Instruction manual

To operate coasting motor without trip, use the speed search command or
DC injection braking at start.
• Speed search command
Restarts a coasting motor without stopping it. This function enables
smooth switching between motor commercial power supply operation and
inverter operation.
Set multi-function input selection (n050 to n056) to “14” (search command
from maximum output frequency) or “15” (search command from set
frequency).
Build a sequence so that FWD (REV) run command is input at the same
time as the search command or after the search command. If the run
command is input before the search command, the search command
becomes disabled.
• Time chart at search command input
The deceleration time for speed search operation can be set in n101.
If the setting is 0, however, an initial value of 2.0s will be used.
The speed search starts when the inverter’s output current is greater than or
equal to the speed search operation level (n102).
• DC injection braking at start (n089, n091)
Restarts a coasting motor after stopping it. Set the DC injection braking
time at start in n091 in units of 0.1 second. Set DC injection braking
current in n089 in units of 1% (inverter rated
current =100%). When the setting of n091 is
“0”, DC injection braking is not performed
and acceleration starts from the minimum
output frequency.
When n089 is set to 0, acceleration starts from
the minimum output frequency after the
baseblocking for n091 setting time.
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Operating coasting motor without trip
ON
ON
FWD (REV) RUN COMMAND
SEARCH COMMAND
OUTPUT FREQUENCY
AGREED SPEED
DETECTION
MAX. OUTPUT FREQUENCY OR
FREQUENCY REFERENCE AT
RUN COMMAND INPUT
MIN. BASEBLOCK
TIME (0.5s)
SPEED SEARCH OPERATION
MIN. OUTPUT
FREQUENCY
n016
n091
DC INJECTION BRAKING
TIME AT START