4-157
(4) Set the pre-excitation time (07-37) based on the electrical time constant T2
07- 38 Pre-excitation level
Range 【50~200】%
(1) Use the pre-excitation initial level (07-38) to provide a higher excitation current during the
pre-excitation time (07-37), which will increase the speed and stability for motors.
(2) In order to quickly magnetize the motor, reduce the pre-excitation time (07-37) and set the
pre-excitation level (07-38) to a high level.
(3) If 07-38 is set greater than 100%, providing a high excitation current during the pre-excitation
time (07-37), motor’s magnetization time is shorted. When the setting reaches 200%,
magnetization is reduced by roughly half.
(4) A high pre-excitation level (07-15) might result in excessive motor sound during pre-excitation.
(5) When the flux reaches 100%, pre-excitation current reverts back to 100% and pre-excitation is
completed, refer figure 4.3.62。
Figure 4.3.62 Pre-excitation operation
07- 39 Short-Circuit Braking Time of PM Motor Speed Search Function
Range 【0.00~100.00】Sec
07- 40 DC injection Braking Time of PM Motor Speed Search Function
Range 【0.00~100.00】Sec
If the motor speed lower than inverter control speed, inverter can stop the motor by parameter
07-39 and 07-40 and restart. If the motor speed higher than inverter control speed, inverter will
be started by actual speed, no matter the setting value of parameter 07-39 and 07-40.
07- 45 STP2 Function Selection
Range
【0】：STP2 is enabled
【1】：STP2 is disabled
If STP2 is enabled, when 00-02=1 and external operation signal is tripped, keypad will display
“Terminal STOP” error when stop command comes from keypad.
If STP2 is disabled, when 00-02=1 and external operation signal is tripped, keypad will not
display “Terminal STOP” error when stop command comes from keypad.
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