Specifications

YASKAWA Inverter Drive A1000 – Crane Software Application Manual
58
Perform Auto Tuning first. If load still slips, modify as follows.
E1-04 through -7 = Default Values
E1-08 (V
b
) = Default Value + (2 to 3 V)*
E1-09 (F
min
) = Default Value
E1-10 (V
min
) = Default Value + (2 to 3 V)*
* Increase the setting gradually. Double these values when using a 400 V Class drive.
In Closed Loop Vector (CLV) control mode, no modification to the V/f pattern is necessary.
(1) There is fluctuation when hoisting or lowering
Gradually increase the Torque Compensation Delay Time parameter C4-02 up to a maximum recommended value of
50ms. AFR Gain (n2-01) may need to be gradually increased, and the AFR Time Constant 1 (n2-02) may need to be
increased if fluctuation occurs when hoisting or decreased if fluctuation occurs when lowering the load.
(2) There is excessive current when hoisting the load just after lowering it
Adjust the Run Command Delay Timer (S2-03) according to the formula in section 7.2.1.
Tuning when Testing at Overload
(1) The load sips when hoisting
Increase the Torque Compensation parameter (S1-09).
Tuning when Acceleration or Deceleration Times (C1-01 through -08) are Modified
When acceleration times are modified, FWD and REV Brake Hold Frequency (S1-12, -13), Slip Prevention Frequency
(S1-14), and Slip Prevention Time (S1-15) may need to be modified.