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N700E INSTRUCTION MANUAL
3-74
Fine Tuning
1. If satisfactory performance through auto tuning cannot be fully obtained,
adjust the motor constants for the observed symptoms according to the table below.
Symptom
Adjustment
Parameter
At
Motoring
Status
When low frequency
(a few Hz) torque is
insufficient.
Slowly increase the motor constant 1.2 times the
auto tune data.
H08/H10
When the speed
deviation is negative.
Slowly increase the rated motor slip up to 1.5 times
original setting.
H07
When the speed
deviation is positive.
Slowly decrease the rated motor slip down to 0.5
times original setting
H07
When Over current
Fault occurs as the
load is applied
Slowly increase the motor no load current in up to
1.2 times original setting.
H06
At
Regeneration
Status
When low frequency
(a few Hz) torque is
insufficient.
Slowly increase the motor constant R1 1.2 times
the auto tune data
H08/H10
Slowly increase the motor no load current in up to
1.2 times original setting
H06
Decrease the carrier frequency.
b11
2. If the inverter capacity is more than twice the capacity of the motor in setting of A28=1, A31=2, the VFD
may not achieve its full performance specifications.
3. When DC injection braking is enabled (A33 = 1), the motor constant will not be accurately set.
Therefore, disable DC injection braking (A33 = 0) before starting the auto tuning procedure.
4. The motor and load must be stationary before initiating the auto tune.
Auto tuning while the motor is rotating may produce inaccurate results.
5. If the auto tuning procedure is interrupted by the stop command, the auto tuning constants
may be stored in the inverter incorrectly. It will be necessary to reset the inverter to factory defaults
(b12 = 1 *NOTE: This will reset all inverter parameter back to the factory default).