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9 – Start-Up, Shutdown and Bypass (continued)
9-8 Start-Up Procedure (Parallel UPS) (continued)
Switch on the bypass input circuit breaker switch •
A
of each
UPS system. After a brief initialization process, the LCD screen
will show “ON AUTO BYPASS” and the “BYPASS” LED will
illuminate.
Switch on the main input circuit breaker switch •
A
of each UPS
system.
Press the ON button •
A
of one of the UPS systems for 3 seconds
(until you hear a beep), then release the button. The inverter will
activate and synchronize with the bypass source. Press the ON
button for the other UPS system for 3 seconds (until you hear a
beep), then release the button. When the inverter of each UPS
system is operating normally, they will automatically switch from
auto bypass (reserve) mode to online (normal) mode at the same
time. The “BYPASS” LED will darken and the “NORMAL” LED
will illuminate.
Check the output voltage of each UPS system. The phase deviation •
between each UPS system should be less than 5V. If the phase
deviation is within the acceptable range, switch on the output
circuit breaker switch
A
of each UPS system. Note: For more
information on checking the output voltage of each UPS system,
see Section 10-6.
9-9 Shutdown Procedure (Parallel UPS)
Warning: The UPS system shutdown procedure will eliminate the AC power output for all loads. Before shutdown, confirm that all loads
are turned off or place the UPS systems in manual bypass mode to keep loads powered by the bypass (reserve) power source.
For the UPS system you wish to shut down, press the OFF button •
A
for 3 seconds (until you hear a beep), then release the button.
If the other UPS system can support the connected equipment
loads alone, the UPS system that was turned off will shut down its
inverter and its LCD screen will read “LOAD NOT POWERED”.
The other UPS system’s LCD screen will read “ONLINE MODE”.
If the total connected equipment load is too large to be handled
by a single UPS system, both UPS systems will shut down their
inverters and switch to bypass mode, and their LCD screens will
read “ON AUTO BYPASS”.
For the UPS system you wish to shut down, switch off the main •
input circuit breaker switch
A
, then switch off the output circuit
breaker switch
B
.
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Output Manual
Bypass
Bypass
Input
Main
Input
A
Output Manual
Bypass
Bypass
Input
Main
Input
A
A
Output Manual
Bypass
Bypass
Input
Main
Input
A
A
Output Manual
Bypass
Bypass
Input
Main
Input
AB
200706017 93-2688 SU manual 4C.indd 29200706017 93-2688 SU manual 4C.indd 29 11/29/2007 2:02:48 PM11/29/2007 2:02:48 PM