Advanced Protection HPS - Manual (Page 8)

NEMA 3R Drain Holes for Standard Steel Enclosure
In order to maintain a UL 3R rating, two 0.25” (6mm) holes
must be drilled in opposite corners of the bottom surface
of the enclosure. Take care to not damage internal SPD
components. Remove any drilling remnants. (Do not perform
on other enclosures or ratings.)
Optional Flush Mount Installation Considerations
The HP and HPS are approximately 6” deep. The unit will not
mount flush unless there is as least 6” of depth clearance.
They are not designed to mount flush on a typical 2 x 4
stud wall.
Back Flange Mounting: Mount as close as possible to
protected panel. Create a wall opening slightly larger than
12”(350mm) x 12”(305mm). See drawing. Configure a robust
backing plate inside the wall cavity 6”(152mm) from the wall
face such that the SPD is supported from its back. Note the
mounting holes on the back flange. Also note that the HP
and HPS weigh 25 lbs. Be careful not to drop the SPD into
the wall. See Figure 4.
Retro-fit Into Existing Panel with No Available
Breaker Positions
These can be difficult with limited options because all
applicable Codes must be followed:
• Consider consolidating loads in a manner that might
free breaker positions.
• A ten foot tap rule in NEC ® 240.21(B)(1) allows you
to tap the bus as long as the conductors are rated at
least 10% of the ampacity of the panel. This works
well if the panel is about 600A or less: Tap the bus, run
short 6 AWG leads to the SPD. A Disconnect Switch
or Safety Switch allows for easier SPD servicing in
the future. If the panel starts getting large (>800A),
then the conductors may also become too large to fit
into the SPD lugs or too cumbersome to work with.
Consider tapping the bus per NEC ® 240.21(B)(1).
Run appropriate size conductors to a safety switch
fused to 60A. Mount the SPD immediately adjacent
to the safety switch. Connect SPD to the load side
of the safety switch with 6 AWG. Keep all leads as
short as possible.
• In no-win situations, consider asking the Authority
Having Jurisdiction (AHJ). Some AHJ’s appreciate
SPD safety benefits on smoke detectors, medical
equipment, security equipment, etc. Similarly, some
AHJ’s appreciate the financial distress of failed
microelectronic loads. Depending on situation, an AHJ
might approve the ‘lesser of two evils’.
OPERATION
Control and Diagnostic Panel
All indicators and controls are located on the front diagnostic
panel. Each phase features a Green LED indicator. Green
LEDs indicate correct operation.
If an inoperative condition were to occur in the HPS, the
green LED(s) will extinguish.
If an inoperative condition were to occur in the HP, the
built-in audible alarm will sound and the red Service LED
will illuminate. This indicates that the unit needs evaluation
by a qualified electrician or technician. Until a qualified
person evaluates the unit, press Alarm Silence to silence
the alarm. (The LED above Alarm Silence illuminates when
the alarm is deactivated. Normal operation occurs with the
Alarm Silence LED extinguished.) 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 (if equipped).
If LEDs are illuminated in a manner that suggests
contradictory information, there may be an internal logic
problem and the unit needs replaced. If none of the LEDS
are illuminated, the unit may not be installed correctly. If a
green LED is not illuminated and is suspected of being faulty,
a qualified electrician may attempt to diagnose the problem
by deenergizing the unit, opening the door and swapping
ribbon cable leads. 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).
FLUSH MOUNT INSTALLATION Figure 4
Figure 3
NEMA 3R DRAIN HOLES
Flush Mount front view
Flush Mount Side View
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