5.9 n: Special Adjustments
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual 243
Parameter Details
5
n n8-84: Polarity Judge Current
Sets the current to determine polarity for the initial polarity calculation as a percentage of the motor rated current (E5-
03).
Note: This parameter is available when in AOLV/PM or CLV/PM control mode.
The drive determines motor polarity at motor start when using AOLV/PM (A1-02 = 6), and at power up when using CLV/PM
(A1-02 = 7).
The integrated current deviation during judging polarity (U6-57) has been provided to check if the initial polarity estimation is
correct or not.
To prevent error when determining motor polarity, make sure that the value displayed in monitor U6-57 is greater than 819. If the
value in U6-57 is less than 819, then increase the current used to determine motor polarity using parameter n8-84.
u n9: Hardware Settings
Using these parameters, the drive output voltage can be adjusted.
n
n9-10: AVR Time Constant
Sets the delay time constant that is used to adjust the output voltage when the DC bus voltage changes.
n
n9-12: On-Delay Compensation Time
Sets the time value used for IGBT On-delay compensation.
n
n9-62: On-Delay Compensation Derating Start Frequency
Sets the frequency at which the drive begins to compensate the output voltage for the IGBT On-Delay.
n
n9-63: On-Delay Compensation Disable Frequency
When operating a high-speed motor at low speeds, n9-62 sets the frequency at which the drive stops compensating the
switching delay in the DC bus.
No. Name Setting Range Default
n8-84 Polarity Judge Current 0 to 150% 100%
No. Name Setting Range Default
n9-10 AVR Time Constant 0.0 to 100.0 ms 1.0 ms
No. Name Setting Range Default
n9-12 On-Delay Compensation Time
0.00 to 20.00
μs
Determined by
o2-04
No. Name Setting Range Default
n9-62 On-Delay Compensation Derating Start Frequency 0.0 to [E1-04] Hz 60.0 Hz
No. Name Setting Range Default
n9-63 On-Delay Compensation Disable Frequency 0.0 to [E1-04] Hz 120.0 Hz
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