Manual Bypass Mode Start-Up Procedures - Delta Modulon DPH series User Manual

immediately. If below 3V, turn on each Delta or non-Delta external maintenance bypass
cabinet's output breaker or switch (Q4).
Now, the tri-color LED indicator illuminates yellow and the LCD shows the following
screen (see Figure 6-13). For the location of the tri-color LED indicator, please refer to
Figure 2-11.
UPS-1.1
Power Flow
Power Flow
Summary
System Status

6.2.4 Manual Bypass Mode Start-up Procedures

WARNING:
1. For parallel units, ensure that every operation procedure mentioned below is
synchronized to all parallel UPSs.
2. For parallel application, if you just want to operate a specific UPS but not all
parallel ones, please contact service personnel.
3. Please note that you can turn on the Delta or non-Delta external maintenance
bypass cabinet's manual bypass breaker or switch (Q3) only when the UPS
needs maintenance. In manual bypass mode, the connected critical loads will be
supplied by the manual bypass and the output won't be protected. Please ensure
that the bypass AC source is normal.
4. In manual bypass mode, the connected critical loads will be supplied by the
manual bypass; thus, maintenance personnel can perform maintenance without
interrupting the power supplying to the critical loads.
5. Ensure that all of the breakers and switches (except the Delta or non-Delta
external maintenance bypass cabinet's manual bypass breaker or switch (Q3))
are in the OFF position, and use a voltmeter to check there is no high voltage
inside the UPS. Only after confirmation can service personnel perform UPS
maintenance.
6. Please note that, during UPS maintenance process, the Delta or non-Delta
external maintenance bypass cabinet has high voltage. Do not touch the Delta or
non-Delta external maintenance bypass cabinet to avoid electric shock.
MEASUREMENT SETUP MAINTENANCE
POWER FLOW
Maintenance
Bypass
Bypass
Mains
90 %
5 mins
(Figure 6-13: Bypass Mode Screen)
LOG IN EVENT LOG
User
6-13
6 UPS Operation
10:15
May 25,2018
Bypass
Load
30 %