Dc Link Voltage And Output Current Limitation - WEG CFW501 V1.8X Programming Manual

P0105 – 1 / 2 Ramp Selection
st nd
Adjustable 0 = 1
Range: 1 = 2
2 = DIx
3 = Serial/ USB
4 = SoftPLC
Properties:
Access groups
I/O
via HMI:
Description:
It defines the command origin source to activate the 2
Note: Parameter P0680 (Logical Status) indicates if the 2
parameter, refer to section 7.3 CONTROL WORD AND INVERTER STATUS on page
NOTE!
The inactive status of any of the active sources activates the 1
(DIx) and there is no digital input for the 2
P0106 – Time of the 3
Adjustable 0.1 to 999.0 s
Range:
Description:
Acceleration time from zero to maximum speed (P0134) or deceleration from maximum speed (P0134) to zero
when the 3 Ramp is active.
rd

11.2 DC LINK VOLTAGE AND OUTPUT CURRENT LIMITATION

The DC Link voltage and output current limitation are protection functions of the inverter which act on the ramp
control according to the P0150 options, aiming at containing the voltage increase in the DC link and output current.
In this way, the following of the reference by the ramp is blocked and the output speed follows the 3
P0133 or P0134.
When the DC link voltage is too high, the inverter may freeze the deceleration ramp or increase the output speed
in order to contain this voltage. On the other hand, when the output current is too high, the inverter may decelerate
or hold the acceleration ramp in order to reduce this current. Those actions prevent the occurrence of faults F0022
and F0070, 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.
There are two modes to limit the DC link voltage during the motor braking: "Ramp Holding" (P0150 = 0 or 2) and
"Accelerate Ramp" (P0150 = 1 or 3). Both actuate limiting the braking torque and power, so as to prevent the
shutting down of the inverter by overvoltage (F0022). This situation often occurs when a load with high moment
of inertia is decelerated or when short deceleration time is programmed.
NOTE!
The inverter protection functions use the 3
deceleration.
Ramp
st
Ramp
nd
Ramp
rd
Functions Common to all the Control Modes
Ramp.
nd
Ramp is active or not. For further information on this
nd
ramp. The same occurs in option 2
st
ramp.
nd
ramp defined by P0106 for both acceleration and
rd
Factory 2
Setting:
7-10.
Factory 5.0 s
Setting:
ramp for
rd
CFW501 | 11-3
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