YASKAWA E7U Programming Manual page 112

L3-04 Stall Prevention Selection During Decel
Setting
0 Disabled
1 General Purpose (factory default)
2 Intelligent
3 Stall prev w/R
The stall prevention during deceleration function adjusts the deceleration time in order to prevent OV fault trips during
deceleration. If L3-04= "0: Disabled", stall prevention is disabled and if the load is large and the deceleration time short
enough the Drive may fault and stop.
If L3-04= "1: General Purpose", then the standard stall prevention function is enabled. If, during deceleration, the DC Bus
voltage exceeds the stall prevention level (see table below), the Drive will discontinue decelerating and maintain speed. Once
the DC Bus voltage has dropped below the stall prevention level, the deceleration will continue down to the Speed Command
level. See figure below.
If L3-01= "2: Intelligent", the intelligent stall prevention is enabled. The active deceleration time is ignored and the Drive will
attempt to decelerate as quickly as possible without causing the DC Bus voltage to exceed the stall prevention level.
The following figure demonstrates acceleration when L3-04= "1 General Purpose".
Output
Frequency
DC Bus
Voltage
L3-05 Stall Prevention Selection During Running
Setting
0 Disabled
1 Decel Time 1 (factory default)
2 Decel Time 2
Description
Table 28 Stall Prevention During Decel
Drive Voltage
240Vac
480Vac
E1-01 ≥ 400Vac
E1-01 < 400Vac
a
Fig. 77 Time Chart for Stall Prevention During Deceleration
Description
Stall Prevention Level during Deceleration
b
Programming 106
(V)
380
760
660
a - Set decel time
b - Decel time is extended
t
380/660/760 Vdc
t
TIME