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2.4.6.2 Forced Transfer
From Bypass
AC Input Source
to Inverter
2.4.6.3 Forced UPS Module
Shut Down
modules are stopped, the load will be disconnected for 0.8 seconds, then connected to the
bypass AC input source.
When one U P S mo d u le in a sh a r e d s y st em is s h ut
down, it may cause th e re m ain in g m o d u le s t o en t er
a n ov e r l o a d o r c u r r e n t - l i m i t i n g c o n d i t i o n , i f t h ey
ar e unable to fully s u p p o r t th e a tt ach e d lo a d . T h e
r emaining modules m ay s h u t d ow n af te r a ce r ta in
time or im mediately (d e p en d in g o n th e lo ad leve l),
and the load may b e t r an s fer r e d to th e byp a ss AC
input s ourc e .
2.5
LCD Messages
This is the normal display message. There are no alarms or problems, and the load
is being supplied by the UPS inverter.
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
IMPORTANT
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
Operation
User's guide
2 — 37
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