Skip Frequency - WEG CFW100 Programming Manual

The parameter P153 defines the voltage level for the braking IGBT actuation, and it must be compatible with the
power supply voltage.
If P153 is set at a level too close to the overvoltage actuation level (F022), it may occur before the braking resistor can
dissipate the motor regenerated energy.
of the dynamic braking according to the model.
Figure 8.10 on page 8-13 shows an example of typical DC braking actuation, where the hypothetical wave shapes
of the voltage on the braking resistor and the DC link voltage can be observed. Thus, when the braking IGBT
connects the link to the external resistor, the DC link voltage drops below the value set by P153, keeping the level
below fault F022.
Braking resistor
voltage (DB)
Steps to enable the dynamic braking:
With the inverter powered down, connect the braking resistor (Refer to the user's manual of the Inverter).
Set P151 at the maximum value: (According to inverter model) to prevent the activation of the DC voltage
regulation before the dynamic braking.
DANGER!
!
Be sure the inverter is OFF and disconnected before handling the electric connections and read
carefully the installation instructions of the user's manual.

8.1.6 Skip Frequency

This inverter function prevents the motor from operating permanently at frequency values in which, for example,
the mechanical system goes into resonance (causing excessive vibration or noises).
P303 - Skip Frequency 1
Table 8.2 on page 8-13
Table 8.2: Dynamic braking actuation range
Input Voltage Input Voltage
110 to 127 Vac 391 to 460 Vdc
200 to 240 Vac 349 to 410 Vdc
380 Vac 621 to 800 Vdc
400 to 415 Vac 646 to 800 Vdc
440 to 460 Vac 716 to 800 Vdc
480 Vac 747 to 800 Vdc
DC Link Voltage (U
P153
Rated U
d
U
d
Figure 8.10: Dynamic braking actuation curve
contains the adjustment ranges for the actuation
P0153 (factory default)
395 Vdc
365 Vdc
800 Vdc
800 Vdc
800 Vdc
800 Vdc
) (P004)
d
F022 - overvoltage
Dynamic braking
actuation
Time
U
d
Time
MOTOR CONTROL
Micro Mini Drives | 8-13
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