YASKAWA A1000 Series Technical Manual page 253

KEB Operation Wiring Example
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Figure 5.95 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 terminal S6 (H1-06 = 65, 66, 7A, 7B). Note that an
additional dynamic braking option is required if System KEB Ride-Thru 1 is used.
Note: 1. Make sure the Run command is not switched off during momentary power loss. If the Run command is shut off, the drive will not
accelerate back to speed when the power is restored.
2. A dynamic braking option is required in order to use System KEB 1 (L2-29 = 2).
Figure 5.95
Parameters for KEB Ride-Thru
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Table 5.40 lists parameters needed to set up KEB Ride-Thru depending the type of KEB Ride-Thru selected in L2-29.
Parameter Name
C1-09 Fast Stop Time
C2-03 S-Curve at Deceleration Start
L2-05 Undervoltage Detection Level
L2-06 KEB Deceleration Time
L2-07 KEB Acceleration Time
L2-08 Frequency Gain at KEB Start
L2-10 KEB Detection Time
Desired DC Bus Voltage
L2-11
during KEB
L3-20 Main Circuit Adjustment Gain
Accel/Decel Rate
L3-21
Calculation Gain
L3-24 Motor Acceleration Time
L3-25 Load Inertia Ratio
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
B1
R/L1
L1
L2 S/L2
T/L3
L3
UV Detection
Relay
S6 - KEB command 1 or 2
S1 - Start command
SC
Figure 5.95 KEB Function Wiring Example
Table 5.40 KEB Function Related Adjustments
• Increase if an overvoltage fault (ov) occur during KEB deceleration.
• Decrease if an undervoltage fault (Uv1) occurs during KEB deceleration.
• Shorten if undervoltage (Uv1) occurs right after KEB Ride-Thru is triggered.
• Lengthen this setting if overvoltage occurs right after KEB operation starts.
Increase if an undervoltage fault (Uv1) fault occurs at KEB operation start in order to
let the drive detect power loss more quickly.
• Increase if an overvoltage fault (ov) occur during KEB deceleration
• Decrease if an undervoltage fault (Uv1) occurs during KEB deceleration
Adjust to the desired acceleration time. If set to 0, standard acceleration times are used
(C1-01, C1-03, C1-05, C1-07).
• Increase if an undervoltage fault occurs right after KEB operation starts.
• Decrease if an overvoltage fault occurs right after KEB operation starts.
• Increase when a digital input is set for KEB Ride-Thru and an undervoltage fault
occurs after power was lost because the device that controls the input does not react
quickly enough.
• If the DC bus voltage overshoots after KEB Ride-Thru begins (and no input terminal
is set to KEB Ride-Thru), increase L2-10 to longer than the overshoot.
• Set to around 1.22 times the input voltage for Single Drive KEB Ride-Thru 2.
• Set to around 1.4 times the input voltage for Single Drive KEB Ride-Thru 1 and
System KEB Ride-Thru modes.
• Increase this setting slowly in steps of 0.1 if overvoltage (ov) or undervoltage (Uv1)
occurs at the beginning of deceleration
• Reduce if torque ripple occurs during deceleration while executing KEB Ride-Thru.
• Reduce L3-21 in steps of 0.05 if there is a fairly large speed or current ripple.
• Decreasing this setting too much can result in a slow DC bus voltage control
response, and may lead to problems with overvoltage or undervoltage.
Set the motor acceleration time as described on page
Set the load/inertia ratio as described on page
Braking
Required for System KEB
Resistor
Ride-Thru 1 only (L2-29 = 2)
B2
U/T1
V/T2
W/T3
common_TMonly
Setting Instructions
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261
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261
5.8 L: Protection Functions
M
KEB Mode (L2-29)
0 1 2
YES NO NO
YES NO YES
YES YES YES
NO NO YES
YES YES YES
YES NO YES
YES YES YES
YES YES YES
NO YES NO
NO YES NO
NO YES NO
NO YES NO
3
NO
YES
YES
YES
YES
YES
YES
5
YES
NO
NO
NO
NO
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