Pwm Carrier Frequency; Trip-Less Enhancement - Toshiba TOSVERT VF-P7 Instruction Manual

6.12 PWM carrier frequency

 ：PWM carrier frequency
・Function
1) The sound tone of acoustic noise can be changed by adjusting the PWM carrier frequency. This
adjustment is effective in preventing the motor from resonating with its load(machine) or its fan cover.
2) Decreasing the carrier frequency is also effective in reducing electromagnetic.
Note) Decreasing the carrier frequency reduces electromagnetic noise but increases acoustic noise.
[Parameter setting]
Title

(*1)Setting the PWM carrier frequency larger than the default value, reduction of rated current is
needed. For details, refer to figure and table below.
Rated current [%]
Voltage Applicable motor
class [V] capacity [kW]
18.5
22
30
200 37
45
55
75，90，110
18.5
22
30
37
45
400 55
75
90
110∼220
280
315
Note1) In vector control mode, set the carrier frequency to 2.2 [kHz] or over. Operation may
become unstable if the carrier frequency is lower than 2.2 [kHz].
Note2) In the case that the operation frequency is more than 130Hz,carrier frequency is limited
to less than 10kHz automatically.
Note3) Set the carrier frequency to 2.2kHz when sine wave filter (LFL,LFC)is used at output
side of inverter. Filter can be damaged by fire in the case of other than 2.2kHz

6.13 Trip-less enhancement

6.13.1 Auto-restart (restart during free-run (coast))
 ：Auto-restart
 ：Auto-restart adjustment #1
 ：Auto-restart adjustment #2
･ Do not get near the motor or the machine.
The motor and the machine unexpectedly restart after recovery from a momentary power
failure, which might cause injury to persons.
･ Stick caution labels to the inverter, the motor and the machine, to prevent accidents due
Mandatory
to an unexpected restart of them after recovery from a momentary power failure.
Function
PWM carrier frequency
100
①
Default setting
PWM carrier freq. [kHz]
Default setting Upper limit
12
12
12
8
8
2.2
2.2
12
12
12
8
8
8
2.2
2.2
2.2
2.2
2.2
Adjustment range
∼(, ) [kHz](*1)
[Upper limits differ by applicable motor
capacity. Refer to the table below.]
Upper limit
②
①Rated current
at upper limit [%]
15 No need of rated current reduction
15 90
15 93
15 No need of rated current reduction
15 80
8 85
5 No need of rated current reduction
15 No need of rated current reduction
15 90
15 89
15 70
15 80
15 65
8 70
5 75
5 80
5 75
5 70
 ：Auto-restart mode
 ：Auto-restart adjustment #3
Warning
F-20
Default setting
Model
dependent
PWM carrier frequency [kHz]
②Max value, no rated current
reduction is needed [kHz]
12
12
8
3
12
12
8
11
8
4
2.2
2.2
2.2
2.2