Automatic Setting Mode Of High-Speed Operation Speed (F328=1, 2) - Toshiba TOSVERT VF-AS1 Instruction Manual

4.1.1. Automatic setting mode of high-speed operation
speed (f328=1, 2)
The diagram on the next page(Fig.1) is the timing chart when the automatic setting mode of high-speed
operation speed (f328=1) is applied to lift application.
At the operation frequency above the light-load high-speed operation switching lower limit frequency
(f331) (point A in the Fig.1), if a detected torque (*1) after completion of speed reach is below the
switching load torque during power running (f335 setting value), the inverter judges to be light-load.
For light-load operation, the frequency decided with the formula is determined as a target frequency
(high-speed operation frequency) and the operation is accelerated toward the target frequency. (Point B in
the Fig.1 Light-load high-speed operation)
Target frequency = (Value set with f335) × [Base frequency (vl)] / (Detection torque)
when target frequency ≦ ul (≦ fh)
*1: Average torque during light-load high-speed operation load detection time (f333) after light-load
high-speed operation load detection waiting time (f332) (5% or more)
Light-load detection is carried out after speed reach when an operation frequency is above the light-load
high-speed operation switching lower limit frequency (f331).
When each of conditions below is reached, the light-load high-speed operation is canceled and the
operation is returned to the frequency corresponding to a speed command value.
①If a heavy-load torque (f336) is exceeded during acceleration up to the high-speed operation
frequency.
②If a heavy-load torque during constant power running (f337) is exceeded after reaching the
automatic light-load high-speed operation frequency (f330) and after a lapse of the light-load
high-speed operation heavy load detection time (f334).
③If a speed command value less than the light-load high-speed operation switching lower limit
frequency (f331) is entered.
Note: The torque monitor at the light-load high-speed switching (detected value) is updated for every
operation.
These values can be monitored by setting the standard monitor parameter (f710) and status
monitor parameters 1 to 8 (f711 to f718).
Function
Light-load high-speed torque
monitor 1
(Detection torque monitor at
operation switching)
Light-load high-speed torque
monitor 2
(Detection torque monitor at
constant speed operation)
Description
Average torque during light-load high-speed operation
load detection time (f333) after a lapse of light-load
high-speed operation load detection waiting time
(f332)
Average torque after reaching automatic light-load
high-speed operation frequency (f330) and after a
lapse of light-load high-speed operation heavy load
detection time (f334)
5
E6581327
Monitor
output
Setting No.
64
Setting No.
65