4-127
Figure 4.3.61 Coast to stop with timer
07- 13
Low voltage detection level
Range
【
220V】: 150~210V
【
440V】: 300~420V
07- 25
Low voltage detection time
Range
【0.00~1.00】Sec
Low voltage detection (07-13).
Adjust the 07-13 voltage level from 150 to 210 Vdc ( for type of 220 V level ), or from
300 to 420 Vdc (for type of 440V level) When the voltage is lower than the 07-13 set
value (setting value of 07-13/ 1.414 is the AC voltage detection level) and time
exceeds the setting value of 07-25, low-voltage error "UV" will act.
For 07-25 = 0.00s, and once the voltage is detected too low, UV will act.
07-25 parameter is only valid in version 1.3 or later.
Set preventive measures:
①
. The inverter input voltage will limit the output voltage. If the voltage drops
excessively much, or if the load is too great, the motor may stall.
②
. If the input voltage drops below the setting value of 07-13 and the output is
cut off momentarily, it will not automatically start when power is restored.
07- 14
Maximum pre-excitation time
Range
【
0.00~10.00】Sec
07- 15
Pre-excitation level
Range
【
100~200】%
If a high starting torque is required before the machine operates, especially for a large
capacitor motors, the pre-excitation operation can be used to produce the motor flux.
(1) Pre-excitation time (07-14)
. When the operation command (forward or reversal) is input, the inverter will execute
pre-excitation automatically based on the time set by 07-14.
. As Figure 4.3.62 shows, after the flux reaches 100%, set pre-magnetizing time. The
time that the flux requires is the function value of motor’s electrical time constant.
. Electrical time constant（quadratic by-pass circuit time sonstant ） can be calculated
by motor parameter setting (group 02)
Time
Time
Output frequenc
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