Yaskawa A1000 AC Drive - Manual (Page 11)

2 Overvoltage Suppression A1000 Custom Software
YASKAWA TM.A1000SW.062 Overvoltage Suppression A1000 Custom Software Supplement 11
„ OV Regulator Gain Increase Function
Parameters P1-08 (OV Regulator Gain Frequency) and P1-09 (OV Regulator Gain Multiplier) automatically increase the
overvoltage suppression regulator gain when the drive's output is above the motor base frequency (E1-06). This is
sometimes necessary to compensate for the motor's reduced torque characteristics above its base speed (otherwise known
as the constant horsepower or field weakening area). Figure 2. below is an example when P1-08 = 90.00 Hz, and
P1-09 = 2.000.
Figure 2
Figure 2 OV Regulator Gain Multiplier Above Motor Base Speed
„ Belt Break Detection
If the drive's output frequency is at maximum frequency (with a 1 Hz bandwidth) for more than 30 continuous seconds,
the drive will assume that the belt or coupling between the motor and the machinery has become disconnected. The drive
will fault on a belt-break fault (B-BRK), energize the fault contacts (MA, MB, and MC), and coast to stop.
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