YASKAWA OYMC V1000

1.8 L: Protection Functions
192 YASKAWA ELECTRIC SIEP C710606 10A YASKAWA AC Drive - V1000 PRELIM. Programming Manual
Setting 0: Disabled
Setting 1: Enabled
◆ L2: Momentary Power Loss Ridethru
■ 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.
Setting 1: Enabled, Recover Within L2-02
When a momentary power loss occurs, the drive will attempt to restart and perform Speed
Search if power is restored within the period of time set to parameter L2-02. If power is not
restored within the time set to L2-02 (i.e. DC bus voltage level remains below UV1
detection level L2-05), then a UV1 fault is triggered and the drive output will be shut off.
Setting 2: Recover as Long as CPU has Power
Drive will try to restart as long as the CPU still has power. This allows for a longer ride-
through time than setting L2-01 to 1. A UV1 fault is not triggered. This setting should also
be used if the KEB (Kinetic Energy Braking) function is utilized.
Note: 1. The amount of time the drive is capable of recovering after a power loss is determined by the capacity
of the drive. Drive capacity determines the upper limit for L2-02.
2. A Momentary Power Loss Unit is available to allow for a longer momentary power loss ride through
time in a 0.4 to 7.5 kW drive (200 or 400 V class). This option makes it possible to continue running
after up to two seconds of power loss.
3. When L2-01 is set to 1 or 2, and a magnetic contactor between motor and drive is used, be sure that the
magnetic contactor is kept close as long as the drive attempts to restart.
4. When L2-01 is set to 1 or 2, “UV” will flash on the operator while the drive is attempting to recover
from a momentary power loss. A fault signal is not output at this time.
No. Name Setting Range Default
L1-13
Continuous Electrothermal Overload Protection
Selection
0 or 1 1
No. Name Setting Range Default
L2-01 Momentary Power Loss Operation Selection 0 to 2 0