12.9 L: Protection Functions
704 YASKAWA SIEPC71061753C GA500 Technical Manual
This function is applicable when L2-01 = 1, 3 [Power Loss Ride Through Select = Enabled, Kinetic Energy
Backup: L2-02].
After a power loss, if these conditions are satisfied, the drive detects Uv1 [DC Bus Undervoltage], shuts off the
output, and the motor coasts to stop:
• After the DC bus voltage decreases less than the level of L2-05 [Undervoltage Detection Lvl (Uv1)], the time
set in L2-02 is expired.
• The drive does not detect a Uv2 [Control Power Undervoltage].
Depending on use conditions, if the time set in L2-02 is long, the drive may detect Uv2 before Uv1. If this is a
problem, decrease the time set in L2-02 to prevent Uv2.
Note:
• The length of time that the drive can recover after a power loss changes when drive capacity changes.
• The upper limit of the possible momentary power loss Ride-Thru time changes when drive capacity changes.
■ L2-03: Minimum Baseblock Time
No.
(Hex.)
Name Description
Default
(Range)
L2-03
(0487)
Minimum Baseblock Time
Sets the minimum time to continue the drive output block (baseblock) after a baseblock.
Determined by o2-04, C6-
01
(0.1 - 5.0 s)
Sets the length of time that the drive will wait for the residual voltage in the motor to dissipate in estimation to the
secondary circuit time constant of the motor. If oC [Overcurrent] or ov [DC Bus Overvoltage] occur at the start of
Speed Search, after power returns, or during DC Injection Braking, increase this setting.
■ L2-04: Powerloss V/f Recovery Ramp Time
No.
(Hex.)
Name Description
Default
(Range)
L2-04
(0488)
Powerloss V/f Recovery
Ramp Time
Sets the time for the drive output voltage to go back to correct voltage after completing speed
searches.
Determined by o2-04, C6-
01
(0.0 - 5.0 s)
Sets the time for voltage to recover from 0 V to the value set in E1-05 [Maximum Output Voltage].
■ L2-05: Undervoltage Detection Lvl (Uv1)
No.
(Hex.)
Name Description
Default
(Range)
L2-05
(0489)
Undervoltage Detection Lvl
(Uv1)
Sets the voltage at which a Uv1 [DC Bus Undervoltage] fault is triggered or at which the KEB
function is activated. Usually it is not necessary to change this setting.
Determined by o2-04 and
E1-01
(200 V Class: 150 - 210 V,
400 V Class: 300 - 420 V)
NOTICE: Damage to Equipment. When you set this parameter to a value lower than the default, you must install an AC reactor
on the input side of the power supply. If you do not install an AC reactor, it will cause damage to the drive circuitry.
Note:
If the low voltage detection level is near the lower limit value of L2-05, the drive will detect Uv1 during KEB Ride-Thru operation. Do
not set the value too low when you use the KEB Ride-Thru function.
■ L2-06: Kinetic Energy Backup Decel Time
No.
(Hex.)
Name Description
Default
(Range)
L2-06
(048A)
Expert
Kinetic Energy Backup
Decel Time
Sets the deceleration time during KEB operation used to decrease the maximum output frequency
to 0.
0.0 s
(0.0 - 6000.0 s)
Set L2-29 = 2 or 3 [Kinetic Energy Backup Method = System KEB Ride-Thru 1 or System KEB Ride-Thru 2] to
enable this function. When L2-29 = 1, 2 , 3 [Kinetic Energy Backup Method = Single Drive KEB Ride-Thru 2,
System KEB Ride-Thru 1, System KEB Ride-Thru 2] and you do KEB Auto-Tuning, the drive will automatically
set this value.
Sets the deceleration time necessary to decelerate from the frequency reference to 0 Hz when the drive detects a
momentary power loss. If a Uv1 [DC Bus Undervoltage] fault occurs during KEB operation, decrease the
deceleration time. If an ov [Overvoltage] fault occurs, increase the deceleration time.
• L2-06 = 0
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