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Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual Page 116

Transistorized inverter, high function & low acoustic noise.
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<Function/operation changed by switching on-off the X12 (MRS) signal>
Operating Condition
X12 (MRS)
Operation
Signal
Status
mode
ON → OFF
During stop
(Note 3)
PU
ON → OFF
During
operation
(Note 3)
OFF → ON
During stop
ON → OFF
OFF → ON
External
During
ON → OFF
operation
Note: 1. When the Pr. 79 setting is 7 and the PU operation interlock signal is OFF, network operation such
as computer link cannot be used.
2. If the X12 (MRS) signal is on, the operation mode cannot be switched to the PU operation mode
when the start signal (STF, STR) is on.
3. The operation mode switches to the external operation mode independently of whether the start
signal (STF, STR) is on or off. Therefore, the motor is run in the external operation mode when
the X12 (MRS) signal is switched off with either of STF and STR on.
4. When an alarm occurs, the inverter can be reset by pressing the [RESET] key of the operation
panel.
5. When the MRS signal is used as the PU interlock signal, switching the MRS signal on and
rewriting the Pr. 79 value to other than 7 in the PU operation mode causes the MRS signal to
provide the ordinary MRS function (output stop). Also, as soon as 7 is set in Pr. 79, the MRS
signal acts as a PU interlock signal.
6. When the MRS signal is used as the PU external interlock signal, the signal logic conforms to the
Pr. 17 setting. When Pr. 17 = 2, read ON for OFF and OFF for ON in the above explanation.
( 4 ) Operation mode external signal switching function
1) Preparation
Set "8" (switching to other than external operation mode) in Pr. 79. Using any of Pr. 180 to Pr. 186 (input
terminal function selection), allocate the terminal used to input the X16 (PU-external operation switching)
signal.
2) Function
When the X16 signal is switched on in the PU operation mode, the operation mode is forcibly changed to
the external operation mode. When the X16 signal is switched off in the external operation mode, the
operation mode is changed to the PU operation mode. When the X16 signal is switched off during network
operation such as computer link, the operation mode is changed to the PU operation mode as soon as the
switch-over command to the external operation mode is sent from the computer. Note that this switch-over
may only be made while the inverter is at a stop and cannot be made during operation.
X16 Signal
ON
External operation mode (cannot be changed to the PU operation mode)
OFF
PU operation mode (cannot be changed to the external operation mode)
Note: When terminal assignment is changed using Pr. 180 to Pr. 186, the other functions may be affected.
Check the functions of the corresponding terminals before making setting.
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Operation
Mode
Operating Status
(Note 4)
During stop
If external operation
External
frequency setting and start
signal are entered,
operation is performed in
that status.
During stop
Disallowed → disallowed
External
During operation →
output stop
Operation Mode
103
PARAMETERS
Switching
to PU
Parameter Write
Operation
Mode
Allowed → disallowed
Disallowed
Allowed → disallowed
Disallowed
Disallowed → disallowed
Allowed
Disallowed → disallowed
Disallowed
Disallowed → disallowed
Disallowed
Disallowed → disallowed
Disallowed

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