WEG CFW300 V1.3X, Programming Manual

Page: 85 / 157

Functions Common to All the Control Modes
CFW300 | 11-5
11
U
d
rated
DC Link voltage (P004)
F022-overvoltage
DC Link regulation
Time
Time
U
d
P151
Output
frequency
Figure 11.3: Example graph of DC Link voltage limitation - Ramp Hold
U
d
rated
DC Link voltage (P004)
F022-overvoltage
DC Link regulation
Time
Time
U
d
P151
Output
frequency
Figure 11.4: Example graph of the DC Link voltage limitation - Accelerate Ramp
Like in the DC Link voltage regulation, the output current regulation also has two operating modes: "Ramp Holding"
(P150 = 2 or 3) and "Decelerate Ramp" (P150 = 0 or 1). Both actuate limiting the torque and power delivered to the
motor, so as to prevent the shutting down of the inverter by overcurrent (F070). This situation often occurs when
a load with high moment of inertia is accelerated or when short acceleration time is programmed.
11.2.3 Output Current Limitation by "Ramp Hold" P150 = 2 or 3
„
It prevents the motor from collapsing during torque overload in the acceleration or deceleration.
„
Actuation: if the motor current exceeds the value set in P135 during acceleration or deceleration, the frequency
will not be incremented (acceleration) or decremented (deceleration). When the motor current reaches a value
below P135 the motor accelerates or decelerates again. Refer to
Figure 11.5 on page 11-6 .
„
It has a faster action than the "Decelerate Ramp" mode.
„
It acts in the motorization and regeneration modes.