5.8 L: Protection Functions
274 YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
Setting 1: Coast to stop
The drive output is switched off and the motor coasts to 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.
L1-20: Operation at Motor Overheat (oH5)
Determines drive operation when a motor overheat fault occurs (oH5).
Note: This parameter is available in models CIMR-A4A0930 and 4A1200.
Setting 0: Ramp to stop
The drive stops the motor using the deceleration time1 set in parameter C1-02.
Setting 1: Coast to stop
The drive output is switched off and the motor coasts to 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.
L2: Momentary Power Loss Ride-Thru
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 be set to
automatically return to the operation it was performing when the power went out based on certain conditions.
Setting 0: Disabled (default)
If power is not restored within 15 ms, a Uv1 fault will result and the drive will stop the motor. The motor coasts to stop.
Setting 1: Recover within L2-02
When a momentary power loss occurs, the drive output will be shut off. Should the power return within the time set to
parameter L2-02, th
e 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. Should the power return as long as the drive
control circuit has power, th
e drive will attempt to perform Speed Search and resume the operation. A Uv1 fault is not
triggered.
Setting 3: 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 returned within the time set in L2-02, an Uv1 fault is
triggered and the drive output shuts off. The type of KEB operation is determined by the setting of L2-29.
No. Name Setting Range Default
L1-20 Operation at Motor Overheat (oH5) 0 to 3 1
No. Name Setting Range Default
L2-01 Momentary Power Loss Operation Selection 0 to 5 0
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