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4-193
OVP
Deceleration
Time
00-24
(Tdec 4)
00-22
(Tdec 3)
700V
750V
OVP
Deceleration
Start (11-38)
OVP
Deceleration
Stop (11-39)
DC bus
voltage
Figure 4.3.92 OVP deceleration time
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). Enable the OVP function with parameter 11-40 set to 1 or 2. The following parameter default values will be
changed when the OVP function is enabled:
07-09=1 (Stop mode: coast to stop)
00-14(Tacc1) = 5.0 Sec (the frequency reference acceleration rate when DC voltage is too high.)
00-22(Tdec3) = 20.0 Sec (low setting point of OVP deceleration rate).
00-24(Tdec4) = 100.0 Sec (high setting point of OVP deceleration rate).
Note:
S curve should be disabled when using the OVP function (11-04~11-07=0.0sec).
11-40=2:
OV prevention Mode 2
This mode is similar to OV prevention mode 1 but uses frequency gain of OV prevention 2 (11-28) in combination
with the accel/decel times, see Fig. 4.4.91 and 4.4.92 for additional information.
11-40=3:
OV prevention Mode 3
In this mode the inverter will raise the output frequency temporarily to avoid an OV condition; the output frequency
will not go higher than the value of 01-02 (Maximum Output Frequency of Motor 1). Please adjust the value of
01-02 according to application. Raise the value of 11-64 in 0.1 increments if an OV condition still occurs when
11-40=3 is selected.