No. Name Setting Range Default
L1-19 Operation Time at Thermistor Disconnect (NTC) 0 to 3 3
Setting 0: Ramp to Stop
The drive stops the motor using the deceleration time set in parameter C1-02.
Setting 1: Coast to Stop
The drive output is switched off and the motor coasts to a stop.
Setting 2: Fast Stop
The drive stops the motor using the Fast stop time set in parameter C1-09.
Setting 3: Alarm Only
The operation is continued and a THo alarm is displayed on the digital operator.
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L1-20: Operation at Motor Overheat
Note: This parameter is only available in models 4A0930 and 4A1200.
Determines drive operation when a motor overheat fault (oH5) occurs.
No. Name Setting Range Default
L1-20 Operation at Motor Overheat 0 to 3 1
Setting 0: Ramp to Stop
The drive stops the motor using the deceleration time set in parameter C1-02.
Setting 1: Coast to Stop
The drive output is switched off and the motor coasts to a stop.
Setting 2: Fast Stop
The drive stops the motor using the Fast stop time set in parameter C1-09.
Setting 3: Alarm Only
The operation is continued and an oH5 alarm is displayed on the digital operator.
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L2: Momentary Power Loss Ride-Thru
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L2-01: Momentary Power Loss Operation Selection
When a momentary power loss occurs (DC bus voltage falls below the level set in L2-05), the drive can automatically return
to the operation it was performing prior to the power loss based on certain conditions.
No. Name Setting Range Default
L2-01 Momentary Power Loss Operation Selection 0 to 5 2
Setting 0: Disabled
If power is not restored within 15 ms, a Uv1 fault will result and the motor coasts to stop.
Setting 1: Recover within L2-02
When a momentary power loss occurs, the drive output will be shut off. If the power returns within the time set to parameter
L2-02, the drive will perform Speed Search and attempt to resume operation. If power is not restored within this time (i.e.,
DC bus voltage level remains below Uv1 detection level L2-05), then a Uv1 fault is triggered and the drive will stop.
Setting 2: Recover as long as CPU Has Power
When a momentary power loss occurs, the drive output will be shut off. If the power returns and the drive control circuit has
power, the drive will attempt to perform Speed Search and resume the operation. This will not trigger a Uv1 fault.
Setting 3: Kinetic Energy Backup (KEB) Ride-Thru Operation within L2-02
The drive decelerates using regenerative energy from the motor until the time set in L2-02 has expired. It then tries to accelerate
back to the frequency reference. If the power does not return within the time set to L2-02, it will trigger a Uv1 fault and the
drive output will shut off. The type of KEB operation is determined by the L2-29 setting.
5.8 L: Protection Functions
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YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
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