Input Phase Loss Detection; Standard Input Phase Loss Detection; Dv/Dt Method Input Phase Loss Detection - YASKAWA L1000A CIMR-LC F Series Technical Manual Addendum

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Input Phase Loss Detection

The drive offers two different methods to detect a possible Input Phase Loss.

• Standard Input Phase Loss Detection

• dv/dt Method Input Phase Loss Detection

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Standard Input Phase Loss Detection
The drive evaluates the DC Bus voltage to detect Input Phase Loss. In intervals of 1 second, the drive determines
the minimum and maximum DC Bus voltage. If the difference between minimum and maximum continuously
exceeds a threshold value for 10 seconds, the drives considers an Input Phase Loss.
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Related Parameters
Use the following parameters to use and adjust Standard Input Phase Loss Detection. Parameters are available
when A1-01 = 2 [Access Level Selection = Advanced Access].
Parameter Operator Display
L8-06 Inp Ph Loss Lvl
L8-42 In Phase Loss T
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dv/dt Method Input Phase Loss Detection
The dv/dt Method Input Phase Loss Detection can detect input phase loss immediately at start and before opening
the brake. The drive evaluates the voltage deviation (ΔV/Δt), this means the drive evaluates the voltage change
within a fixed small time frame (e.g. with a sampling time Δt = 5 ms). When the ΔV/Δt value exceeds a set
negative threshold for a certain number of times, the drive detects an Input Phase Loss. The drive also detects
negative values for ΔV/Δt to detect unusual voltage drops.
Set the ΔV/Δt threshold with L8-70. This setting is independent from speed and load.
YASKAWA TOEPC710616134G AC Drive L1000A Technical Manual Addendum
Figure 10.1 Standard Input Phase Loss with L8-42 = 10 (Example)
Description
Input Phase Loss Detection Level
Defines the difference between the maximum and minimum values of the DC
Bus ripple for detecting input phase loss.
Default value for L8-06 depends on drive model.
Input Phase Loss Detection Time
Sets the time for detecting input phase loss. PF fault is activated if the DC bus
voltage ripple exceeds the value defined with L8-06 for the time in seconds
defined with L8-42.
Figure 10.2 DC Bus Voltage ΔV/Δt Calculation (Example)
10 Input Phase Loss Detection
Value Range Default Value
0.0 ... 50.0 % Between 14 and 28 %.
0 ... 255 s 2 s
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