5.8 L: Protection Functions
234 YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
n L8-46: AVR Function Selection
Enables or disabled the AVR function. If enabled AVR adjusts the PWM to have the output voltage at the desired level
even if the DC bus voltage changes.
Setting 0: Disabled
Setting 1: Enabled
n L8-55: Internal Braking Transistor Protection
Enables or disables protection for the internal braking transistor.
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 DC5.
• 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 transistor fault (rF).
Setting 1: Enabled
The following models come with a built-in braking transistor:
•CIMR-T2A0004 to 2A0138
•CIMR-T4A0002 to 4A0072
Enable L8-55 when connecting a braking resistor or a braking resistor unit to the drive built-in braking transistor.
n
L8-93: Pull-Out Detection Time at Low Speed
Sets the amount of time until baseblock is executed once pull-out has been detected at low speed. A setting of 0.0 s
essentially disables this parameters.
n
L8-94: Pull-Out Detection Level at Low Speed
Determines the detection level of pull-out at low speed. The value is set as a percentage of the maximum frequency.
n
L8-95: Average Pull-Out Frequency at Low Speed
Sets the average number of times pull-out can occur at low speed.
No. Name Setting Range Default
L8-46 AVR Function Selection 0, 1 1
No. Name Setting Range Default
L8-55 Internal Braking Transistor Protection 0 or 1 1
No. Name Setting Range Default
L8-93 Pull-Out Detection Time at Low Speed 0.0 to 10.0 s 1.0 s
No. Name Setting Range Default
L8-94 Pull-Out Detection Level at Low Speed 0 to 10% 3%
No. Name Setting Range Default
L8-95 Average Pull-Out Frequency at Low Speed 1 to 50 Times 10 Times
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