6. Description of Parameters
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6.6.8 Overspeed Protection
Function Code Parameter Name Setting Range Default
F9-67
Overspeed detection level 0.0% to 50.0% (max. frequency) 20.0%
F9-68
Overspeed detection time 0.0s to 60.0s 1.0s
These function parameters define motor overspeed detection that is effective only for vector
control with speed sensor.
When detected motor speed exceeds maximum frequency and the excess is larger than the
value of F9-67 for longer than time set in F9-68, the AC drive detects Err43 and acts as selected
in the tens
position
in F9-50.
If F9-68 is set to 0, motor overspeed detection is disabled.
6.6.9 Speed Error Protection
Function Code Parameter Name Setting Range Default
F9-69
Detection level of speed
error
0.0% to 50.0% (max. frequency) 20.0%
F9-70
Detection time of speed
error
0.0s to 60.0s 5.0s
This function is effective only for vector control with speed sensor.
When detected motor speed is different from frequency reference and the difference is larger
than the value of F9-69 for longer than the time set in F9-70, the AC drive detects Err42 and acts
as selected in the units
position
in F9-50.
6.6.10 Undervoltage & Overvoltage Threshold and Overcurrent Fast Prevention
Function Code Parameter Name Setting Range Default
A5-06
Undervoltage threshold 210 to 420 V 350 V
A5-09
Overvoltage threshold 650 to 820 V 820 V
A5-04
Overcurrent fast prevention 0: Disabled
1: Enabled
1
When DC bus voltage exceeds the setting of A5-06/A5-09, the AC drive detects Err09/Err05–
Err07.
It is suggested that overcurrent fast prevention is disabled (A5-04 = 0) in hoist applications such
as crane.
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