11
12
13
14
15
16
17
18
19
20
447
16. (G) Control Parameters
16.9 Regeneration avoidance function
NOTE
• The slope of frequency rising or lowering by the regeneration avoidance operation will change depending on the regenerative
status.
• The DC bus voltage of the inverter will be approximately
times of the normal input voltage.
The bus voltage is approx. 311 VDC at an input voltage of 220 VAC (622 VDC at 440 VAC and 813 VDC at 575 VAC).
However, it may vary depending on the input power supply waveform.
• Make sure that the setting value of
Pr.883
will not get under DC bus voltage level. The frequency will rise with operation of the
regeneration avoidance function even during operation other than the regenerative operation.
• The stall prevention (overvoltage) (OLV) will be activated only during deceleration, stopping the lowering of output frequency.
On the other hand, the regeneration avoidance function will be activated constantly (
Pr.882
= "1") or only at constant speed
(
Pr.882
= "2"), and raise the frequency depending on the amount of regeneration.
• When the motor becomes unstable due to the stall prevention (overcurrent) (OLC) during the regeneration avoidance
operation, increase the deceleration time or set a lower value in
Pr.883
.
Limiting the regeneration avoidance operation frequency (Pr.885)
• It is possible to assign a limit to the output frequency corrected (rise) by the regeneration avoidance operation.
• Limit of the frequency is output frequency (frequency before regeneration avoidance operation) +
Pr.885 Regeneration
avoidance compensation frequency limit value
for during acceleration and constant speed. During deceleration, when
the frequency increases due to the regeneration avoidance operation and exceeds the limit value, the limit value will be
retained until the output frequency is reduced to be the half the
Pr.885
setting.
• When the frequency that have increased by the regeneration avoidance operation exceeds
Pr.1 Maximum frequency
, it
will be limited to the maximum frequency.
• When
Pr.885
= "9999", the regeneration avoidance compensation frequency limit is disabled.
• Set the frequency around the motor rated slip frequency. Increase the setting value if the overvoltage protection function
(E.OV[]) is activated at the start of deceleration.
Adjusting the regeneration avoidance operation (Pr.665, Pr.886)
• If the frequency becomes unstable during regeneration avoidance operation, decrease the setting of
Pr.886 Regeneration
avoidance voltage gain
. On the other hand, if an overvoltage fault occurs due to a sudden regeneration, increase the
setting.
• If setting a smaller value in
Pr.886
does not suppress the vibration, set a smaller value in
Pr.665 Regeneration avoidance
frequency gain
.
√
2
Synchronized speed at the time of base frequency – rated rotation speed
Synchronized speed at the time of base frequency
× Rated motor frequency
Rated motor slip frequency
=
Limit level
Time
Pr.885
Output frequency (Hz)
Pr.885
/2
Output
frequency(Hz)
Содержание FR-E800
Страница 17: ...16 1 Introduction 1 3 Related manuals MEMO ...
Страница 51: ...50 2 Basic Operation 2 8 I O terminal function assignment MEMO ...
Страница 89: ...88 3 Parameters 3 4 Parameter list by function group number MEMO ...
Страница 135: ...134 5 Speed Control 5 9 Troubleshooting in the speed control MEMO ...
Страница 153: ...152 6 Torque Control 6 7 Troubleshooting in torque control MEMO ...
Страница 195: ...194 8 E Environment Setting Parameters 8 18 Current average value monitor signal MEMO ...
Страница 237: ...236 10 D Operation Command and Frequency Command 10 6 Operation by multi speed setting MEMO ...
Страница 339: ...338 13 T Multi Function Input Terminal Parameters 13 9 Start signal operation selection MEMO ...
Страница 455: ...454 16 G Control Parameters 16 13 Speed smoothing control MEMO ...
Страница 481: ...480 18 Appendix 18 4 Parameters functions and instruction codes under different control methods MEMO ...