Huawei UPS5000-E-400K-SM User Manual page 193

UPS5000-E-(350 kVA-800 kVA)
User Manual (50 kVA Power Modules)
Item
Self-load
output cur.
ratio (%)
Output
interruption
transfer time
(ms)
Max. BPM
transfer
times
Bypass Parameters
Figure 4-41 Bypass Param. Settings
Item
Bypass
frequency
range (Hz)
Maximum
bypass
voltage
Issue 05 (2018-01-08)
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.
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.
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.
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.
Description
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.
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
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