Toshiba TOSVERT VF-S15 Instruction Manual page 12

Set the value of corresponding parameters after each operation is checked.
(1)Setting of f337 (Heavy-load torque during constant power running)
Calculate f337 by the torque value τ3.
f337 = τ3 × ul/vl
(2)Setting of f335 (Switching load torque during power running)
Calculate f335 by f337
f335 = f337 - Max (τ3-τ1, 5%)
(3)Setting of f336 (Heavy-load torque during power running)
Calculate f336 by f337
f336 = f337 - Max (τ4-τ3, 5%)
(4)Setting of f338 (Switching load torque during regenerative braking)
Calculate f338 by the torque value τ7 and τ5.
f338 = (τ7 + Max (τ5-τ7, 5%) × ul/vl
<Example>
ul=120Hz, vl=60Hz
τ1=30%, τ2=40%, τ3=40%, τ4=50%
f337= 40% × 120Hz/60Hz = 80%
f335= 80% - Max (40%-30%, 5%) = 70%
f336= 80% + Max (50%-40%, 5%) = 90%
τ5=15%, τ6=5%, τ7=10%, τ8=0%
f338= (10% +Max (15%-10%, 5%)) ×120Hz/60Hz = 30%
Change f335 and f338 values little by little in order not to switch to the light-load high-speed
operation.
Change f336 and f337 values by the above changing.
The judgment value of heavy-load during acceleration of the power running is the value that added
the detected torque during operation at the light-load high-speed operation switching lower limit
frequency (f331) or more and the value f336 – f335.
The detected torque + (Heavy-load torque during power running (f336) – Switching load torque
during power running (f335) (0% or more))
The judgment value of heavy-load during constant power running is the value that added the
detected torque during operation at the light-load high-speed operation switching lower limit
frequency (f331) or more and the value of f337 – f335.
The detected torque + (Heavy-load torque during constant power running (f337) – Switching
load torque during power running (f335) (0% or more))
4) When reaching a state where the inverter will not switch to the light-load high-speed operation, check
that a high-speed operation frequency changes according to the change of load.
5) Restore the parameter changed in 1) to the initial value. (f711～f718)
If checking the torque with the monitor, there is no need to restore the initial value even after the
parameters are adjusted.
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E6581871