Huawei UPS5000-A-600K-SC User Manual page 156

UPS5000-A-(600 kVA-800 kVA)
User Manual (40 kVA)
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Bypass Parameter Settings
Set bypass parameters, such as the bypass voltage and frequency range, as shown in
4-33.
Figure 4-33 Bypass Param. screen
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Issue 03 (2017-10-16)
− This parameter can be adjusted based on site requirements. If Output freq. track
rate (Hz/s) is slow, the inverter frequency is different from the bypass frequency
when the bypass frequency changes. If output is overloaded or the inverter is faulty,
an interruption (less than 20 ms) occurs when the UPS transfers from normal mode
to bypass mode. If Output freq. track rate (Hz/s) is fast, the inverter frequency is
unstable.
Self-load output cur. ratio (%)
Set the percentage of the output current to the rated output current when the UPS is in
self-load mode. The value can be 20%–100%, 80% by default.
Output interruption transfer time (ms)
The default value is 0 ms. The transfer from inverter mode to bypass mode takes 1–2 ms,
and the transfer from bypass mode to inverter mode takes 0 to 20 ms.
Max. BPM transfer times
Cross currents occur during the transfer between bypass mode and normal mode, which
impacts the system. This parameter specifies the number of transfers between bypass
mode and normal mode within 1 hour, which ensures system security. The value can be 1
to 10, 5 by default.
Bypass frequency range (Hz)
When the difference between the bypass input frequency and the rated frequency is
greater than this value, the system determines that the bypass frequency is abnormal and
that the bypass is unavailable.
The bypass frequency range must be greater than the ECO frequency range. The value
range is ± 0.5 Hz to ± 6 Hz, and the default value is ± 2 Hz.
Maximum bypass voltage
Upper threshold for the bypass voltage. When the difference between the bypass voltage
and the rated voltage exceeds this value, the system determines that the bypass voltage is
abnormal and that the bypass is unavailable.
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4 User Interface
Figure
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