１２９
8.2.14 Over voltage suppression
The Overvoltage Suppression (OVS) feature will over speed the motor up to the
'25.02' (Maximum OVS
Output Frequency)
to prevent motor regeneration and creating an Overvoltage Fault. If the OVS runs at
maximum frequency for longer than the
'25.08' (Limit Time)
, the unit will fault on ovFS.
OVS Functional Description
By calculating torque in real time, reduce regeneration energy by increasing speed.
For speed control, PI controller is applied.
If torque is bigger than 0, "PI Out" become 0 by "PI Limiter"; no increase in frequency value
If torque is lower than 0, "PI Out" would be increased to
'25.02' (Max Add Freq) + Ref Frequency
; frequency value increased
If output of PI controller is reached to
'25.02' (Max Add Freq) + Ref Frequency
:
the counter is started.
When the value of counter is reached to
'25.08' (wRegen Time),
the trip (ovFS) will be occur.
PID P Gain
PID I Gain
PID D Gain
PI Limit = 25.02
0
LIMIT
Frequency Add
VFD Freq_Out
LIMIT
0
LIMIT
0
Final Frequency Out
25.03
25.04
25.05
30.01
30.01
Sample parameters
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