YASKAWA HV600 Manual page 359

Output frequency reduction = Motor rated slip before KEB operation × (L2-08/100) × 2
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L2-09: KEB Minimum Frequency Level
No.
Name
(Hex.)
L2-09 KEB Minimum Frequency
Level
(048D)
Expert
These conditions set the quantity of decrease:
• Motor rated slip × (L2-09/100)
• The larger value between the value calculated with L2-08 and the value calculated with L2-09
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L2-10: Minimum KEB Time
No.
Name
(Hex.)
L2-10 Minimum KEB Time
(048E)
Expert
When you return power while KEB is operating, the drive continues KEB operation until the time set in L2-10 is
expired. When you input KEB Ride-Thru 1/2 [H1-xx = 65, 66, 7A, or 7B] into the drive and the DC bus voltage is less
than L2-05 [Undervoltage Detect Level (Uv1)], KEB operation continues until the time set in L2-10 is expired.
When you input KEB Ride-Thru, KEB operation continues after the time set in L2-10 is expired. When you cancel
KEB Ride-Thru, the motor accelerates again. When you do not input KEB Ride-Thru during the time set in L2-10, the
drive accelerates to the frequency reference that the drive had before power loss in the applicable acceleration time.
Note:
• When L2-01 = 0, 1, or 2 [Disabled, Enabled, or Enabled when CPU is Running], increase the value of L2-10. Set L2-10 to cancel KEB
operation if the KEB Ride-Thru is not input
• Set this parameter to 0 to disable the function.
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L2-11: KEB DC Bus Voltage Setpoint
No.
Name
(Hex.)
L2-11 KEB DC Bus Voltage
Setpoint
(0461)
Expert
■
L2-29: Kinetic Energy Backup Method
No.
Name
(Hex.)
L2-29 Kinetic Energy Backup
Method
(0475)
Expert
0 : Single Drive KEB Ride-Thru 1
The drive monitors the DC bus voltage and uses regenerative energy from the motor to hold the DC bus voltage at the
level set in L2-11 [KEB DC Bus Voltage Setpoint].
The KEB operation continues and the deceleration rate changes as specified by C1-09 [Fast Stop Time].
Note:
• If the drive detects Uv1 [DC Bus Undervoltage] during KEB operation, decrease the value of C1-09.
• If the drive detects ov [Overvoltage] during KEB operation, increase the value of C1-09.
1 : Single Drive KEB Ride-Thru 2
The drive does KEB operation and automatically calculates the deceleration rate to make sure that the main circuit
electrical energy and main current voltage from motor regenerative energy is equal to L2-11.
YASKAWA TOEPYAIHV6002A HV600 Drive Programming
V/f OLV/PM EZOLV OLV/PM
Sets the quantity of output frequency reduction used as a percentage of E2-02 [Motor Rated Slip]
when KEB operation starts.
V/f OLV/PM EZOLV OLV/PM
Sets the minimum length of time to operate the KEB after the drive detects a momentary power loss.
V/f OLV/PM EZOLV OLV/PM
Sets the target value that controls the DC bus voltage to a constant level in Single Drive KEB Ride-
Thru 2. Sets the DC bus voltage level that completes the KEB operation for all other KEB methods.
V/f OLV/PM OLV/PM EZOLV
Sets the KEB function operation mode.
Description
Description
Description
Description
2.9 L: Protection Functions
Default
(Range)
20%
(0 - 100%)
Default
(Range)
50 ms
(0 - 25500 ms)
Default
(Range)
Determined by E1-01
(Determined by E1-01)
Default
(Range)
0
(0 - 1)
2
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