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To shut down an individual UPS module, press the “inverter
off” pushbutton on the module front panel for 3 seconds. To
restart, press the “inverter on” pushbutton. Note that the transfer will occur only if the inverter is
synchronized to the bypass; otherwise, a forced transfer is needed (see Section 2.4.6).
To isolate an individual UPS module for maintenance
(allowing the remaining UPS modules to maintain the
attached load), follow this procedure (starting with all UPS
modules operating normally, supplying the attached load):
1. Stop the inverter by pressing the “inverter off” pushbutton on the UPS module front
panel for 3 seconds. The audible alarm will sound; silence the alarm by pressing
the audible alarm reset pushbutton on the hidden panel (see Section 2.2.3). If the
transfer conditions are not satisfied (bypass out of tolerance or other reason), a
forced transfer is required; refer to Section 2.4.6, Forced Transfers.
2.4.5.1 Isolation of
an Individual
UPS Module
2.4.5 Isolation for
Maintenance
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 — 33Operation
User’s guide