Datasheet

18
Installation and Operation Manual
Audible Alarm Push the alarm enable/disable button to enable or disable the alarm (see
Figure 8). If the green alarm LED is lit the alarm is enabled. If the green alarm
LED is not lit the alarm is disabled.
Surge Counter The surge counter displays the number of transient voltage surges since the
counter was last reset. The counter is battery powered to retain memory in the
event of a power loss to the diagnostic display panel. To reset the surge counter
remove all power and press the small switch located inside the unit on the
underside of the diagnostic circuit board near the RJ45 connectors (also refer to
Figure 9). This will reset the counter to zero.
Dry Contacts The SurgeArrest
®
series SPDs come standard with dry contacts. The
connection for the dry contacts is located on the back of the diagnostic display
panel (lower right corner). The dry contacts are 3-position, Form “C” type with
Normally Open, Normally Closed and Common connections. In the unpowered
state the contact is closed between terminals NC and COM. This is also the
alarm condition. The opposite state, closed between terminals NO and COM,
indicates that power is on to the unit and that no alarm condition exists (See
Table 5). These contacts can be used for remote indication of the SPD’s
operating status to a computer interface board or emergency management
system. Also, these contacts are designed to work with the SPD remote
monitor option described below.
The dry contacts are designed for a maximum voltage of 24 Vdc / 24 Vac and a
maximum current of 2 A. Higher energy applications may require additional
relay implementation outside the SPD. Damage to the SPD’s relay caused by
use with energy levels in excess of those discussed in this instruction bulletin
are not covered by warranty. For application questions, contact APC Technical
Support at 1-800-800-4272.
Figure 8: Three-Phase Diagnostic Display Panel with Surge Counter
Figure 9: Rear of Diagnostic Circuit Board
Phase LEDs
Description of
phase LEDs
Alarm LED
Enable alarm
Disable alarm
Surge counter reset
switch (on diagnostic
circuit board)
On-line diagnostic
push buttons
Surge counter
Alarm
enable/disable
push button
NOTE: Phase B is not present on
single-phase applications
Dry
contacts
RJ45
Connectors
Surge counter
reset switch
(white)
Operation