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IM01005012E XT-40 & IT-RSS Installation
Page 8 Rev. 1 – 2/2007
2.8 Power Up and System Checkout
Apply system power and observe that the LED(s) on the front of the SPD should glow. One LED should
glow for each Phase voltage being monitored.
Should there be a significant difference in brightness, check the phase rotation of the panel and ensure
that the SPD’s Phase wires are connected to the correct phase. Slight differences in brightness DO NOT
indicate a faulty device, rather specification tolerance differences of the indicator circuit’s components.
LED brightness symmetry and/or level do not indicate the SPD’s operational status.