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26 Installation Guide APC Silcon 240-320kW 480V UPS
990-4049
External Connection
• This auxiliary contact is also called “Normally Open” (NO), because the auxiliary
contact will be open when the main contacts are open
• Please note that the above term “NORMALLY” has nothing to do with NORMAL
UPS OPERATION MODE
When switching Q003 from “OFF or 0” to “ON or 1”, the auxiliary contact has to open BEFORE
the corresponding main contacts are closed. When switching Q003 the opposite way from “ON
or 1” to “OFF or 0”, the auxiliary contact has to close with a maximum delay of 0.5 seconds from
the time when the corresponding main contacts are opened.
• This type of auxiliary contact is called an “early break” contact. (This also means that
it will “make late” when activated in the opposite direction)
• The auxiliary contact is also called “Normally Closed” (NC), because the auxiliary
contact will be closed when the main contacts are open
• Please note that the above term “NORMALLY” has nothing to do with NORMAL
UPS OPERATION
X005 (output relays)
The battery operation signal is received with a 30-second delay. This function is inactive
during battery tests. Common fault relay facility is programmable (standard factory
setting: 10 sec.) See APC Silcon User Guide for details.
Maximum nominal voltage on contact circuits is 277VAC. If two different phases are involved,
maximum phase to neutral voltage should be below 160VAC. Please note that phase L1 is
already present on the System Integration Interface board, supplied from the Service Bypass
Panel. Therefore, if a phase is needed for alarm or signal purposes, Phase L1 should be used”.
Terminals X001, X003, X005, X004, X012:
Cable size AWG18 to AWG14, use solid copper conductors only.
CAUTION!
All wiring to alarm and signal circuit fields to be rated 300V (minimum).