WEG CFW-11 Programming Manual page 88

Scalar Control (V/f)
Description:
It is the current limitation for the V/f control with actuation mode defined by P0344 (refer to the table 9.1) and the
current limit defined by P0135.
P0344
0 = Hold - FL ON
1 = Decel. - FL ON
2 = Hold - FL OFF
3 = Decel.- FL OFF
Current limitation of the "Ramp Hold" type:
 It avoids the stalling of the motor during a torque overload at the acceleration or at the deceleration.
 Working: if the motor current exceeds the value adjusted in P0135 during the acceleration or the
deceleration, the speed will no longer be increased (acceleration) or decreased (deceleration). When the
motor current reaches a value below P0135 the motor will again accelerate or decelerate. Refer to the
figure 9.9(a).
 It acts faster than the "Ramp Deceleration" mode.
 It acts in the motorization and braking modes.
Current limitation of the "Ramp Deceleration" type:
 It avoids the stalling of the motor during a torque overload at the acceleration or at constant speed.
 Working: if the motor current exceeds the value adjusted in P0135, the input of the speed ramp is set
to zero forcing a deceleration. When the motor current reaches a value below P0135 the motor will
accelerate again. Refer to the figure 9.9(b).
Fast current limitation:
 It reduces the inverter output voltage instantaneously when the motor current reaches the value of
1.9xI
nomHD
9
9-8
Table 9.1 - Current limitation configuration
Function
Current limitation of the "Ramp Hold" type
Active fast current limitation
Current limitation of the "Ramp Deceleration" type
Active fast current limitation
Current limitation of the "Ramp Hold" type
Inactive fast current limitation
Current limitation of the "Ramp Deceleration" type
Inactive fast current limitation
.
Description
Current limitation according to the figure 9.9(a)
Fast current limitation at the value 1.9 x I
Current limitation according to the figure 9.9(b)
Fast current limitation at the value 1.9 x I
Current limitation according to the figure 9.9(a)
Current limitation according to the figure 9.9(b)
active
nomHD
active
nomHD