WEG CFW501 V1.8X, Programming Manual, Page: 101 / 192

Functions Common to all the Control Modes
CFW501 | 11-7
11
U
d
rated
DC link voltage (P0004)
F0022-
Overvoltage
DC link
regulation
Time
Time
U
d
P0151
Output
speed
Figure 11.5: Example graph of the DC ling voltage limitation – Accelerate Ramp (P0152 = 1 or P0152 = 3)
Like in the DC link voltage regulation, the output current regulation also has two operating modes: “Ramp
Holding” (P0150 = 2 or 3) and “Decelerate Ramp” (P0150 = 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 (F0070). 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” P0150 = 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 P0135 during acceleration or deceleration, the speed
will not be incremented (acceleration) or decremented (deceleration). When the motor current reaches a value
below P0135, the motor accelerates or decelerates again. Refer to
Figure 11.6: (a) and (b) Actuation modes of
current limitation via P0135 on page 11-8 .
„
It has a faster action than the “Decelerate Ramp” mode.
„
It acts in the motorization and regeneration modes.
11.2.4 Current Limitation Type “Decelerate Ramp” P0150 = 0 or 1
„
It prevents the motor from collapsing during torque overload in the acceleration or constant speed.
„
Actuation: if the motor current exceeds the value set in P0135, a null value is forced for the speed ramp input
forcing the motor deceleration. When the motor current reaches a value below P0135, the motor accelerates
again. Look at
Figure 11.6: (a) and (b) Actuation modes of current limitation via P0135 on page 11-8 .