Output Current Limitation By "Ramp Hold" P150 = 2 Or 3; Current Limitation Type "Decelerate Ramp" P150 = 0 Or 1 - WEG CFW100 Programming Manual

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
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" P150 = 0 or 1:

It prevents the motor from collapsing during torque overload in the acceleration or constant frequency.
„
Actuation: if the motor current exceeds the value set in P135, a null value is forced for the frequency ramp input
„
forcing the motor deceleration. When the motor current reaches a value below P135 the motor accelerates
again. Look at Figure 11.5 on page
Functions Common to All the Control Modes
U DC link voltage (P004)
d
P151
U rated
d
Output
frequency
Figure 11.3: Example graph of DC link voltage limitation – Ramp Hold
DC link voltage (P004)
U
d
P151
U rated
d
Output
frequency
11-6.
Return
F022-overvoltage
DC Link regulation
Time
Time
F022-overvoltage
DC Link regulation
Time
Time
Figure 11.5 on page
Advance
11-6;
CFW100 | 11-5
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