Specifications

YASKAWA Inverter Drive A1000 – Crane Software Application Manual
57
Appendix I. Tuning Procedures
In this section, the tuning procedures for different operational situations are described.
Tuning During No-Load Testing
(1) There is fluctuation when hoisting
Increase the AFR Gain (n2-01). This parameter should be increased very gradually to reduce fluctuation. It is normally
set between 1.0 and 2.0.
(2) There is fluctuation when lowering
Gradually increase the Brake Release Frequency REV (S1-02) and the Brake Delay Frequency (S1-03). Note that S1-02
must always be less than or equal to S1-03. The recommended maximum setting for S1-03 is 3.0 Hz. It may also be
necessary to gradually increase the AFR Gain (n2-01).
Tuning when Testing at Rated Load
(1) At Stop, the load seems as if it may fall even though the brake is clamped shut
Adjust the brake sequence when stopping. This may require the modification of the FWD or REV Brake Hold Frequency
(S1-12, -13), the Slip Prevention Frequency (S1-14) and/or the Slip Prevention Time (S1-15).
(2) The load slips
If the load slips or drops unexpectedly at start or stop, it may be necessary to modify the V/f pattern and/or the Torque
Compensation parameter (S1-09) in order for the drive to produce enough torque to hold the load. Torque Compensation
(S1-09) should be increased gradually and V/f parameters should be set as follows:
V/f Control Mode
E1-04 (F
max
) = Motor Max Output Frequency
E1-05 (V
max
) = Motor Rated Voltage
E1-06 (F
base
) = Motor Base Frequency
E1-07 (F
a
) = Minimum Frequency to Obtain Required Torque
E1-08 (V
b
) = Minimum Voltage to Obtain Required Torque
E1-09 (F
min
) = Up to 1.5 Hz
E1-10 (V
min
) =
()
()
()
maxmin
max
VFF
FF
VV
base
abase
b
+−×
−
−
E1-11,-12,-13 = Default Value
C4-01 (KT) = 0.0
When motor data is unknown, use the following values for the V/f pattern:
E1-04 through -7 = Default Values
E1-08 (V
b
) = Default Value + (5 to 10 V)*
E1-09 (F
min
) = Default Value
E1-10 (V
min
) = Default Value + (5 to 10 V)*
C4-01 (KT) = 1.0
* Increase the setting gradually. Double these values when using a 400 V Class drive.
Open Loop Vector (OLV) Control Mode