6-88
D DC Injection Activate (Setting: 60)
OFF Normal operation
ON Applies DC braking if the Inverter is stopped.
(Applies initial excitation when flux vector control is being used.)
• DC
braking is used to prevent the motor from rotating due to inertia or
external forces when the Inverter
is stopped.
• DC braking is performed if the DC braking input is ON while the Inverter is stopped.
• If
a run command or jog command (jog frequency reference, forward jog, or reverse jog) is input, the
DC braking will be cleared and motor operation will be started.
Output frequency
Run command
DC braking command
E1-09 Min. output frequency b2-01 Excitation level
ON
ON
OFF
OFF
DC braking DC braking
D External Search 1 (Settings: 61)
OFF Normal operation
ON Starts a speed search from the maximum frequency.
D External Search 2 (Settings: 62)
OFF Normal operation
ON Starts a speed search from the set frequency (the present reference frequency).
The
speed search function applies a lower voltage than normal, and finds the speed at the current flow
-
ing
at that time. The speed search is determined to be completed when the frequency
is lowered from
the maximum frequency (or a set frequency) and the current that is output falls below a fixed value.
When
the speed search is completed, the speed is accelerated to the frequency reference according to
the
acceleration time that has been set. For V/f with PG or flux vector control, detection occurs at the
motor speed with PG feedback, so there is no need to set this function.
• The
speed search function can be used to operate the motor without tripping when switching opera
-
tion from a commercial power supply and the Inverter or starting a coasting motor.
• The
speed
search will begin after the minimum baseblock time has elapsed when the run command is
input after the external search command has been turned ON.
• Either one of the external search functions can be set, but not both.
Advanced Operation Chapter
6
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