Group 6: Protection Function Parameters; Over-Voltage Stall Prevention; Over-Current Stall Prevention During Acceleration - Delta Electronics AC Drive VFD-F Series User Manual

VFD-F Series

5.7 Group 6: Protection Function Parameters

06 - 00

Over-voltage Stall Prevention

Settings
This parameter selects the voltage level for the Over-Voltage Stall Prevention function.
During decelerations, the DC bus voltage may exceed its maximum allowable value due to
motor regeneration. When this function is enabled, the AC drive will stop decelerating and
maintain a constant output frequency. The AC drive will only resume deceleration when the
voltage drops below the preset value.
With moderate inertial loads, the over-voltage stall prevention will not occur and the
deceleration time should be equal to Pr.1-10. With high inertial loads, the AC drive will
automatically extend the deceleration time due to the step function shown below. If the
deceleration time is critical for the application, then dynamic brake resistors should be
used.
06 - 01

Over-current Stall Prevention during Acceleration

Settings
This parameter selects the percentage of allowable over-current during acceleration before
the stall prevention is enabled.
During acceleration, the AC drive output current may increase abruptly and exceed the
value specified by Pr.06-01 due to rapid acceleration or excessive load on the motor. When
this function is enabled, the AC drive will stop accelerating and maintain a constant output
frequency. The AC drive will only resume acceleration when the current drops below the
value set in Pr.06-01 (please see the graph below).
When the over-current stall prevention is activated, the acceleration time of the AC drive will
be longer than the time set in Pr. 01-09.
230V series: 330.0 ~ 410.0VDC
460V series: 660.0 ~820.0VDC
00: Disable
Output frequency
Deceleration Time
20~150%
Deceleration characteristic
when Over-voltage stall
prevention enabled
Frequency held
5-30
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Factory Setting: 390.0/780.0
Time
Factory Setting: 120
Unit: 1