Regulation; Dc Link Voltage; Dc Link Voltage Limitation By "Ramp Hold" (P150 = 0 Or 2) - WEG CFW100 Programming Manual

P105 - 1st / 2nd Ramp Selection
Range: 0 = 1st Ramp
1 = 2nd Ramp
2 = DIx
3 = Serial/USB
4 = Reserved
5 = CO/DN/DP/ETH
6 = SoftPLC
Description:
It defines the origin source of the command to select between the first and second Ramp.
Note: Parameter P680 (Logical Status) indicates if the 2
parameter, refer to Chapter 11 READ on page

8.1.2 Regulation

The DC link voltage and output current limitation are protection functions of the inverter which act on the ramp
control, aiming at containing the rise of voltage on the DC link and of the output current. In this way, the following
of the reference by the ramp is blocked and the output frequency follows the Emergency Ramp for a preset safety
value.
When the DC link voltage is too high, the inverter may freeze the deceleration ramp. On the other hand, when
the output current is too high, the inverter may decelerate or freeze the acceleration ramp in order to reduce this
current. Those actions prevent the occurrence of faults F022 and F070, respectively.
Both protections normally occur at different moments of the inverter operation, but in case of occurrence at the
same time, by definition, the DC link limitation has higher priority than the output current limitation.
The voltage limitation on the DC link during braking actuates limiting the braking power and torque, so as to prevent
the shutting down of the inverter for overvoltage (F022). This situation often occurs when a load with high moment
of inertia is decelerated or when short deceleration time is programmed.
P150 - DC/LC Regul. Type
Range: 0 = hold_Ud and decel_LC
1 = accel_Ud and decel_LC
2 = hold_Ud and hold_LC
3 = accel_Ud and hold_LC
Properties: cfg, V/f, VVW
Description:
P150 configures the behavior of the ramp for the limitation functions of the DC Link Voltage and Current Limitation.
In those cases, the ramp ignores the reference and takes an action of accelerating (accel), decelerating (decel) or
freezing (hold) the normal path of the ramp. That occurs because of the limit pre-defined in P151 and P135 for the
DC Link (Ud) Limitation and for Current (LC) Limitation, respectively.

8.1.2.1 DC Link Voltage

The voltage limitation of the DC Link may work in two ways:

8.1.2.1.1 DC Link Voltage Limitation by "Ramp Hold" (P150 = 0 or 2)

It has effect during deceleration only.
nd
Ramp is active or not. For further information on this
11-1.
MOTOR CONTROL
Micro Mini Drives | 8-3
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