YASKAWA Varispeed V7 Instruction Manual page 151

DC Injection Braking at Startup (n089, n091)
Restarts a coasting motor after stopping it. Set the DC injection braking
time at startup in n091 in units of 0.1 second. Set the DC Injection Brak-
ing 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
baseblocking for the time set in n091.
Holding Acceleration/Deceleration Temporarily
To hold acceleration or deceleration, input an ACCELERATION/
DECELERATION HOLD command. The output frequency is main-
tained when an ACCELERATION/DECELERATION HOLD command
is input during acceleration or deceleration.
When the STOP command is input while an ACCELERATION/
DECELERATION PROHIBITION command is being input, the accel-
eration/deceleration hold is released and operation ramps to a stop.
Set a Multi-function Input Selection (n050 to n056) to 16 (acceleration/
deceleration prohibit).
Time Chart for ACCELERATION/DECELERATION HOLD
Command Input
FWD (REV)
RUN command
ACCELERATION/
DECELERATION
HOLD command
Frequency
reference
Output
frequency
FREQUENCY
AGREE
signal
Note: If a FWD (REV) RUN command is input at the same time as an
ACCELERATION/DECELERATION HOLD command, the motor will
not operate. However, if the Frequency Reference Lower Limit (n034) is
set to a value greater than or equal to the Min. Output Frequency (n016),
the motor will operate at the Frequency Reference Lower Limit (n034).
150
Min. Output
Frequency
n016
n091
DC Injection Braking
Time At Startup