Specifications
YASKAWA Inverter Drive A1000 – Crane Software Application Manual
47
S4-05 Ultra Lift 1 Detection Torque REV (IRAT): Sets the torque threshold in the REV direction at which the drive
determines that there is a light load on the crane and activates the Ultra Lift 1 function. This parameter is set as a
percentage of motor rated torque in vector control modes and as a percentage of motor rated current in V/f control
modes. To find an optimal setting for this parameter the U1-48 monitor for Ultra Lift torque reference can be used.
No. Parameter Name Setting Range Default
S4-04
Ultra Lift 1 Detection Torque FWD 50 %
S4-05
Ultra Lift 1 Detection Torque REV
0 to 200 %
50 %
S4-06 Ultra Lift 1 Detection Frequency (FAD)
: Frequency at which the drive compares its Internal Torque Reference ITR
(vector control) or current output (V/f control) to the Ultra Lift 1 Detection Torque IFAT (IRAT) in order to determine if
there is a light load on the crane and activate the Ultra Lift 1 function. This parameter is usually set to the same value as
the Base Frequency (E1-06).
S4-07 Ultra Lift 1 Detection Time (TA)
: Time interval during which the ITR or output current must not exceed the Ultra Lift
1 Detection Torque IFAT (IRAT) before the Ultra Lift 1 function is activated and the drive is allowed to accelerate. If this
parameter is set too short, the drive may improperly detect the size of the load and output frequency will fluctuate. If set
too long, the crane’s operation time may be lengthened without need.
No. Parameter Name Setting Range Default
S4-06
Ultra Lift 1 Detection Frequency 40.0 to 60.0 Hz 60.0 Hz
S4-07
Ultra Lift 1 Detection Time 0.0 to 10.0 s 1.0 s
S4-19 Ultra Lift 1 Torque Bias FWD
: Sets the value of the mechanical loss of the crane in the FWD direction as a
percentage of motor rated torque. It may be necessary to set this parameter if the Ultra Lift 1 function is not working
properly in Open Loop Vector control mode. A typical value for this parameter can be determined empirically by operating
the crane in the FWD direction without a load
, and setting S4-19 to the opposite value of the U1-09 torque reference
monitor.
S4-20 Ultra Lift 1 Torque Bias REV
: Sets the value of the mechanical loss of the crane in the REV direction as a
percentage of motor rated torque. It may be necessary to set this parameter if the Ultra Lift 1 function is not working
properly in Open Loop Vector control mode. A typical value for this parameter can be determined empirically by operating
the crane in the REV direction without a load
, and setting S4-19 to the opposite value of the U1-09 torque reference
monitor.
No. Parameter Name Setting Range Default
S4-19
Ultra Lift 1 Torque Bias FWD 0.0 %
S4-20
Ultra Lift 1 Torque Bias REV
-50.0 to 50.0 %
0.0 %
Note: These parameters are only available in Open Loop Vector (OLV) control mode.
When setting Ultra Lift 1 parameters, be aware that the following conditions should be met:
• S4-06 (Ultra Lift 1 Detection Frequency FAD) ≤ S4-02 (Ultra Lift 1 Max Frequency FWD FAMF)
• S4-03 (Ultra Lift 1 Max Frequency REV FAMR) ≤ E1-04 (Max Output Frequency)
If FAMF (FAMR) is set to a value lower than FAD, the drive will decelerate when the Ultra Lift 1 function is activated.
Also, if there is a change in motor temperature, an identical load will generate a different torque reference (5 – 7% error)
and this should be taken into account when setting Ultra Lift 1 function parameters.
Ultra Lift 1 Function Operation
(1) When the Ultra Lift 1 function is enabled either through the S4-01 parameter or using a multi-function digital input,
and if the frequency reference is above the value of the Ultra Lift 1 Detection Frequency FAD, the drive will
accelerate up to an output frequency of FAD. After that frequency has been reached, the Ultra Lift 1 Detection Time
TA timer is initiated.
(2) When ⅓ of the TA time has passed, the drive initiates the load check by comparing its torque reference and the
Ultra Lift 1 Detection Torque IFAT (IRAT). If the torque reference stays below the level set to IFAT (IRAT) for the
remaining ⅔ of the Ultra Lift 1 Detection Time TA then the drive will accelerate up to its frequency reference or the
Ultra Lift 1 Max Frequency FAMF (FAMR), whichever is lower.
(3) If the torque reference goes above the level set to IFAT (IRAT) at any point during the remaining ⅔ of the Ultra Lift 1
Detection Time TA, then the drive will continue to run at the Ultra Lift 1 Detection Frequency FAD. Even if the
torque reference decreases at a later time point, the Ultra Lift 1 function will not be activated.
The Ultra Lift 1 function is reset if one of the following actions occurs:
• The Run Command is removed
• The frequency reference falls below the Ultra Lift 1 Detection Frequency
FAD
• The drive faults