Yaskawa VS-616G5 Series Revision F Programming Manual - Manual (Page 109)

VS-616G5 Programming Manual 109
If deceleration times are set too short for load conditions, the inverter automatically extends the decel-
eration time according to the main circuit DC bus voltage level. When using an optional braking resis-
tor for the VS-616G5, set parameter L3-04 to ”0”.
Note: Intelligent stall prevention during deceleration (L3-04 = “2”) cannot be set in the vector con-
trol modes (when A1-02 = “2” or “3”).
L3-04 Stall Prevention Selection During Deceleration StallP Decel Sel B B B B
Setting Description
0 Stall prevention during deceleration is disabled. An excessively short deceleration
time will generate an overvoltage fault (OV), and the inverter will stop.
1 Stall prevention during deceleration is enabled (factory default).
The DC bus voltage level is monitored, and the deceleration rate is automatically
extended to prevent an overvoltage condition. This deceleration rate may be longer
than the set value (C1-02).
2 Stall prevention during deceleration is enabled, with an intelligent deceleration mode.
By monitoring DC bus voltage, the deceleration rate is automatically adjusted so that
deceleration can be completed in the shortest amount of time, regardless of the set
deceleration time.
3 Overvoltage (OV) countermeasure during deceleration (with braking resistor
installed). Improves stall prevention during deceleration.
Overvoltage (OV) sometimes occurs even under settings 1 or 2 above. The rising of
the DC bus voltage is limited during fast deceleration of the motor. This feature
allows a faster than normal decel time.
Note: When in vector mode setting 3 cannot be used with braking resistor and with
stall prevention.
Figure 53 Stall Prevention During Deceleration
Frequency
Set Deceleration Time
Time
Adjusts the deceleration time to
prevent overvoltage fault (OV).
Section L: Protection Parameters
L3 Stall Prevention / Current Limit