YASKAWA CIMR-VU BA0001 Technical Manual page 235

n 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).
No.
L8-01
Setting 0: Disabled
Disables the braking resistor protection. Use this setting for any braking option other than the Yaskawa ERF Type resistor.
Setting 1: Enabled
Enables the protection for ERF type resistors.
n L8-02: Overheat Alarm Level
Sets the overheat alarm (oH) detection level.
The drive will output an alarm when the heatsink temperature exceeds 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 (H2-01/02/03 = 20), the switch will close when the heatsink temperature
rises above L8-02.
No.
L8-02
n L8-03: Overheat Pre-Alarm Operation Selection
Sets the operation when an overheat pre-alarm is detected.
No.
L8-03
Setting 0: Ramp to Stop
If an overheat alarm occurs, the drive decelerates to stop using the selected deceleration time. If a digital output is programmed
for "fault" (H2-01/02/03 = E), this output will be triggered.
Setting 1: Coast to Stop
If an overheat alarm occurs, the drive switches off the output and the motor coasts to stop. If a digital output is programmed
for "fault" (H2-01/02/03 = E), this output will be triggered.
Setting 2: Fast-stop
If an overheat alarm occurs, the drive decelerates to stop using the Fast-stop time (C1-09). If a digital output is programmed
for "fault" (H2-01/02/03 = E), this output will be triggered.
Setting 3: Alarm Only
If an overheat alarm occurs, an alarm is output and the drive continues operation.
Setting 4: Operation with Reduced Speed
If an overheat alarm occurs, the operation is continued but the speed is reduced to the level set in parameter L8-19. If after 10
s the oH alarm is still present, the speed is reduced once more. The amount of reduction depends on how often the alarm
repeats. If the oH alarm disappears while the drive is operating at a reduced speed, then the drive will switch back to the
previous speed it was reduced to before.
output programmed for 4D is switched when the oH alarm is still active after ten reduction cycles.
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual
Name
Internal Braking Resistor Protection
Name
Overheat Alarm Level
Name
Overheat Pre-Alarm Operation
Figure 5.90 explains the operation with reduced speed during an oH alarm. A digital
5.8 L: Protection Functions
Setting Range
0 or 1
Setting Range
50 to 130 °C Depending on size
Setting Range
0 to 4
Default
0
Default
Default
3
5
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