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This procedure assumes that the load is being supplied by
the bypass AC input (mains 2) source via the SSC.
Start the UPS modules (refer to Section 2.4.2, steps d1 to d4).
On the SSC hidden panel, press the “security” key (Figure
2-8, “key” pushbutton) and hold it while pressing the “forced
bypass to inverter” key (pushbutton #4). If enough modules
are on, the load will be disconnected for 0.8 seconds, then
connected to the UPS modules.
On the UPS hidden panel, press the “security” key (Figure
2-8, “key” pushbutton) and hold it while pressing the “forced
inverter to bypass” key (pushbutton #5). This stops the
inverter and disconnects the UPS module. When all
modules are stopped, the load will be disconnected for 0.8 seconds, then connected to the
bypass AC input source.
This section presents the most common alarm messages
that appear on the LCD (the alphanumeric section of the
“hidden” panel), and explains their meaning.
LOAD IS PROTECTED
UPS IS ON LINE
This is the normal display message. There are no alarms or problems, and the load
is being supplied by the UPS inverter.
2.5 LCD Messages
When one UPS module in a shared system is shut
down, it may cause the remaining modules to enter
an overload or current-limiting condition, if they
are unable to fully support the attached load. The
remaining modules may shut down after a certain
time or immediately (depending on the load level),
and the load may be transferred to the bypass AC
input source.
IMPORTANT
2.4.6.3 Forced UPS Module
Shut Down
2.4.6.2 Forced Transfer
From Bypass
AC Input Source
to Inverter
2 — 37Operation
User’s guide