F-14
6.7 Operation frequency
6.7.1 Start-up frequency and End frequency
:
Start-up frequency
:
Stop frequency
[Parameter setting]
Title
Function
Adjustment range
Default setting
Start-up frequency
〜
[Hz]
Stop frequency
〜
[Hz]
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
:
Run frequency
:
Run frequency hysteresis
[Parameter setting]
Title
Function
Adjustment range
Default setting
Run frequency
〜
Run frequency hysteresis
〜
[Hz]
6.7.3 0Hz dead band frequency
:
0Hz dead band 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
.
・
Function
The start and stop of the motor can be controlled simply by giving frequency setting signals.
Start-up frequency
Stop frequency
Output frequency [Hz]
[s]
0
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.
0
A
B 100 Frequency reference [%]
+
−
Output frequency [Hz]
・
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].