4-189
(3) When the inverter is stopped, the deceleration rate can be set with parameter 00-15(Tdec1). In
case the DC voltage is too high, the inverter will decelerate based on the OVP deceleration time
as shown in figure 4.3.92
Set DC-bus voltage in parameter 11-38 (start voltage of OVP deceleration) and set OVP
deceleration rate in 00-22 (Tdec3).
When the DC voltage reaches this level, it is necessary to decelerate rapidly in order to
prevent the delta DC voltage of becoming too large.
When DC voltage reaches the setting of 11-39 (stop voltage of OVP deceleration), it will
decelerate based on the set value of 00-24 (Tdec4)
Deceleration rate is linear based on the slope defined by the start point (11-38) and end
point (11-39).
(4) Parameter 11-40 can enable and disable the OVP function, when 11-40=1, some functions will
go back to default setting.
00-14(Tacc1)=5.0 sec (Acceleration speed reference of higher DC voltage)
00-22(Tdec3)=20.0 sec (OVP deceleration lower setting point)
00-24(Tdec4)=100.0 sec (OVP deceleration higher setting point)
11-04=0.0 sec
11-05=0.0 sec (OVP S-curve function needs to disable)
11-06=0.0 sec
11-07=0.0 sec
When 11-40=2：OV prevention Mode 2
The process of OV prevention mode 2 is the same as that of OV prevention mode 1 but it
strengthens more the part of DC BUS over the deceleration stop voltage of OV prevention (11-39) in
Fig.4.3.92. It can accelerate frequency compensation to avoid OV protection by increasing
frequency gain of OV prevention 2 (11-28).
When 11-40=3：OV prevention Mode 3
The inverter raise the output frequency temporarily to avoid OV, the output frequency won’t higher
than 01-02 (Maximum Output Frequency of Motor 1).Please adjust 01-02 according to each
application. If it still occurs “OV” in this mode, please raise the value of 11-17 in 0.1 unit.
(When 11-17 value is higher, the speed and current ripple will be raised.)
11- 47 KEB Deceleration Time
Range
【0.0~25.5】Sec
11- 48
KEB Detection Level
Range
230V :【190~210】V
400V :【380~420】V
KEB function can be used to keep the inverter from tripping on a under voltage condition due to a
momentary power-loss. To enable the KEB function set parameter 11-47 to a value greater than 0.0
sec. Upon detection of a power-loss the inverter uses the KEB deceleration time (11-47) to
decelerate the motor and using the regenerative energy from the motor to maintain the DC-bus at
a nominal level.
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