Chapter 3 : Operation Modes; On-Line Mode - Delta DPH Series User Manual

The UPS runs in seven basic operation modes, which are On-Line mode, Battery mode,
Bypass mode, Manual Bypass mode, ECO mode, Frequency Conversion mode and
Green mode.
NOTE:
1. The UPS must be connected with an external maintenance bypass cabinet
(user-supplied, handled and configured by Delta service personnel). For the
external maintenance bypass cabinet's information, please refer to 1.2
Connection Warnings.
2. In this user manual, Q1, Q2, Q3, Q4 and Q5 represent the following.
Code
Q1
Q2
Q3
Q4
Q5
3. To enable the following operation modes, please refer to 6. UPS Operation &
7. LCD Display & Settings.
3.1

On-Line Mode

In On-Line mode, the main AC source supplies AC power via the external maintenance
bypass cabinet's Input Breaker or Switch (Q1) to the rectifier, and the rectifier converts the
AC power to DC power and supplies the DC power to the inverter. In the meantime, the
rectifier provides charging power to the batteries. After receiving the DC power, the inverter
converts it into clean and stable AC power to the connected critical loads via the external
maintenance bypass cabinet's Output Breaker or Switch (Q4). During On-Line mode, the
UPS's tri-color LED illuminates green and the text 'On-Line' appears in the upper right corner
of the LCD screen.

Chapter 3 : Operation Modes

External Maintenance Bypass Cabinet's Input Breaker or Switch.
External Maintenance Bypass Cabinet's Bypass Breaker or Switch.
External Maintenance Bypass Cabinet's Manual Bypass Breaker or
Switch.
External Maintenance Bypass Cabinet's Output Breaker or Switch.
External Battery Cabinet's Breaker.
Meaning
21