Manual Bypass Mode_ Dual Input_ Single Unit - Delta Modulon DPH series User Manual

3.2.4 Manual Bypass Mode_ Dual Input_ Single Unit

When the UPS needs maintenance, you can manually switch the UPS to manual bypass
mode. To let the UPS run in manual bypass mode, please follow the procedures below:
1 Confirm that the bypass AC source and the STS module are normal.
2 Press the LCD's ON/ OFF button (
up to ask you if you want to power off the inverter. Please select 'YES'.
3 Turn on the Delta or non-Delta external maintenance bypass cabinet's Manual Bypass
Breaker or Switch (Q3).
4
Turn off the UPS's Bypass Switch (Q0).
5
Turn off the Delta or non-Delta external maintenance bypass cabinet's Input Breaker or
Switch (Q1), Bypass Breaker or Switch (Q2) and Output Breaker or Switch (Q4).
6 Turn off each external battery cabinet's breaker (Q5).
In manual bypass mode, all power inside the UPS is completely cut off and maintenance
personnel can perform maintenance safely. For manual bypass mode diagram, please see
Figure 3-21. During manual bypass mode, the UPS's tri-color LED and LCD are both off.
WARNING:
1. In manual bypass mode, make sure that all of the breakers or switches (except
the Delta or non-Delta external maintenance bypass cabinet's Manual Bypass
Breaker or Switch (Q3)) are in the OFF position before working on the UPS's
internal circuits. This avoids electric shock.
2. After the power inside the UPS is completely cut off, there is no high voltage in
the UPS but in the Delta or non-Delta external maintenance bypass cabinet. Do
not touch the Delta or non-Delta external maintenance bypass cabinet during
UPS maintenance process to avoid electric shock.
3. During manual bypass mode, the UPS's input power is completely cut off and the
connected critical loads are not protected.
) once and the 'POWER OFF?' screen will pop
3-21
3 Operation Modes