Bypass Mode_ Single Input_ Single Unit; Manual Bypass Mode_ Single Input_ Single Unit - Delta Modulon DPH Series User Manual

3.1.3 Bypass Mode_ Single Input_ Single Unit

When the inverter encounters abnormal situations such as over temperature, overload,
short circuit, abnormal output voltage or low battery, it will automatically shut itself down.
If the UPS detects the bypass AC source is normal, it will automatically switch to Bypass
mode to protect the connected critical loads from power interruption. Please refer to Figure
3-3. After the above-mentioned abnormalities are eliminated, the UPS will switch back to
On-Line mode from Bypass mode. During Bypass mode, the UPS's tri-color LED illuminates
yellow and the text 'Bypass' appears in the upper right corner of the screen.
MAIN
Batteries

3.1.4 Manual Bypass Mode_ Single Input_ Single Unit

Modulon DPH Series
Q3
Q2
Q1
Q5
(Figure 3-3: Bypass Mode Diagram_ Single Input Single Unit)
WARNING:
1. In Manual Bypass mode, make sure that all of the breakers (except the Manual
Bypass Breaker (Q3)) are in the OFF position before working on the UPS's
internal circuits. This avoids electric shock.
inside the UPS and maintenance can be performed safely. However, to avoid
electric shock, please do not touch the following parts: AC Input terminal block,
Bypass Input terminal block, UPS Output terminal block, Battery Input terminal
block, grounding terminals (see Figure 5-8~Figure 5-11 for the location of
these terminal blocks and terminals) and any copper bars connected to the
Manual Bypass Breaker (Q3), as they may carry high voltage.
the connected critical loads are not protected.
Static Switch
Rectifier Inverter
3-4
LOAD
Q4