Operation Frequency; Start-Up Frequency And End Frequency; Operating By Means Of Reference Signals; Hz Dead Band Frequency - Toshiba TOSVERT VF-A7 Instruction Manual

6.7 Operation frequency

6.7.1 Start-up frequency and End frequency



Function
The frequency set with the parameter  is put out immediately.
These parameters are used if the acceleration/deceleration time causes a delay in the response of
the starting torque. It is advisable to set these frequencies between 0.5 and 2 Hz (at a maximum
of 5 Hz). This setting reduces the slippage of motor below the rated value to prevent over-current.
If 0 speed torque is needed(pt = ,), set ,  at .
At startup: frequency set with  is put out immediately.
At stop: The output frequency drops to 0 Hz immediately by the frequency set with .
[Parameter setting]
Title
Start-up frequency

Stop frequency

Start-up frequency
Stop frequency
Note) Set these parameters so that the start-up frequency  is higher than the stop frequency .
If the -set frequency is lower than the -set frequency, the reference frequency
must be higher than the -set frequency to start the motor.

6.7.2 Operating by means of reference signals



Function
The start and stop of the motor can be controlled simply by giving frequency setting signals.
[Parameter setting]
Title
Run frequency

Run frequency hysteresis

Output frequency [Hz]
 

 

6.7.3 0Hz dead band frequency


Function
In order to fixe the motor axis by the control with a sensor, you may set frequency
reference as 0[Hz] by the analog input etc.. But it may be set to 0[Hz] neither
by the drift nor offset. In such a case, this function sets frequency instructions to
0[Hz] certainly. When frequency reference is smaller than -set value,
frequency reference is set to 0[Hz].
Start-up frequency
Stop frequency
Function
Output frequency [Hz]


Run frequency
Run frequency hysteresis
Function

0 A B
0Hz dead band frequency
Adjustment range
  [Hz]
  [Hz]
Adjustment range
 
  [Hz]
The motor starts to accelerate when the
frequency setting signal reaches point B, while
it starts to decelerate and stop when the
frequency setting signal falls below point A.
100 Frequency reference [%]
F-14
Default setting


[s]
Default setting

