5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 301
Setting 0: Disabled
Braking transistor protection should be disabled whenever the internal braking transistor is not used. This includes,
• when using a regen converter such as DC.
• when using a regen unit such as RC5.
• when using external braking transistor options like CDBR units.
• when the drive is used in common DC bus applications
and the internal braking chopper is not installed.
Enabling this L8-55 under such conditions can incorrectly trigger a braking resistor fault (rF).
Setting 1: Enabled
The following models come with a built-in braking transistor:
•CIMR-A2A0004 to 2A0138
•CIMR-A4A0002 to 4A0072
Enable L8-55 when connect
ing a braking resistor or a braking resistor unit to the drive built-in braking transistor.
L8-78: Power Unit Output Phase Loss Protection
Protects the power unit from phase loss.
Note: This parameter is available in models CIMR-A4A0930 and 4A1200.
Setting 0: Disabled
Setting 1: Enabled
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.
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).
L8-95: Average LSo Frequency at Low Speed
Sets the average number of times LSo can occur at low speed.
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 start or clear current level for automatic carrier
frequency reduction.
Note: This parameter is not available in models CIMR-A4A0930 and 4A1200.
Setting 0: Reduces the carrier frequency based on the drive rated current that is not derated.
Setting 1: Reduces the carrier frequency based on the drive rated current that is derated by the carrier
f
requency and temperature with C6-02 selection.
No. Name Setting Range Default
L8-78 Power Unit Output Phase Loss Protection 0, 1 1
No. Name Setting Range Default
L8-93 LSo Detection Time at Low Speed 0.0 to 10.0 s 1.0 s
No. Name Setting Range Default
L8-94 LSo Detection Level at Low Speed 0 to 10% 3%
No. Name Setting Range Default
L8-95 Average LSo Frequency at Low Speed 1 to 50 times 10 times
No. Name Setting Range Default
L9-03 Carrier Frequency Reduction Level Selection 0, 1 0
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