Manual Bypass Mode_ Single Input_ Parallel Units - Delta Modulon DPH series User Manual

3.1.12 Manual Bypass Mode_ Single Input_ Parallel Units

In Manual Bypass mode (parallel), if one of the parallel UPSs needs maintenance, please
After confirmation, please follow the procedures below to manually switch each of the
parallel UPSs to Manual Bypass mode.
1 Tap each LCD's ON/ OFF Button (
2
Turn ON each UPS's Manual Bypass Breaker (Q3).
3
Turn OFF each UPS's Bypass Breaker (Q2).
4
Turn OFF each UPS's Input Breaker (Q1) and Output Breaker (Q4).
5
Turn OFF each external battery cabinet's breaker (Q5).
In Manual Bypass mode, all power inside the parallel UPSs is completely cut off and
maintenance personnel can perform maintenance safely. Power of the connected critical
loads will be supplied by manual bypass. During Manual Bypass mode (parallel), all parallel
power through the parallel UPSs in Manual Bypass mode.
Modulon DPH Series
WARNING:
1. In Manual Bypass mode, make sure that all of the breakers (except each
Manual Bypass Breaker (Q3)) are in the OFF position before working on any of
the parallel UPSs' internal circuits. This avoids electric shock.
no high voltage inside all parallel UPSs and maintenance can be performed
safely. However, to avoid electric shock, please do not touch the following parts
on each parallel UPS: AC Input terminal block, Bypass Input terminal block,
UPS Output terminal block, Battery Input terminal block, grounding terminals
(see Figure 5-11~Figure 5-13 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.
3. During Manual Bypass mode, each parallel UPS's input power is completely
4. For parallel UPSs, if you want to turn off one of the parallel UPSs for
maintenance, please make sure the total connected critical loads will not
exceed the remaining parallel units' total capacity.
) and the 'POWER OFF?' screen will pop up to
Figure 3-12 for the path of electrical
3-12
'YES'.