3.10 Crane Application Setup Procedure
210 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
No. Adjustment Method
S4-19
1. When there is no load, the drive will operate in the forward direction using the frequency reference set in S4-06 along with the monitor U1-09
[Torque Reference].
2. Set the reverse value of U1-09 in S4-19.
3. Adjust S4-04 while monitoring U4-15 [Torque Ref@UL1].
S4-20
1. When there is no load, the drive will operate in the reverse direction using the frequency reference set in S4-06 along with the monitor U1-09
[Torque Reference].
2. Set the reverse value of U1-09 in S4-20.
3. Adjust S4-05 while monitoring U4-15 [Torque Ref@UL1].
Note:
1. Set the parameters to satisfy the following conditions.
• S4-06 ≤ S4-02
• S4-03 ≤ E1-04 [Maximum Output Frequency]
For motor 2, S4-03 ≤ E3-04 [Motor 2 Maximum Output Frequency]
2. If S4-02/S4-03 < S4-06, the motor will decelerate once Light-load Acceleration 1 is triggered.
3. After Light-load Acceleration, the drive will operate at the frequency reference or the value set in S4-02/S4-03, whichever is smaller.
◆ Light-load Acceleration 2 Function
Light-load Acceleration 2 has the drive automatically determine if it should accelerate up to the frequency
reference input to the drive.
If the motor acceleration time is too short and if there is not enough headroom in the motor rated output for what
is needed to accelerate within the designated acceleration time, then the drive will automatically extend the
acceleration time or simply stop accelerating. This allows for efficient operation while also protecting the load
(mainly the braking mechanism).
When enabling Light-load Acceleration 2, enter the target frequency reference (the desired acceleration speed).
Determine the speed according to following criteria to optimize control.
Output power = Power required for acceleration + Load power
Note:
• By calculating the output power according to the formula above, the drive will extend the acceleration time so that it remains within the
drive rated output range, thus operating with minimal impact on the drive acceleration ability.
• Determines the output frequency while monitoring motor output.
• Operation Conditions
• Target Motor Speed Calculation
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