Mitsubishi Electric 800 Series, Instruction Manual, Page: 263 / 727

(E) Environment setting parameters
262
PARAMETERS
• When the PWM carrier frequency automatic reduction function is used, the operation with the carrier frequency set to 3 kHz
or higher ( Pr.72

"3") automatically reduces the carrier frequency for heavy-load operation as shown below.
NOTE
• Reducing the PWM carrier frequency is effective as a countermeasure against EMI from the inverter or for reducing leakage
current, but doing so increases the motor noise.
• When the PWM carrier frequency is set to 1 kHz or lower ( Pr.72

1), the increase in the harmonic current causes the fast-
response current limit to activate before the stall prevention operation, which may result in torque shortage. In this case,
disable the fast-response current limit in
Pr.156 Stall prevention operation selection .
• During fast-response operation, the carrier frequency automatic reduction function is disabled.
??????? Parameters referred to
Pr.156 Stall prevention operation selection page 332
Pr.570 Multiple rating setting page 249
Pr.800 Control method selection page 137
5.7.16
Inverter parts life display

The setting range (reading only) for separated converter types is "0, 1, 4, or 5".

The setting is available only for standard models.
Pr.260
setting
Pr.570
setting
Carrier frequency automatic reduction operation
FR-A860-01080 or lower FR-A860-01440 or higher
1
0 (SLD),
1 (LD)
Continuous operation with the 85% or higher inverter rated current reduces the carrier frequency automatically.
2 (ND),
3 (HD)
Operation with the 150% or higher inverter rated
current for the ND rating reduces the carrier frequency
automatically. Continuous operation with the 85% or higher inverter
rated current reduces the carrier frequency
automatically.
0
0 (SLD) Continuous operation with the 85% or higher inverter rated current reduces the carrier frequency automatically.
1 (LD)
Without carrier frequency automatic reduction
(Perform continuous operation with the carrier frequency set to 2 kHz or lower or with less than 85% of the
inverter rated current.)
2 (ND),
3 (HD)
Without carrier frequency automatic reduction
Without carrier frequency automatic reduction
(Perform continuous operation with the carrier
frequency set to 2 kHz or lower or with less than 85%
of the inverter rated current.)
The degree of deterioration of the control circuit capacitor, main circuit capacitor, cooling fan, and inrush current limit
circuit can be diagnosed on the monitor.
When a part approaches the end of its life, an alarm can be output by self diagnosis to prevent a fault.
(Note that the life diagnosis of this function should be used as a guideline only, because with the exception of the main
circuit capacitor, the life values are theoretical calculations.)
Pr. Name
Initial
value Setting
range
Description
255
E700
Life alarm status display
0 (0 to 15)

Displays whether or not the parts of the control
circuit capacitor, main circuit capacitor, cooling
fan, and inrush current limit circuit have reached
the life alarm output level. Read-only.
256
E701

Inrush current limit circuit life
display
100% (0 to 100%)
Displays the deterioration degree of the inrush
current limit circuit. Read-only.
257
E702 Control circuit capacitor life
display
100% (0 to 100%)
Displays the deterioration degree of the control
circuit capacitor. Read-only.
258
E703

Main circuit capacitor life
display
100% (0 to 100%)
Displays the deterioration degree of the main
circuit capacitor. Read-only.
The value measured by
Pr.259 is displayed.
259
E704

Main circuit capacitor life
measuring
0
0, 1
(2, 3, 8, 9)
Setting "1" and turning the power supply OFF
starts the measurement of the main circuit
capacitor life.
If the setting value of
Pr.259 becomes "3" after
turning the power supply ON again, it means that
the measurement is completed. The deterioration
degree is read to
Pr.258 .