Yaskawa A1000 AC Drive - Manual (Page 7)

2 Overvoltage Suppression A1000 Custom Software
YASKAWA TM.A1000SW.062 Overvoltage Suppression A1000 Custom Software Supplement 7
‹ Changes from Standard Product
• Several parameter defaults are changed.
• The Stationary auto-tuning method (T1-01 = 1) will not set E2-02 (Rated Slip) and E2-03 (No-load Current). Therefore,
these parameters must be manually set using the motor's nameplate data.
‹ Limitations
• V/f and Open Loop Vector are the only control modes (A1-02 = 0 or 2) that support the OV Suppression function.
Closed Loop V/f and Closed Loop Vector are available (A1-02 = 1 or 3) but the OV Suppression function is disabled.
• The "Ramp to Stop" stopping method (b1-03 = 0) is deleted.
• When reverse operation is prohibited (b1-04 = 1) and the motor is moving in the reverse direction, OV Suppression is
disabled (This condition can occur due to a bi-directional speed search).
• OV Suppression cannot be used to shorten deceleration time on applications with large loads.
• Torque Ramp during Start is only active in Open Loop Vector control mode (A1-02 = 2).
‹ Precautions
NOTICE: The OV Suppression function (P1-01 = 1) should not be used in conjunction with standard drive OV Suppression function
(L3-11 = 1) as it may cause unstable operation.
NOTICE: The motor connected to a drive with this software on it needs to be mechanically capable of operation at the maximum
allowed frequency (Parameter E1-04).
Note: The Overvoltage Suppression feature works best in Open Loop Vector (A1-02 = 2), only AFTER a full Rotational auto-tune is
performed (T1-01 = 0). If a Rotational auto-tune cannot be performed, a Stationary auto-tune can be performed (T1-01 = 1). You
must manually set E2-02 (Rated Slip) and E2-03 (No-load Current) from the motor's nameplate data before running the auto-tune
as the Stationary auto-tuning method will not tune these parameters in this software. If performance is not achieved after the
Stationary auto-tune, use the V/F control mode (A1-02 = 0) instead.
Note: The Overvoltage Suppression function is NOT active when the output frequency is at the maximum output frequency (E1-04).
This is because the function needs frequency headroom to work.
‹ Related Parameters and Functions
The legend below is used in this section to indicate which parameters are available in which control modes.
The parameter tables in this section are used to set up the drive for operation with the software.
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