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F-15
[Parameter setting]
Title Function Adjustment range Default setting
0Hz dead band frequency
[Hz]
notes 1) This function is invalid to preset-speed operation.
notes 2) It is effective as frequency instructions to the
frequency reference chosen by the priority
processing by , , communication, etc.
notes 3) The addition and multiplication of the override
function is carried out to the frequency in which
this function operated.
6.8 DC injection braking
6.8.1 DC injection braking
DC injection braking start frequency
DC injection braking current
DC injection braking time
Forward/reverse DC braking priority control
[Parameter setting]
Title Function Adjustment range Default setting
DC injection braking start frequency
[Hz]
DC injection braking current
[%]
DC injection braking time
[s]
Forward/reverse DC braking priority control
: OFF, : ON
Note) The sensitivity of the inverter's overload protective function increases during D.C. braking. To avoid
tripping, the inverter may automatically adjust the D.C. braking rate. When DC injection braking current
is set at 60% or more at the time of standard motor use, by setup of DC injection braking time
, overload protection may operate by motor overload protection level. Do not set 0.0% to DC
injection braking current .
<D.C. braking start conditions>
The forward/reverse DC braking priority control function recognizes certain conditions as
stop commands from the inverter, and is activated when the output frequency goes down below
the DC injection braking start frequency set with . In this case, the conditions under which
DC injection braking starts include not only the issue of a start or stop command from the control
panel or an external input device, but also a fall in the reference frequency below the value set with
(stop frequency setting) or a fall in the output frequency below the operation stop
frequency.
Function
These parameters apply a direct current to the motor to obtain large braking torque.
These parameters are used to set the direct current to be applied to the motor, the
braking time and the braking start frequency.
[s]
DC injection braking
start frequency
DC injection braking current
DC injection braking time
Output frequency [Hz] DC injection braking
Operating signal F-CC
ON
OFF
Output current [A]
Reference
Display of blinks
Frequency after 0Hz
dead band operation
carried out.
0 [Hz]
Frequency reference