YASKAWA VS MINI J7 Series Instruction Manual page 76

Starting into a rotating motor - Tripless Operation
To start into a coasting motor without trip, use the speed search command or DC
injection braking at start.
• Speed search command
Speed matches into a coasting motor upon starting without stopping the motor.
This function enables smooth switching between motor commercial power supply
operation and inverter operation.
Set input terminal function selection (n36 to n39) 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
• DC injection braking at start (n52, n54)
When starting into a coasting motor, use DC injection to gradually brake the motor
before beginning the acceleration ramp. Set the DC injection braking time at start
in n54 in units of 0.1 second. Set DC injection braking current in n52 in units of 1%
(inverter rated current = 100%). When the setting of n54 is "0", DC injection
braking is not performed and acceleration starts from the minimum output
frequency.
When n52 is set to 0, acceleration starts from the minimum output frequency after
base blocking for n54 setting time.
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