Mitsubishi Electric FR-A700 Technical Manual page 178

(5) Switchover mode
When [Pr. 79 = 6] is set, you can switch between the PU operation, External operation and Network operation (when RS-
485 terminals or communication option is used) while continuing operation.
Operation Mode
Switching
External operation
operation
External operation
operation
PU operation External
operation
PU operation NET
operation
NET operation External
operation
NET operation PU
operation
(6) PU operation interlock
The PU operation interlock function is designed to
forcibly change the operation mode to the External
operation mode when the PU operation interlock
signal (X12) input turns OFF.
This function prevents the inverter from being
inoperative by the external command if the mode is
accidentally left unchanged from PU operation mode.
Select [Pr. 79 = 7] (PU operation interlock).
X12 (MRS) signal
Operation mode (External, PU, NET) switching enabled
ON
Output stop during external operation
Forcibly switched to External operation mode
OFF External operation allowed
Switching to PU or NET operation mode is disabled
<Function and operation changed by switching ON-OFF the X12 (MRS) signal>
Operating Condition
Operation
Status
mode
During
PU/NET
stop
Running ON
During
stop
External
Running
*1 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 turned OFF with either of
STF and STR is ON.
*2 At fault occurrence, pressing
[Pr. 79 = 6]
Select the PU operation mode with the operation panel or parameter unit.
PU
• Rotation direction is the same as that of external operation.
• The frequency set with the potentiometer (frequency command) or like is used unchanged.
(Note that the setting will disappear when power is switched OFF or the inverter is reset.)
Send the mode change command to the Network operation mode through communication.
NET
• Rotation direction is the same as that of external operation.
• The value set with the setting potentiometer (frequency command) or like is used unchanged.
(Note that the setting will disappear when power is switched OFF or the inverter is reset.)
Press the external operation key of the parameter unit.
• The rotation direction is determined by the input signal of the external operation.
• The set frequency is determined by the external frequency command signal.
Send the mode change command to the Network operation mode through communication.
• Rotation direction and set frequency are the same as those of PU operation.
Command to change to external mode is transmitted by communication.
• The rotation direction is determined by the input signal of the external operation.
• The set frequency is determined by the external frequency command signal.
Select the PU operation mode with the operation panel or parameter unit.
• The rotation direction and frequency command in the Network operation mode are used unchanged.
[Pr. 79 = 7]
Operation mode
Operation
X12 (MRS) Signal
Mode
ON OFF *1
External
OFF *1
OFF ON
ON OFF
External
OFF ON
ON OFF
of the operation panel resets the inverter.
Switching Operation Operating Status
For the terminal used for the X12 signal (PU
operation interlock signal) input, set 12 in [Pr. 178 to
Pr. 189
functions.
When the X12 signal is not assigned, function of the
MRS signal switches from MRS (output stop) to PU
operation interlock signal. When the MRS signal is
used as the PU operation interlock signal, the logic of
the signal is as set in [Pr. 17]. When [Pr. 17 = 2], read
ON as OFF and OFF as ON in the above
explanation.
Function Operation
Parameter write enabled (depending on [Pr. 77
Parameter write selection] and each parameter write
conditions)
Parameter write disabled with exception of [Pr. 79]
Operating Status
If external operation frequency setting and start
signal are entered, operation is performed in that
*2
status.
During stop
*2
During operation output stop
Output stop operation
212
PARAMETER
input terminal function selection] to assign
Parameter write
Switching to PU,
NET Operation
Mode
Disabled
Disabled
Enabled
Disabled
Disabled
Disabled