Installation, Operation and Maintenance Manual
IO-70060 RevC 12-17
10
NORMAL OPERATION
Green LED Indicator
Each phase has an LED indicator, which illuminates when the SPD is energized and operating correctly.
SPDs equipped with Neutral-Ground protection include a N-G LED at one end of the translucent white
label window. SPDs without N-G protection such as those for Delta power systems do not include
this feature. 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.
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
