Manual Bypass Mode_ Dual Input_ Parallel Units - Delta Modulon DPH Series User Manual

3.2.11 Manual Bypass Mode_ Dual Input_ Parallel Units

please follow the procedures below to manually switch each of the parallel UPSs to manual
bypass mode.
Press each LCD's ON/ OFF button (
1
2
Turn on each UPS's Manual Bypass Breaker (Q2).
3
If the end user installs an additional Input Breaker to control the ON/ OFF status of the
4
5
6
7
Turn off each external battery cabinet's breaker and take out every battery module
(optional) from each parallel UPS's battery module slot. For the battery module slot's
location, please refer to 2.6 Internal View. For battery module (optional) information,
please refer to 5.9 Battery Module (Optional). For external battery cabinet
information, please refer to 5.6 External Battery Cabinet Connection Warnings.
In manual bypass mode, all power inside the parallel UPSs is completely cut off and
maintenance personnel can perform maintenance safely. The connected critical loads will
be supplied by the manual bypass. During manual bypass mode, all parallel UPSs' tri-color
parallel UPSs in manual bypass mode.
Modulon DPH Series
WARNING:
1. In manual bypass mode, make sure that all of the breakers and switches (except
each parallel UPS's Manual Bypass Breaker (Q2)) are in the OFF position
before working on any of the parallel UPSs' internal circuits. This avoids
electric shock.
voltage inside the parallel UPSs except each UPS's wiring terminals and
Manual Bypass Breaker (Q2). Do not touch each UPS's wiring terminals and
Manual Bypass Breaker (Q2) during UPS maintenance process to avoid
electric shock.
3. During manual bypass mode, each parallel UPS's input power is completely
) once and the 'POWER OFF?' screen will pop
Figure 3-25 for the path of electrical power through the
3-24
YES'.