Toshiba Tosvert VF-S15 Instruction Manual page 169

[Parameter setting]
Title Function
Overload characteristic
aul
selection
PWM carrier frequency
f300
Random mode
f312
PWM carrier frequency
f316
control mode selection
Note 1: By f300 setting and ambient temperature, current reduction may be required.
Refer to the table on the following page.
Note 2: PWM carrier frequency is increased automatically at high output frequency range (100 Hz or more) for
stable operation, even if f300 is set to low PWM carrier frequency.
Note 3: When f300 is set to 8kHz or less, the random mode is exercised in the low output frequency range
where an annoying magnetic noise of the motor is generated.
Select the proper tone from the three kinds of f312 = 1, 2, 3 for the machinery.
Note 4: When f316 is set to "Carrier frequency without reduction", oh (overheat) or ol3 (main module
overload) trip can occur easily.
Reduce f601 or f185(stall prevention level) properly to avoid the trip.
Note 5: When reducing the voltage surge to the motor, set f316 to 2 or 3.
Use by setting f300 to 4kHz or less, to avoid the output voltage drop.
Note 6: When reducing the voltage surge to the motor, set f316 to 4 or 5.
However, when the machinery (load) is resonated and the cable length between the inverter and the
motor is long (30m or more), use by setting f300 to 4kHz or less.
Adjustment range
0: -
1: Constant torque characteristic（150%-60s）
2: Variable torque characteristic（120%-60s）
2.0-16.0 (kHz)
0: Disabled
1: Random mode 1
2: Random mode 2
3: Random mode 3
0: Carrier frequency without reduction
1: Carrier frequency with automatic reduction
2: Carrier frequency without reduction
(Support for 500V models) pattern 1
3: Carrier frequency with automatic reduction
(Support for 500V models) pattern 1
4: Carrier frequency without reduction
(Support for 500V models) pattern 2
5: Carrier frequency with automatic reduction
(Support for 500V models) pattern 2
F-57
E6582175
Default setting
0
12.0
0
1
(240V class)
5
(500V class)
6