Parameter Details
12
12.8 L: PROTECTION
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 743
Note:
• Display is in these units:
–Models4002 to 4023: 0.01 A
–Models 4031 to 4675: 0.1 A
• When the current level > 0.0 A, you cannot set this value < 10% of drive rated current.
■ L1-13 Motor oL1 Memory Selection
No.
(Hex.)
Name Description
Default
(Range)
L1-13
(046D)
Motor oL1 Memory
Selection
Sets the function that keeps the current electronic thermal protector value when the drive stops
receiving power.
1
(0, 1)
0 : Disabled
1 : Enabled
Sets if the drive will calculate the motor again when the drive is energized again.
◆ L2: POWER LOSS RIDE THROUGH
L2 parameters set the drive operation during momentary power loss and the KEB Ride-Thru function method of
operation.
■ KEB Ride-Thru Function
KEB is an acronym for Kinetic Energy Backup. If the drive detects a power loss or momentary power loss, it will
quickly decelerate the motor. The drive uses regenerative energy from the motor to keep the main circuit
operating. When you return power during motor deceleration, the drive returns operation to the status before the
power loss.
The KEB Ride-Thru function is different than other functions for continuous operation. If the drive detects
momentary power loss, the motor will ramp to stop. It will not coast to stop. This function is applicable for
applications in which it is necessary to prevent materials from running out, for example control for film and fiber
lines. The KEB Ride-Thru function has 4 methods of operation. Parameter L2-29 [KEB Method] sets the method.
When you use the KEB Ride-Thru function with one drive, set L2-29 = 1, 2 [Single KEB1 Ride-Thru, Single
KEB2 Ride-Thru].
If deceleration in coordination with more than one drive is necessary, for example textile machinery line systems,
set L2-29 = 3, 4 [System KEB1 Ride-Thru, System KEB2 Ride-Thru].
Table 12.51 KEB Ride-Thru Function Operation Method
L2-29 KEB Method Operation Configuration Precautions
1 Single KEB1 Ride-
Thru
The drive uses regenerative energy from the motor to keep the DC bus
voltage at the level set in L2-11 [KEB DC Volt Setpoint] while it
adjusts the rate of deceleration.
The KEB operation continues while the drive adjusts the deceleration
rate with the setting of C1-09 [Fast Stop Time].
• Set C1-09 correctly to prevent Uv1 [DC Bus Undervoltage] and ov
[Overvoltage].
• If the drive detects Uv1 during the KEB operation, decrease the
value set in C1-09.
• If the drive detects ov during the KEB operation, increase the value
set in C1-09.
2 Single KEB2 Ride-
Thru
The drive uses information about the inertia of the connected
machinery to find the deceleration rate necessary to keep the DC bus
voltage at the level set in parameter L2-11.
The drive uses system inertia to calculate the deceleration time. You
cannot adjust this value.
• If the drive detects Uv1 during the KEB operation, increase the
setting value of L3-20 [DCBus VoltAdj Gain] and L3-21 [OVSup
Acc/Dec Gain].
• If the drive detects ov during the KEB operation, decrease the
setting value of L3-20 and L3-21.
3 System KEB1 Ride-
Thru
The drive does not monitor the DC bus voltage. The drive decelerates
at the KEB deceleration time set in L2-06.
Use L2-06 to set the time necessary to decelerate from the current
frequency reference to 0 Hz. More than one drive can decelerate and
keep a constant speed ratio between drives.
Use the dynamic braking option with System KEB Ride-Thru 1.
4 System KEB2 Ride-
Thru
The drive uses the KEB deceleration time set in L2-06 to decelerate
and it also monitors the DC bus voltage.
If the voltage level increases, the drive momentarily holds the
frequency to prevent an ov before it continues to decelerate.
If you cannot use the dynamic braking option, use System KEB Ride-
Thru 2.
■ KEB Ride-Thru Start
When L2-01 = 1 [RideThru@PwrLoss = Enabled] and L2-50 = 2, 3, 4 [RidThruMode@PwrLoss = KEB Mode,
KEB Stop Mode, KEB Decel to Stop], the drive starts the KEB operation immediately after it detects a momentary
power loss. When one of these conditions occur, the drive will activate KEB Ride-Thru:
To Next Page
Loading...
Need help?
General
