YASKAWA T1000A - Page 230

5.8 L: Protection Functions
230 YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
Setting 0: Ramp to stop
If an overheat alarm occurs, the drive decelerates to stop using the deceleration time currently selected. If a digital output
is programmed for “fault” (H2- = E), this output will be triggered.
Setting 1: Coast to stop
If heatsink overheat (oH) occurs, the drive switches off the output and the motor coasts to stop. If a digital output is
programmed for “fault” (H2- = 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- = E), this output will be triggered.
Setting 3: Alarm only
If an overheat alarm occurs, an alarm is output and the drive continues operation.
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L8-05: Input Phase Loss Protection Selection
Enables or disables the input phase loss detection.
Setting 0: Disabled
Setting 1: Enabled (software detection only)
Setting 4: Enabled (both software and hardware detection)
Enables input phase loss detection. As detection is performed by measuring the DC bus ripple, a phase loss fault (PF) can
also be triggered by a power supply voltage imbalance or main circuit capacitor deterioration. Detection is disabled if:
• The drive is decelerating.
• No Run command is active.
• Output current is less than or equal to 30% of the drive rated current.
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L8-07: Output Phase Loss Protection Selection
Enables or disables the output phase loss detection, which is triggered when the output current falls below 5% of the
drive rated current.
Note: 1. Output phase loss detection can mistakenly be triggered if the motor rated current is very small compared to the drive rating. Disable
this parameter in such cases.
2. Output phase loss detection is not possible when the drive is running a PM motor with light load.
Setting 0: Disabled
Setting 1: Fault when one phase is lost
An output phase loss fault (LF) is triggered when one output phase is lost. The output shuts off and the motor coasts to
stop.
Setting 2: Fault when two phases are lost
An output phase loss fault (LF) is triggered when two output phases are lost. The output shuts off and the motor coasts to
stop.
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L8-09: Output Ground Fault Detection Selection
Enables or disables the output ground fault detection.
No. Name Setting Range Default
L8-03 Overheat Pre-Alarm Operation Selection 0 to 3 3
No. Name Setting Range Default
L8-05 Input Phase Loss Protection Selection 0, 1, 4 1
No. Name Setting Range Default
L8-07 Output Phase Loss Protection Selection 0 to 2 0
No. Name Setting Range Default
L8-09 Output Ground Fault Detection Selection 0 or 1 1