YASKAWA U1000 Series Technical Manual page 302

5.8 L: Protection Functions
Setting 0: Disabled (default)
If a momentary power loss occurs, a power supply frequency fault (Fdv) is detected and the drive output is turned OFF.
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 an Fdv 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. An Fdv fault is not
triggered even if the control power is below the Fdv level.
Note: 1. When using a magnetic contactor between the motor and the drive, keep the magnetic contactor closed during the momentary power
loss.
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.
■ L2-02: Momentary Power Loss Ride-Thru Time
Sets the maximum time allowed to ride through a power loss. If power loss operation exceeds this time, the drive will
attempt to accelerate back to frequency reference. This parameter is valid if L2-01 = 1.
Note: 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.
No.
L2-02
■ L2-03: Momentary Power Loss Minimum Baseblock Time
Sets the minimum baseblock time when power is restored following a momentary power loss. This determines the time
the drive waits for the residual voltage in the motor to dissipate. Increase this setting if overcurrent occurs at the
beginning of Speed Search, after a power loss, or during DC Injection Braking.
No.
L2-03
L2-04: Momentary Power Loss Voltage Recovery Ramp Time
■
Sets the time for the drive to restore the output voltage to the level specified by the V/f pattern after Speed Search. The
setting value determines the time for the voltage to go from 0 V to the maximum voltage.
No.
L2-04
L2-07: Momentary Power Loss Voltage Recovery Acceleration Time
■
Sets the time to reaccelerate from the deceleration frequency to the frequency set in frequency reference (frequency
before power loss) after momentary power loss.
When set to 0.0 s, the drive will accelerate back up to speed according to the active acceleration time set by C1-01,
C1-03, C1-05, or C1-07.
No.
L2-07
<1> Setting range is determined by the accel/decel time units set in C1-10. If the time is set in units of 0.01 s (C1-10 = 0), the setting range becomes
0.00 to 600.00 s.
302
Name
Momentary Power Loss Ride-Thru Time
Name
Momentary Power Loss Minimum Baseblock Time
Name
Momentary Power Loss Voltage Recovery Ramp Time
Name
Momentary Power Loss Voltage Recovery Acceleration Time
Setting Range
0.0 to 2.5 s
Setting Range
0.1 to 5.0 s
Setting Range
0.0 to 5.0 s
Setting Range
0.00 to 6000.0 s
YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual
Default
0.5 s
Default
Determined by C6-01
and o2-04
Default
Determined by C6-01 and
o2-04
Default
0.00 s
<1>