Toshiba Tosvert VF-AS1 - Manual (Page 126)

E6581301
F-14
6
0
H + H
H
H – H
HJ The inverter begins accelerating after
the frequency command value has
reached point B.
Deceleration stop begins when the
frequency command value decreases
below point A.
Output frequency [Hz]
A B 100% Operation frequency command value
6.7.3. Frequency setting signal 0Hz dead zone handling function
H : Frequency command dead band
• Function
If the frequency is set to 0Hz by means of an analog signal so that the motor shaft can be locked by sensor
vector control (RV=, ) the frequency may not always be 0Hz because of drift or offset.
In such a case, this parameter allows you to correctly set the operation frequency command to 0Hz. If the
operation frequency command is below the frequency setting signal 0Hz insensitive frequency set with
H
, parameter H will adjust the operation frequency command to 0Hz.
[Parameter setting]
Title Function Adjustment range Default setting
H Frequency command dead band ~Hz
Operation frequency
command value
Output after handling
of the dead zone
H
0Hz
Operation frequency
command value
Note 1: This function is invalid to preset
the speed operation frequency
command.
Note 2: It is effective as frequency
instruction is to the frequency
reference chosen by HOQF,
H
, communication,etc.
Note 3: The addition and multiplication of
the override function is carried out
to the frequency in which this
function operated.
6.8 DC braking
6.8.1 DC braking
H : DC braking starting frequency
H : DC braking current
H : DC braking time
H : Forward/reverse DC braking
priority control
• Function
A large braking torque can be obtained by applying a direct current to the motor. These parameters set the
direct current applied to the motor, the application time and the start frequency.
[Parameter setting]
Title Function Adjustment range Default setting
H DC braking start frequency ~Hz
H DC braking current ~%
H DC braking time ~ sec.
H Forward/reverse DC braking priority control :OFF, :ON