Omron Q2A Series Technical Manual page 747

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KEB Operation Wiring Example
Figure 12.125 shows an example that uses an undervoltage relay to trigger the KEB Ride-Thru at power loss.
When a power loss occurs, the undervoltage relay triggers KEB Ride-Thru [H1-06 = 40, 41, 42, 43] at terminal
DI6.
Note:
• A dynamic braking option is necessary for System KEB1 Ride-Thru [L2-29 = 3].
• If you turn off the Run command, the drive will not accelerate back to speed when you return power.
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Parameters for KEB Ride-Thru
Table 12.52 shows the parameters that adjust the KEB Ride-Thru function. Parameter settings are different for the
different KEB methods set in L2-29 [KEB Method].
No. Name
C1-09 Fast Stop Time
C2-03 Jerk@Start of Decel
L2-05 UV Detection Lvl (Uv1)
L2-06 KEB Decel Time
L2-07 KEB Accel Time
L2-08 Frq.Gain@KEB Start
L2-10 Minimum KEB Time
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
Figure 12.125 KEB Function Wiring Example
Table 12.52 Parameters for KEB Ride-Thru
Setting Method
• If ov [Overvoltage] occurs during KEB deceleration, increase the setting value.
• If Uv1 [DC Bus Undervoltage] occurs during KEB deceleration, decrease the
setting value.
• If ov [Overvoltage] occurs immediately after you start KEB deceleration,
increase the setting value.
• If Uv1 [DC Bus Undervoltage] occurs immediately after you start KEB
deceleration, decrease the setting value.
If Uv1 [DC Bus Undervoltage] occurs immediately after you start KEB
deceleration, increase the setting value to detect power loss more quickly.
• Does KEB Tuning.
• If ov or Uv1 occur during KEB deceleration after the KEB Tuning, set L2-06
as follows:
– If ov occurs, increase the setting value
– If Uv1 occurs, decrease the setting value
Sets the acceleration time to return to the frequency reference value before a
power loss, after you cancel the KEB operation. When L2-07 = 0, the drive uses
standard acceleration times set in C1-01, C1-03, C1-05, and C1-07 [Accel Time 1,
Accel Time 2, Accel Time 3, and Accel Time 4].
• If ov [Overvoltage] occurs immediately after you start operation, decrease the
setting value.
• If Uv1 [DC Bus Undervoltage] occurs immediately after you start operation,
increase the setting value.
• With KEB Ride-Thru
There is Uv1 because you set a digital input for KEB Ride-Thru and the device
that controls the input operated too slowly after power loss.
• Without KEB Ride-Thru
If the DC bus voltage overshoots immediately after KEB Ride-Thru starts,
increase L2-10 to longer than the overshoot.
12.8 L: PROTECTION
L2-29 [KEB Method]
1 2 3 4
*1
x - - -
x - x x
x x x x
*2 *2
- - x x
x x x x
x - x x
x x x x
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