5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 295
L7-07: Torque Limit Control Method Selection during Accel/Decel
Selects the function of torque limit during acceleration and deceleration.
Setting 0: Proportional control
The torque limit function works with P control during accel and decel, and switches to I control at constant speed. Use
this setting when accelerating or decelerating to the desired speed has priority over the torque limit during speed changes.
Setting 1: Integral control
The torque limit function always uses I control. Use this setting when a highly accurate torque limit is required, even
during speed changes. Using this function may increase the acceleration time, or may prevent the motor speed from
reaching the frequency reference if the torque limit is reached first.
L7-16: Torque Limit Process at Start
Assigns a time filter to allow the torque limit to build at start.
Setting 0: Disabled
Toque limit is created at start without a delay time. Disable L7-16 to maximize response time when the application
requires sudden acceleration or deceleration at start.
Setting 1: Enabled
A time filter is added to allow the torque limit to build at start.
L8: Drive Protection
L8-01: Internal Dynamic Braking Resistor Protection Selection (ERF type)
This parameter selects the dynamic braking resistor protection when using an optional heatsink mounted braking resistor
(ERF type, 3% ED).
Note: This parameter is not available in models CIMR-A4A0930 and 4A1200.
Setting 0: Disabled
Disables braking resistor protection. Use this setting for any dynamic braking option other than the YASKAWA ERF
type resistor.
Setting 1: Enabled
Enables protection for YASKAWA ERF type resistors.
L8-02: Overheat Alarm Level
Sets the overheat alarm (oH) detection level.
The drive will output an alarm when the heatsink temperature excee
ds the alarm level set in parameter L8-02. If the
temperature reaches the overheat fault level, the drive will trigger an oH1 fault and stop operation.
When an output terminal is set for the oH pre-alarm (H2- = 20), the switch will close when the heatsink temperature
ris
es above L8-02.
No. Name Setting Range Default
L7-07 Torque Limit Control Method Selection during Accel/Decel 0 or 1 0
No. Name Setting Range Default
L7-16 Torque Limit Process at Start 0 to 1 1
No. Name Setting Range Default
L8-01 Internal Dynamic Braking Resistor Protection Selection (ERF type) 0 or 1 0
No. Name Setting Range Default
L8-02 Overheat Alarm Level 50 to 150 °C
Determined by C6-01 and
o2-04
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