Function Application
‑667‑
Para.
No.
Function Default
Value Range Description
F9‑51
Fault protection action 4
51111 ‑
‑
F9‑64 Load loss detection level 10.0% 0.0% to 100.0%
F9‑65 Load loss detection time 1.0s 0.1s to 60.0s
3.7.7 Overspeed Protection
The overspeed protection is valid only when the FVC mode is selected for the AC drive
(F0‑01 is set to 1).
When this protection is enabled, if detected motor speed exceeds the maximum
frequency (F0‑10) and the excess is greater than the value of F9‑67 (overspeed
threshold) for a period longer than the time set in F9‑68 (overspeed detection time),
the AC drive reports an alarm (E43.00) and acts according to F9‑50 (overspeed
protection action).
When F9‑68 (overspeed detection time) is set to 0.0s, the overspeed detection
function is disabled.
Related parameters
Para.
No.
Function Default
Value Range Description
F9‑67
Overspeed threshold
20.0%
0.0% to 50.0% (max.
frequency)
‑
F9‑68
Overspeed detection time
1.0s 0.0s to 60.0s
3.7.8 Excessive Speed Deviation Protection
The excessive speed deviation protection function is valid only when the FVC mode is
selected for the AC drive (F0‑01 is set to 1).
When this protection is enabled, if the AC drive detects that the deviation between
the actual motor running frequency and the frequency reference stays above the
excessive speed deviation threshold (F9‑69) for a period longer than the detection
time of excessive speed deviation (F9‑70), the AC drive generates an alarm of E42.00
(excessive speed deviation) and takes an action based on the setting of fault
protection action selection (F9‑50).
If F9‑70 (detection time of excessive speed deviation) is set to 0.0s, the excessive
speed deviation detection function is disabled.