.Set the pre-excitatin time (07-14) base on the electrical time constant T2
(2) Pre-excitation initial level (07-15)
. Use the the pre-excitation initial level (07-15) to provide a higher excitation current
within the pre-excitation time (07-14), which will increase the speed and stability for
motors.
. In order to quickly create magnetic flux, reduce the pre-excitation time (07-14) and
set the pre-excitation level (07-15) at the high point.
. If 07-15 is set higher than 100%, providing a high excitation current in the period of
the pre-excitation time (07-14), motor’s internal flux establishment time can be
shorten. When the setting reaches 200%, the flux establishment time can be
reduced by about a half.
. If the pre-excitation level (07-15) is set to a higher value, motor might generate
great noise during pre-excitation.
.When 100% of the flux has been established and the pre-excitation current backs to
100%, the pre-excitation is completed. Please refer to the following figure 4.3.62.
Figure 4.3.62 Pre-excitation operation
07- 18
Minimum base block time
Range
【
0.1~5.0】Sec
For the momentary power failure, the inverter continues to operate after the power is
restored (07-00 = 1); therefore the command must always exist. Failure signal will be
output by the contacts.
.Once the momentary power failure is detected; the inverter will automatically shut down
the output and maintain B.B for a set time. If the set time is 07-18, the residual voltage is
expected to almost zero.
. When the momentary power failure time exceeds the minimum base block time (07-18),
it immediately starts operation after the speed search. Please refer to the following figure
4.3.63.
To Next Page
Loading...
