Mitsubishi Electric F720PJ-11KF, Manual

Page: 50 / 96

50
When setting parameters, refer to the instruction manual (applied) and understand instructions.
Used to select the stopping method (deceleration to a stop or
coasting) when the start signal turns off.
Used to stop the motor with a mechanical brake, etc. together with
switching off of the start signal.
You can also select the operations of the start signals (STF/STR).
When Pr. 250 is set to "9999" (initial value) or "8888".
When Pr. 250 is set to values other than "9999" (initial value) or
"8888".
You can disable the output phase failure protection function that
stops the inverter output if one of the inverter output side (load
side) three phases (U, V, W) opens.
The input phase failure protection selection of the inverter input
side (R, S, T) can be made valid.
Degrees of deterioration of main circuit capacitor, control circuit
capacitor or inrush current limit circuit and cooling fan can be
diagnosed by monitor.
When any part has approached the end of its life, an alarm can be
output by self diagnosis to prevent a fault.
(Use the life check of this function as a guideline since the life
except the main circuit capacitor is calculated theoretically.)
250
Selection of motor stopping method
and start signal
Pr.250 Stop selection
Pr.250
setting
Description
Start signal
(STF/STR)
Stop operation
0 to 100s
STF signal: Forward
rotation start
STR signal: Reverse
rotation start
The motor is coasted to a
stop when the preset time
elapses after the start
signal is turned off.
1000s to 1100s
STF signal: Start signal
STR signal: Forward/
reverse
rotation
signal
The motor is coasted to a
stop (
Pr. 250 - 1000)s after
the start signal is turned
off.
9999
(initial value)
STF signal: Forward
rotation start
STR signal: Reverse
rotation start
When the start signal is
turned off, the motor
decelerates to stop.
8888
STF signal: Start signal
STR signal: Forward/
reverse
rotation
signal
Time
ON OFF Start signal
Deceleration starts
when start signal turns OFF
Deceleration time
(Time set in
Pr. 8
, etc.)
DC brake
Output
frequency
(Hz)
ON OFF
RUN signal
OFF
ON
Start signal
The motor coasts to stop
Time
OFF
RUN signal
Output
frequency
(Hz)
ON
Output is shut off when set
time elapses after start
signal turned OFF
Pr. 250
251, 872
Input/output phase failure protection
selection
Pr.251 Output phase loss protection selection
Pr.872 Input phase loss protection selection
Pr.
Number
Setting Range Description
251
0
Without output phase failure
protection
1 (initial value) With output phase failure protection
872
0 (initial value) Without input phase failure protection
1 With input phase failure protection
255 to 259
Display of the life of the inverter parts
Pr.255 Life alarm status display Pr.256 Inrush current limit circuit life display
Pr.257 Control circuit capacitor life display Pr.258 Main circuit capacitor life display
Pr.259 Main circuit capacitor life measuring
Pr.
Number
Setting
Range
Description
255 (0 to 15)
Display whether the control circuit capacitor,
main circuit capacitor, cooling fan, and each
parts of the inrush current limit circuit has
reached the life alarm output level or not.
(Reading only)
256 (0 to 100%)
Display the deterioration degree of the inrush
current limit circuit.
(Reading only)
257 (0 to 100%)
Display the deterioration degree of the control
circuit capacitor.
(Reading only)
258 (0 to 100%)
Display the deterioration degree of the main
circuit capacitor.
(Reading only)
The value measured by
Pr. 259 is displayed.
259 0, 1
Setting "1" and turning off the power starts the
measurement of the main circuit capacitor life.
When the
Pr. 259 value is "3" after powering
ON again, the measuring is completed. Write
the deterioration degree in
Pr. 258 .
260
Refer to the section about Pr.72