LSIS G100, Operation Manual

Page: 152 / 343

Problem
Relevant
Function Code
Troubleshooting
If torque is lacking due
to a load increase in
low speed (5 Hz or
less)
Cn.21 Out Trq.
Comp. Gain at
Low Spd
If torque is lacking under low speed, increase
the Cn.21 value in 5% units.
If rotating in reverse
direction due to a load
increase in low speed
(5 Hz or less)
Cn.21 Out Trq.
Comp. Gain at
Low Spd If rotating in reverse direction due to a load
increase in low speed, decrease the Cn.21
value 5% at a time.
If low speed (3 Hz or
less) out-of-phase
occurs because the
inertia of load is high.
Cn.30 Spd.
Response
Adjustment Gain Sometimes control is not possible under a low
speed due to high load inertia. In this case,
increase the Cn.30 value by 1 unit at a time.
If motor rotation count
error margin occurs
during no load Cn.29 Spd.
Comp. Gain at
No-load
If over 10 RPM of motor rotation count error
occurs during no load operation, adjust the
Cn.29 value by 0.01 unit at a time.
If speed response is
required
Cn.30
Spd.Response
Adjustment Gain
Although the speed response is improved the
greater the Cn.30 value, speed control may
become unstable. Excessive setup may cause
an inverter trip.
5.11 Energy Buffering Operation (Kinetic Energy
Buffering)
When the input power supply is disconnected, the inverter’s DC link voltage
decreases, and a low voltage trip occurs blocking the output. A kinetic energy
buffering operation uses regenerative energy generated by the motor during the
blackout to maintain the DC link voltage. This extends the time for a low voltage trip to
occur, after an instantaneous power interruption. For the KEB feature to operate
properly, bA-19 input power voltage parameter must be set to match the voltage of