Operating Instructions

Descriptions of Parameter Settings
Descriptions of Parameter Settings
185 | 443
Pr.
Explanation
Settings
Default
07-05
Voltage increasing gain
1 to 200%
100
When using speed tracking, adjust Pr.07-05 to slow down the increasing voltage gain if there are errors such as oL
or oc; however, the speed tracking time will be longer.
Pr.
Explanation
Settings
Default
07-06
Restart after momentary power
loss
0: Stop operation
1: Speed tracking by the speed before the power loss
2: Speed tracking by the minimum output frequency
0
● Determines the operation mode when the drive restarts from a momentary power loss.
● The power system connected to the drive may power off momentarily for many reasons. This function allows
the drive to keep outputting voltages after the drive is repowered and does not cause the drive to stop.
● 1: Frequency tracking begins before momentary power loss and accelerates to the master Frequency
command after the drive output frequency and motor rotator speed are synchronous.
● Use this setting when there is a lot of inertia with little resistance on the motor load. For example, in equipment
with a large inertia flywheel, there is no need to wait until the flywheel stops completely after a restart to
execute the operation command; therefore, it saves time.
● 2: Frequency tracking starts from the minimum output frequency and accelerates to the master Frequency
command after the drive output frequency and motor rotator speed are synchronous. Use this setting when
there is little inertia and large resistance.
● In PG control mode, the AC motor drive executes the speed tracking function automatically according to the PG
speed when this setting is NOT set to 0.
Pr.
Explanation
Settings
Default
07-07
Allowed power loss duration
0.0 to 20.0 sec.
2.0
● Determines the maximum time of allowable power loss. If the duration of a power loss exceeds this parameter
setting, the AC motor drive stops output after the power recovers.
● Pr.07-06 is valid when the maximum allowable power loss time is ≤ 20 seconds and the AC motor drive
displays LU. If the AC motor drive is powered off due to overload, even if the maximum allowable power loss
time is ≤ 20 seconds, Pr.07-06 is invalid after the power recovers.
Pr.
Explanation
Settings
Default
07-08
Base Block time
0.0 to 60.0 sec.
0.5
When momentary power loss is detected, the AC motor drive blocks its output and then waits for a specified period
of time (determined by Pr.07-08, called Base Block Time) before resuming operation. Set this parameter to the time
that allows the residual voltage at the output side to decrease to 0V before activating the drive again.