Advanced Protection XCS - Manual (Page 4)

4
SPDs on Ungrounded Systems
Caution – Ungrounded systems are inherently
unstable and can produce excessively high line-
to-ground voltages during certain fault conditions.
During these fault conditions, any electrical equipment
including an SPD, may be subjected to voltages
which exceed their designed ratings. This information
is being provided to the user so that an informed
decision can be made before installing any electrical
equipment on an ungrounded power system.
Connecting Optional Form C Dry Contact &
Audible Alarm
Three (3) 3’ (~1m) 18 AWG wires are included
through the nipple with this option. (These are
smaller than the 10 AWG SPD conductors.) Gray
is Common, Blue is Normally Open and Red is
Normally Closed. (We generally recommend the
Normally Closed configuration because it detects
disconnected or failed wiring whereas Normally
Open does not.)
If the Dry Contacts are not utilized, insulate lead
ends, coil and secure. Audible Alarm will still
function correctly.
The contact is rated 250V, 5A. Higher energy
applications require supplemental relaying. This
option monitors suppression element condition
and is not intended for use as phase loss or phase
detection monitoring.
Remote Indication Option
This option includes a supplemental diagnostic LED
that can be mounted in a conspicuous location. For
example, assume that the SPD is mounted such
that it is not readily visible. A Remote Indicator can
provide visual indication of correct operation.
Operation is straightforward: green LED On = SPD
is OK. If the LED is out, the SPD has failed, power is
not present, or one of more phases are not energized.
The green LED assembly includes two pre-attached
wires and two butt-splice connectors. The SPD
includes two yellow 18 AWG wires, pre-wired
through the SPD’s nipple mounting connection.
Pre-plan the installation per normal Installation
Instructions. Mount the LED assembly in an
appropriate conspicuous location. Connect the LED
wires to the yellow SPD wires with the provided butt-
splice connectors. These are not polarity sensitive.
Test by energizing and deenergizing SPD.
NORMAL OPERATION
Green LED Indicators
Each phase’s LED Indicator illuminates when the
SPD is energized and operating correctly. Every
suppression element is monitored and connected
by logic to the LED. Should any suppression
element fail, the green LED will extinguish.
Form C Dry Contact and Audible Alarm Option
Similar to the green LEDs above, the Dry Contact
will change state and the Audible Alarm will sound
upon suppression element failure. The Audible
Alarm may be silenced by removing power to
the SPD.
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 withstand severe duty and attempt to
protect their load until failure. There are 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.
We suggest treating a failed SPD as a ‘canary in the
coal mine’ as there may be larger issues at play. As
a generalization, 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.
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.
Dry Contact
Leads
(18 AWG)
Power Leads
(10AWG)
Blue
Gray
Red
Figure 5
▪
Normally Closed
(suggested):
Use Gray
and Red
▪
Normally Open:
Use Gray and Blue
LEADS
Hazardous voltage.
Will cause death or serious injury.
Keep Out.
Qualified personnel only.
Disconnect and lock off all power before
working on this equipment.
V
DANGER