2.8 L: Protection Functions
204 YASKAWA ELECTRIC TOEP C710687 03B FSDrive-MV1000 Parameter Guide
n KEB Operation Wiring Example
Figure 2.72 shows a wiring example for triggering the KEB Ride-Thru at power loss using an undervoltage relay. If
power loss occurs, the undervoltage relay triggers KEB Ride-Thru at contact input 9. Note that an additional dynamic
braking option is required if System KEB Ride-Thru 1 is used.
Note: Make sure the Run command is not switched off during momentary power loss ride-thru. If the Run command is shut off, the
drive will not accelerate back to speed when the power is restored.
Figure 2. 72
Figure 2.72 Example Wiring for KEB Ride-Thru Function
Note: When a momentary power loss ride-thru occurs, check if the Run command remains in effect. If the Run command is turned
OFF, the drive will not be able to accelerate to the speed set in the frequency reference when the power is restored.
n L2-02: Momentary Power Loss Ride-Thru Time
Sets the maximum time allowed to ride through a power loss ride-thru. If power loss ride-thru operation exceeds this
time, the drive will attempt to accelerate back to frequency reference. This parameter is valid if L2-01 = 1.
Note: The amount of time the drive is capable of recovering after a power loss is determined by the capacity of the drive. Drive
capacity determines the upper limit for L2-02.
n L2-03: Momentary Power Loss Ride-Thru Minimum Baseblock Time
Sets the minimum baseblock time when power is restored following a momentary power loss Ride-Thru. This determines
the time the drive waits for the residual voltage in the motor to dissipate. Increase this setting if overcurrent or
overvoltage occurs at the beginning of Speed Search, after a power loss ride-thru, or during DC Injection Braking.
n
L2-04: Momentary Power Loss Ride-Thru Voltage Recovery Ramp Time
Sets the time for the drive to restore the output voltage to the level specified by the V/f pattern after Speed Search. The
setting value determines the time for the voltage to go from 0 V to the maximum voltage.
No.
<1> For details on the default settings, refer to Defaults by Drive Model Selection (o2-04) on page 87.
Name Setting Range Default
L2-02 Momentary Power Loss Ride-Thru Time 0.0 to 25.5 s Determined by o2-04 <1>
No.
<1> For details on the default settings, refer to Defaults by Drive Model Selection (o2-04) on page 87.
Name Setting Range Default
L2-03
Momentary Power Loss Ride-Thru Minimum Baseblock
Time
0.1 to 20.0 s Determined by o2-04 <1>
No.
<1> For details on the default settings, refer to Defaults by Drive Model Selection (o2-04) on page 87.
Name Setting Range Default
L2-04
Momentary Power Loss Ride-Thru Voltage Recovery
Ramp Time
0.0 to 10.0 s Determined by o2-04
<1>
M
R
S
T
10
14
U
V
W
L1
L2
L3
UV Detection
Relay
9 - KEB Command 1
13 - Run command
MV1000ParameterGuide_E_conditional.book 204 ページ ２０１３年１０月１１日 金曜日 午後８時１８分
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