UPS5000-E-(350 kVA-800 kVA)
User Manual (50 kVA Power Modules)
4 User Interface
Issue 05 (2018-01-08)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
184
Item
Description
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%, and is 80% by
default.
Output
interruption
transfer time
(ms)
The interruption for the UPS to transfer from normal mode to bypass
mode is 1–2 ms, and from bypass mode to normal mode is 0–20 ms. Set
this parameter based on the output interruption time acceptable to loads.
The default value is 0 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, and is 5 by default.
Bypass Parameters
Figure 4-41
Bypass Param. Settings
Item
Description
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 not normal, and that the bypass is unavailable.
The frequency range must be greater than the ECO frequency range. The
value range is ±0.5 Hz to ±6 Hz, ±2 Hz by default.
Maximum
bypass
voltage
When the difference between the bypass voltage and the rated voltage
exceeds the upper threshold for the bypass voltage, the system determines
that the bypass voltage is not normal and that the bypass is unavailable.
NOTE
