Huawei UPS5000-E-12 User Manual page 130

UPS5000-E-(40 kVA-320 kVA)
User Manual




Bypass Parameter Settings
Set bypass parameters, such as the bypass voltage and frequency range, as shown in
4-37.
Figure 4-37 Bypass Param. screen

Issue 10 (2015-09-15)
voltage adjustment range is ± 5%. The default value is 220.0 when the voltage is 380 V,
230.0 when 400 V, 240.0 when 415 V.
Output freq. track rate (Hz/s)
The value range is 0.1–2.0 Hz/s, and the default value is 0.6 Hz/s.
−
− 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 ± 6 Hz, and the default value is ± 2 Hz.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
4 User Interface
Figure
121