WEG CFW501 V1.8X Programming Manual page 74

Available Motor Control Types
P0140 – Sleep Compensation Filter
Adjustable
Range:
Properties:
Description:
Time constant of the filter for slip compensation in the output frequency. You must consider a filter response
time equal to three times the time constant set in P0140 (500 ms).
P0397 – Control Configuration
Adjustable
Range:
Properties:
Description:
The bits of parameter P0397, as shown in
8-3, enable a series of internal options to configure the control of the induction motor, such as:
Slip Compensation during the Regeneration (Bit 0)
„
The regeneration is an operating mode of the inverter which occurs when the power flux goes from the motor to
the inverter. The bit 0 of P0397 (set in 0) allows the slip compensation to be turned off in this situation. This option is
particularly useful when the compensation during the motor deceleration is necessary.
8
Dead Time Compensation (Bit 1)
„
The dead time is a time interval introduced in the PWM necessary for the commutation of the power inverter
bridge. On the other hand, the dead time generates distortions applied to the motor, which can cause torque
reduction at low speeds and current oscillation in motors above 5 HP running with no load. Thus, the dead time
compensation measures the voltage pulse width in the output and compensates this distortion introduced by
the dead time.
Bit 1 of P0397 (set in 0) allows deactivating this compensation. This feature is useful when there is a problem
related to the inverter internal circuit for pulse feedback causing fault F0182. Thus, the compensation, and
consequently the fault, can be disabled.
Output Current Stabilization (Bit 2)
„
High-performance motors with power above 5 HP are marginally stable when driven by frequency inverters and
at operation with no load. Therefore, in this situation a resonance may occur in the output current which may
reach the overcurrent level F0070. Bit 2 of P0397 (set to 1) activates an algorithm for regulation of the output
current in closed loop which neutralizes the oscillations of resonant output current.
Reduction of P0297 at high temperature (Bit 3)
„
Bit 3 of P0397 controls the overtemperature protection action according to
OVERTEMPERATURE PROTECTION (F0051 AND A0050) on page
ATTENTION!
The default setting of P0397 meets most application needs of the inverter.
Therefore, avoid modifying its content without knowing the related consequences. If you are not
sure, contact WEG Technical Assistance before changing P0397.
8-2 | CFW501
0 to 9999 ms
V V W
0000h to 000Fh
cfg
Table 8.1: Options available to configure the control (P0397) on page
Factory
Setting:
Factory
Setting:
section 14.4 IGBTS
14-6.
500 ms
000Bh