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9395P 250 kVA / 275 kVA / 300 kVA
User’s and Installation Guide
7.6
Multiple UPS Distributed Bypass Operation
The paragraphs in this section provide operating instructions for a UPS system
containing multiple UPSs.
7.6.1
Starting the Distributed Bypass System in Online Mode
To start the distributed bypass system:
1.
Unfasten the front door latches and swing the doors open on all of the UPSs (see Figure
4
‐
1
)
2.
If the UPSs contain input breakers (CB1), verify that all input breakers are open.
3.
Close all Module Output Breakers (MOBs).
4.
Close all UPS input feeder circuit breakers.
5.
Close all UPS Bypass input feeder circuit breakers.
6.
If the UPSs contain input breakers (CB1), close all input breakers.
7.
Close the doors and secure the latches.
8.
Observe the UPS control panel displays becoming active, indicating logic power.
9.
On any UPS, press the
CONTROLS
pushbutton on the main menu bar. The System Status
screen is
displayed.
10.
On the System Status screen, verify the UPS status is SHUTDOWN and the UPM
status is
SHUTDOWN.
11.
Close all battery breakers.
12.
Verify no alarms are active.
13.
On the System Status screen, select the
UPS
command.
14.
Press the
CONTROLS
pushbutton on the System Status menu bar. The UPS
Control
Command screen is displayed.
15.
On the UPS Control Command screen, select
GO TO ONLINE
.
16.
Press the
SELECT
pushbutton on the UPS Command menu bar.
If Auto Bypass is enabled (factory default), the critical load is immediately supplied by the
bypass
source in Bypass mode from all UPSs, until the inverter turns on and the UPSs
transfer to Online
mode. The status indicator on the UPS control panel indicates the UPS
is in Bypass mode. If Auto
Bypass is not enabled, the UPS outputs remain off until the
UPSs transfer to Online mode.
17.
Verify the following messages display sequentially on the UPS status line:
DC STARTING, CHARGER OFF
INVERTER STARTING INVERTER
SYNCING ONLINE, CHARGER ON
The rectifier and inverter turn on. The inverter continues to ramp up to full voltage.
Once the inverter reaches full voltage, all UPS output contactors (K3) close and the
bypass circuits
open. Power is now supplied to the critical load in Online mode from all
UPSs. It takes
approximately one minute for the UPSs to achieve Online mode.
NOTE
A Field Installed UPM (FI-UPM) is always designated as UPM 4.
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