YASKAWA V1000 Series Technical Manual page 190

5.8 L: Protection Functions
• This setting rarely needs to be changed.
• Determines the voltage level in the DC bus that is considered to be UV. Uses externals terminal +1 and -.
• When setting L2-05 lower than the default setting, be sure to install an AC reactor option to the input side of the power supply to prevent damage to
drive circuitry.
KEB Function
n
KEB (Kinetic Energy Back-Up) decelerates the motor using regenerative energy when power loss has been detected. By keeping the DC bus voltage at
a constant level, KEB Ride-Thru allows the drive to continue running without interrupting the output power during momentary power loss. Once power
is restored, the drive smoothly returns to the same operational state before the power loss occurred.
Operation Selection and Setting Method
To set KEB Ride-Thru the input terminals, enter 65 or 66 (N.C. and N.O. respectively) to one of the H1 parameters. To set KEB Ride-Thru 2, enter 7A
or 7B (again, N.C. and N.O. respectively) to one of the H1 parameters. As shown in
be set between the power supply and the terminal set to KEB Ride-Thru. The drive can be set to trigger KEB when the magnetic contactor opens or closes.
Depending on the specifications, set the input auxiliary switch to be N.O. or N.C.
Note: To properly use the KEB function, make sure that the drive is set so that the run command does not switch off when momentary power loss occurs. If the run command is
switched off, the drive will not accelerate back to speed when the power is restored.
KEB Ride-Thru 1
When KEB Ride-Thru 1 has been set to one of the multi-function input terminals, the drive will decelerate at the time set to L2-06. If KEB Ride-Thru is
switched off after about 50 ms, the drive will then begin to accelerate again for the time set to L2-07. Use this function to enable KEB Ride-Thru with
multiple motors running from the same drive.
Note: Although KEB operation will still begin even if the voltage level in the DC bus is below the value specified in L2-05 prior to KEB Ride-Thru 1, the drive will accelerate back
up to speed if the KEB is switched off after approximately 50 ms. Make sure the KEB Ride-Thru 1 is operating properly. This function requires a breaking resistor.
KEB Ride-Thru 2
When KEB Ride-Thru 2 is entered through one of the multi-function input terminals, the drive will decelerate while maintaining the DC bus voltage at
the level specified in L3-16. If KEB Ride-Thru 2 is switched off after about 50 ms, then once power is restored the drive will accelerate back up to the
speed it was at prior to the power loss. Use this function to have the drive decelerate by KEB only.
Note: Although KEB operation will still begin even if the voltage level in the DC bus is below the value specified in L2-05 prior to KEB Ride-Thru 2, the drive will accelerate back
up to speed if the KEB is switched off after approximately 50 ms. Make sure the KEB Ride-Thru 2 is operating properly.
L2-06: KEB Deceleration Time
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No.
L2-06
Sets the time to decelerate from the maximum frequency down to zero speed after KEB Ride-Thru 1 has been entered to one of the multi-function input.
L2-07: Momentary Power Loss Ride-Thru Time
n
No.
L2-07
Sets the acceleration time to reaccelerate back up to the specified frequency following the momentary power loss occurs that triggered the KEB function.
When set to 0, the drive will accelerate back up to speed according to parameters C1-01 through C1-08.
L2-08: Minimum Frequency Gain at KEB Start
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No.
L2-08
The output frequency is reduced in steps when KEB Ride-Thru 1 begins. Set the rate of this decrease as a percentage using the following formula:
Amount of reduction = Slip frequency prior to KEB x (L
L2-11: Desired DC Bus Voltage during KEB
n
Sets the desired voltage in the DC bus when KEB is operating.
No.
L2-11
*1. Double this value when using a 400 V class unit.
*2. This value is initialized when E1-01 is changed.
190
MCCB
power
supply
aux switch
KEB command
forward run
command
Figure 5.72 KEB Function
Name
KEB Deceleration Time
Name
Momentary Power Loss Ride-Thru Time
Name
Minimum Frequency Gain at KEB Start
-08) x 2
2
Name
Desired DC Bus Voltage during KEB
Figure 5.71
, an auxiliary switch for the magnetic contactor should
DRIVE
R/L1 S/L2 T/L3
S5 H1-05 = 65
SI H1-01 = 40
SC
Setting Range
0.0 to 200.0
Setting Range
0.0 to 25.5
Setting Range
0 to 300
Setting Range
150 to 400 *1
YASKAWA ELECTRIC SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)
Default Page
0.0 s −
Default Page
0.0 s −
Default Page
100% −
Default Page
240% *3 −