Mitsubishi FR - S500 Instruction Manual page 109

(1) PU operation interlock
PU operation interlock forces the operation mode to be changed to the external
operation mode when the MRS signal switches off. 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 (operation mode selection).
Set the terminal used for MRS signal input with any of Pr. 60 to Pr. 63 (input terminal
function selection).
Refer to page 88 for Pr. 60 to Pr. 63 (input terminal function selection).
REMARKS
When terminal assignment is changed using Pr. 60 to Pr. 63, the other functions
may be affected.
Check the functions of the corresponding terminals before making settings.
2) Function
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.
<Function/operation changed by switching on-off the MRS signal>
Operating Condition
Operation
Status
mode
During
stop
PU
During
operation
During
stop
External
During
operation
Operation
MRS
Mode
Signal
(*2)
ON OFF
(*1)
PU
External
ON OFF
(*1)
OFF ON
ON OFF
External
OFF ON
ON OFF
Function/Operation
Operating Status
During stop
If external operation
frequency setting
and start signal are
entered, operation is
performed in that
status.
During stop
During operation
output stop
Output stop
operation
100
Switching to
Parameter
PU Operation
Write
Mode
Allowed
Disallowed
disallowed
Allowed
Disallowed
disallowed
Disallowed
Allowed
disallowed
Disallowed
Disallowed
disallowed
Disallowed
Disallowed
disallowed
Disallowed
Disallowed
disallowed