YASKAWA GA700 Series Technical Manual page 883

Note:
When you set L2-01, make sure that you know these items:
• You can use a Momentary Power Loss Unit on models 2004 to 2056 and 4002 to 4031 for a longer momentary power loss ride through
time. A Momentary Power Loss Unit makes it possible to continue operation of the drive after a maximum of 2 seconds of power loss.
• When you set L2-01 = 1 to 4, keep the magnetic contactor on the drive input side ON and keep the control signal while the drive does
KEB operation.
• When L2-01 = 1 to 5, Uv [DC Bus Undervoltage] will flash on the keypad while the drive is attempting to recover from a momentary
power loss. The drive will not output a fault signal at this time.
• When you use a magnetic contactor between the motor and the drive, keep the magnetic contactor closed while the drive does KEB
operation or tries to restart with Speed Search.
• Keep the Run command active during KEB operation. The drive cannot accelerate back to the frequency reference when the power
returns.
• When L2-01 = 3 to 5, if the control power supply voltage is less than the CPU operation level during KEB Ride-Thru, it will trigger
Uv1.
• When the CPU is inactive, b1-17 [Run Command at Power Up] sets operation at power up.
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L2-02: Power Loss Ride Through Time
No.
Name
(Hex.)
L2-02 Power Loss Ride Through
Time
(0486)
This function is applicable when L2-01 = 1, 3 [Power Loss Ride Through Select = Enabled for L2-02 Time,
Kinetic Energy Backup: L2-02]. If power loss operation is longer than the time set in this parameter, the drive will
detect Uv1 [DC Bus Undervoltage], turn OFF output, and the motor will coast to stop.
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.
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L2-03: Minimum Baseblock Time
No.
Name
(Hex.)
L2-03 Minimum Baseblock Time
(0487)
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.
Name
(Hex.)
L2-04 Powerloss V/f Recovery
Ramp Time
(0488)
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.
Name
(Hex.)
L2-05 Undervoltage Detection Lvl
(Uv1)
(0489)
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.
YASKAWA SIEPC71061705H GA700 Series Technical Manual
V/f CL-V/f OLV CLV AOLV
Sets the maximum time that the drive will wait until trying to restart after power loss.
V/f CL-V/f OLV CLV AOLV
Sets the minimum time to continue the drive output block (baseblock) after a baseblock.
V/f CL-V/f OLV CLV AOLV
Sets the time for the drive output voltage to go back to correct voltage after completing speed
searches.
V/f CL-V/f OLV CLV AOLV
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.
12.9 L: Protection Functions
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Default
(Range)
Determined by o2-04, C6-
01
(0.0 - 25.5 s)
Default
(Range)
Determined by o2-04, C6-
01
(0.1 - 5.0 s)
Default
(Range)
Determined by o2-04, C6-
01
(0.0 - 5.0 s)
Default
(Range)
Determined by o2-04 and
E1-01
(200 V Class: 150 - 210 V,
400 V Class: 300 - 420 V)
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