external operation input signal.
z
Set frequency is determined by the external frequency setting signal.
1) Select the PU operation mode with the operation panel or parameter unit.
z
Rotation direction and set frequency are the same as those of computer link operation.
Function/Operation
102
PARAMETERS

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