L2: Momentary Power Loss Ride-Thru - YASKAWA CIMR-ZU A Series Programming Manual

Settin 2 eco er as lon as CPU as Po er
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.
Notes on Settin s 1 and 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.
• When using a magnetic contactor between the motor and the drive, keep the magnetic contactor closed as long as the drive
attempts to restart with Speed Search.
L2 2 Momentary Po er Loss ide
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 the frequency reference. This parameter is valid if L2-01 = 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
Note:
the upper limit for L2-02.
No
L2-02
L2 Momentary Po er Loss Minimum Basebloc
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 or overvoltage occurs at the
beginning of Speed Search, after a power loss, or during DC Injection Braking.
No
L2-03 Momentary Power Loss Minimum Baseblock Time
L2 Momentary Po er Loss olta e eco ery amp ime
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 Momentary Power Loss Voltage Recovery Ramp Time
L2 Under olta e Detection Le el (U )
Determines the voltage at which a Uv1 fault is triggered or at which the KEB function is activated. This setting rarely needs
to be changed.
No
L2-05
<1> Values are specific to 200 V class drives. Double the value for 400 V class drives.
<2> The default setting for 400 V class drives depends on whether the drive input voltage is over 400 V or under 400 V.
1. Install an AC reactor option on the input side of the power supply when setting L2-05 below the default value to prevent damage to
Note:
drive circuitry.
2. If using KEB Ride-Thru and L2-05 is set too low, then undervoltage in the DC bus (Uv1) will be triggered before KEB Ride-Thru can
be executed. Take caution not to set this value too low.
L2 EB Deceleration ime
Sets the time to decelerate from the frequency reference at the time KEB Ride-Thru was initiated to zero speed.
No
L2-06
L2 7 EB Acceleration ime
Sets the time to reaccelerate from the speed when KEB was deactivated to the frequency reference.
When set to 0.0 s, the drive will accelerate to speed according to the active deceleration time set by C1-01 or C1-03.
Name
Momentary Power Loss Ride-Thru Time
Name
Name
Name
Undervoltage Detection Level
Name
KEB Deceleration Time
ru ime
ime
1 8 L Protection Functions
Settin an e
0.0 to 25.5 s Determined by o2-04
Settin an e
0.1 to 5.0 s Determined by o2-04
Settin an e
0.0 to 5.0 s Determined by o2-04
Settin an e
A1-02, E1-01, and
150 to 220 Vdc
<1>
Settin an e
0.00 to 6000.0 s
De ault
De ault
De ault
De ault
Determined by
o2-04
<2>
1
De ault
0.00 s
1