WEG CFW-11 Programming Manual page 102

Scalar Control (V/f)
Description:
It is the current limitation for the V/f control with actuation mode defined by P0344 (refer to the
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
 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
Fast current limitation:
 It reduces the inverter output voltage instantaneously when the motor current reaches the value of 1.9xI
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
Figure 9.9 on page 9-9
Current limitation according to the
Fast current limitation at the value 1.9 x I
Current limitation according to the
Fast current limitation at the value 1.9 x I
Current limitation according to the
Current limitation according to the
(b).
Table 9.1 on page
Description
Figure 9.9 on page 9-9
active
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Figure 9.9 on page 9-9
active
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Figure 9.9 on page 9-9
Figure 9.9 on page 9-9
Figure 9.9 on page 9-9
9-8)
(a)
(b)
(a)
(b)
(a).
.
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