L9: Drive Protection 2 - YASKAWA U1000 Series Technical Manual

5.8 L: Protection Functions
The drive uses the delay time set in parameter L8-40 and a hysteresis of 12% when switching the carrier frequency back
to the set value.
L8-40: Carrier Frequency Reduction Off-Delay Time

The following settings are used when the carrier frequency is to be reduced at start:
• Time taken for the reduced carrier frequency to return to the carrier frequency set at C6-02.
• Time taken to return to the set carrier frequency after reducing it by setting L8-38 to 1 or 2.
The carrier frequency reduction function at start is disabled if this value is 0.00 s.
No.
L8-40
L8-41: High Current Alarm Selection

Triggers a current alarm (HCA) when the output current rises too much.
No.
L8-41
Setting 0: Disabled
No alarm is detected.
Setting 1: Enabled
An alarm is triggered when the output current exceeds 150% of the drive rated current. A digital output set for an minor
fault (H2- = 10) will close.
L8-93: LSo Detection Time at Low Speed

Sets the amount of time until baseblock is executed once LSo has been detected at low speed. A setting of 0.0 s
essentially disables this parameters.
No.
L8-93
L8-94: LSo Detection Level at Low Speed

Determines the detection level of LSo at low speed. Set as a percentage of the maximum frequency (E1-04).
No.
L8-94
L8-95: Average LSo Frequency at Low Speed

Sets the average number of times LSo can occur at low speed.
No.
L8-95
 L9: Drive Protection 2
L9-03: Carrier Frequency Reduction Level Selection

There is normally no need to change this parameter from the default value.
Selects which current level is used for the automatic carrier frequency reduction function.
No.
L9-03
Setting 0: Rated Current Reduces the carrier frequency based on the drive rated current.
Setting 1: Derated Current Reduces the carrier frequency based on the drive current after derating due to
temperature or carrier frequency setting (C6-02).
280
Name
Carrier Frequency Reduction Off-Delay Time
Name
High Current Alarm Selection
Name
LSo Detection Time at Low Speed
Name
LSo Detection Level at Low Speed
Name
Average LSo Frequency at Low Speed
Name
Carrier Frequency Reduction Level Selection
Setting Range
0.00 to 2.00 s
Setting Range
Setting Range
Setting Range
Setting Range
Setting Range
YASKAWA ELECTRIC SIEP C710636 03A YASKAWA U1000 Technical Manual
Default
Determined by A1-02
Default
0 or 1
Default
0.0 to 10.0 s
Default
0 to 10%
Default
1 to 50 times 10 times
Default
0, 1
0
1.0 s
3%
0