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Related Parameters
Parameter
Number
Momentary
Power Loss
Detection
Selection
L2-01
PwrL
Selection
Momentary
Power Loss
Ride-thru
L2-02
Time
PwrL
Ridethru t
Momentary
Power Loss
Minimum
Base Block
L2-03
Time
PwrL
Baseblock t
Momentary
Power Loss
Voltage
Recovery
L2-04
Ramp Time
PwrL V/F
Ramp t
Undervoltage
Detection
Level
L2-05
PUV Det
Level
1
*
In order for a restart to occur, the run command must be maintained throughout the ride thru period.
*2 Factory settings will vary based on drive capacity (values given here are for 200-240V class, 0.4kW).
*3 Setting value for 200-240V class. Double the value when working with 380-480V class drives
Setting Precautions
.
Error output signals are not output during momentary power loss recovery.
•
To continue Drive operation after power has been restored, make settings so that run commands from the
•
control main circuit terminal are stored even while power is suspended.
If the momentary power loss operation selection is set to 0 (Disabled), when the momentary power loss
•
exceeds 15ms during operation, alarm UV1 (main circuit undervoltage) will be detected.
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Name
Description
Display
Enables and disables the
momentary power loss function.
0: Disabled - Drive trips on (UV1)
fault when power is lost.
1: Power Loss Ride Thru
Time - Drive will restart if power
returns within the time set in
1
L2-02.*
2: CPU Power Active - Drive will
restart if power returns prior to
control power supply shut
1
down.*
Sets the power loss ride-thru time.
This value is dependent on the
capacity of the Drive. Only
effective when L2-01 = 1.
Sets the minimum time to wait to
allow the residual motor voltage to
decay before the Drive output turns
back on during power loss ride thru.
After a power loss, if L2-03 is
greater than L2-02, operation
resumes after the time set in L2-03.
Sets the time it takes the output
voltage to return to the preset V/f
pattern after speed search (current
detection mode) is complete.
Sets the Drive's DC Bus
undervoltage trip level. If this is set
lower than the factory setting,
additional AC input reactance or
DC bus reactance may be necessary.
Consult the factory before changing
this parameter setting.
Change
Setting
Factory
during
Range
Setting
V/f
Operation
0 to 2
0
No
A
0.1sec
0 to 25.5
No
A
*2
0.1
0.2sec
to
No
A
*2
5.0
0.0
0.3sec
to
No
A
*2
5.0
150
to
190Vdc
No
A
210
*3
*3
Control Methods
Open
Open
V/f
Loop
Flux
Loop
with
Vector
Vector
Vector
PG
1
2
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
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Troubleshooting
