Advanced Protection XDS - Manual (Page 9)

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The red service LED will remain illuminated even
though the Audible Alarm has been silenced. Test
tests the red service LED, the Audible Alarm and
changes the state of Dry Contacts.
Diagnostics include N-G voltage sensing. If N-G
voltage is excessive, the Phase A LED will blink.
If LEDs are blinking, shut down power and verify
upstream N-G bonding per the NEC ® . Excessive
N-G voltage suggests a fundamental power
problem needing correction. This can/will damage
the SPD.
If LEDs are illuminated in a manner that suggests
contradictory information, there may be an internal
logic problem and the SPD needs replaced. If
none of the LEDs are illuminated, the SPD may
not be installed correctly. For troubleshooting
assistance, please contact APT Technical Support
at (800) 237-4567.
Surge Counter Option
The surge counter registers the number of
transient overvoltages on all L-N and L-G modes
since the counter was last reset. The counter is
inductively coupled from each mode of protection.
It increments upon significant current change in a
short time period (large di/dt).
The surge counter includes Count and Reset
touchpads. Pressing Count adds one count.
Pressing Reset clears the counter’s memory and
resets the display to zero.
The counter includes an Eprom memory chip to
store the surge count in the event of a power loss.
The Eprom requires no maintenance giving it an
advantage over replaceable batteries. The surge
counter display will be blank if all power is lost to
the SPD but will retain the last count shown on the
display once power is returned.
Remote Monitor Accessory Option
A Remote Monitor is available for remote
annunciation. It requires a standalone 120V power
source (wall plug transformer) and uses one set
of Form C dry contacts. The Remote Monitor
can be configured to monitor several APT SPDs
simultaneously. Installation is detailed in a separate
document. Contact factory as appropriate.
Shortest Leads Possible
• Leads must be as short and straight as
possible. - See NEC ® Article 285.12.
• Pretend wire is $1000 per foot coming out of
your pocket.
• No long leads.
• No sharp bends.
• No wire nuts.
• How short is short enough? As short as you
can make it.
• How long is too long? If anyone else can make
it shorter.
MAINTENANCE
SPDs require minimal maintenance. We
recommend periodic inspection of diagnostic
indicators to ensure proper operation. We also
recommend keeping the SPD clean as appropriate.
Troubleshooting & Service
Please contact us for any service related issues.
We want to take care of any problems.
Quality SPDs are designed and tested to withstand
severe duty. However, there are various electrical
anomalies that SPDs cannot protect against.
These are generally Sustained Overvoltages also
known as Temporary Overvoltages (TOVs). In this
context, Sustained Overvoltages may be only a
few cycles. Failed SPDs tend to be symptoms,
not root causes. A failed SPD should be treated
as a ‘canary in the coal mine’ suggesting further
investigation as there may be a larger issue
at play. Regardless of cause, SPDs attempt to
protect their load until failure.
As noted above, the single largest ‘killer’ of SPDs
is reference to ground issues. If the SPD shows
problems on startup, there is reasonable chance
of bonding/grounding/misapplication issue. This
permanently damages the unit. If not corrected, it
will happen again.
Tip: Visually confirm N-G bonding. Be aware that a
voltmeter measuring N-G can be misleading. For example,
N-G voltage could read 0V because neutral and ground are
at the same potential purely by happenstance, not because
they are bonded. Visually confirm bonding.
Tip: Experience indicates that regulation-challenged
generators can cause Sustained Overvoltages, as well
as ungrounded generators, and/or usual load transfer
systems.
There are no user serviceable parts inside. We
strongly recommend against disassembly.
Units may be returned to the factory for factory
service, qualification, and return. Please contact
factory at (800) 237-4567 for assistance.