YASKAWA
SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
321
The drive momentarily turns OFF its output after a power loss. If the power returns in the time set to
L2-02
, the drive
will do Speed Search and try to continue operation.
If the DC bus voltage is less than or equal to the
Uv1
detection level for the time set in
L2-02
, the drive will detect
Uv1
and output a fault signal.
Note:
•
The necessary time for the drive to restart after power returns is different for different drive capacities.
•
The upper limit of the possible momentary power loss Ride-Thru time is different for different drive models.
2 : Enabled while CPU Power Active
When power returns and the drive control circuit has power, the drive will restart. This will not trigger
Uv1
.
When there is a momentary power loss, the drive output will turn OFF. If the power returns and the drive control
circuit has power, the drive will do Speed Search and try to continue operation. This will not trigger a
Uv1
. This
function enables longer support for power loss than when
L2-01 = 1
.
Note:
When you set
L2-01
, make sure that you know these items:
•
You can use a Momentary Power Loss Unit on models D007 to D059 and B001 to B021 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
L2-01 = 1 or 2
,
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.
■
L2-02: Power Loss Ride Through Time
No.
(Hex.)
Name
Description
Default
(Range)
L2-02
(0486)
Power Loss Ride Through
Time
Sets the maximum time that the drive will wait until it tries to restart after power loss.
Determined by o2-04
(0.0 - 25.5 s)
This function is applicable when
L2-01 = 1 [Power Loss Ride Through Select = Enabled for L2-02 Time]
. 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.
■
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
(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 the correct voltage after it completes speed
searches.
Determined by o2-04
(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]
.
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Страница 454: ...5 14 Z Bypass Parameters 454 YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference...
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Страница 694: ...9 19 Defaults by Bypass and Drive Model 694 YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference...
Страница 768: ...10 6 MEMOBUS Modbus Communications 768 YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference...
Страница 780: ...11 3 European Standards 780 YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference...