42 Eaton SPD Series for Mounting External to Electrical Distribution Equipment Installation Manual IM01005031E—Rev 09
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Many SPD failures result from improper installation. Once the SPD is installed properly, it is a highly reliable
unit.
If the SPD does not function properly, first confirm that it is installed properly. See Chapter 2 Installation.
If the SPD malfunctions after it has been operating routinely, refer to Table 3. This troubleshooting chart
identifies possible causes and solutions to the malfunction. Further assistance may be obtained by calling
Eaton’s Applications Engineers, at 1-800-809-2772 or email SPD@eaton. com, including being directed to the
warranty process if applicable.
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Green LEDs ON (1 per phase) and one green LED
ON for neu/gnd protection
Normal operation. N/A.
Audible alarm OFF, form C (N.C.) contact in the
CLOSED state
.
Normal operation. N/A.
Phase green LED is OFF, same phase red LED is
ON, audible alarm is ON.
Phase protection compromised or lost .
Extended temporary overvoltage (TOV).
Replace SPD.
Check electrical system for TOV
sources, correct, replace SPD.
Significant surge event. Replace SPD.
Neu/gnd green LED is OFF, neu/gnd red LED is
ON, audible alarm is ON (for models with
neutral connections).
Neu/gnd protection is compromised or
lost. .
Replace SPD.
Significant surge event Replace SPD.
All phase green LEDs OFF, all phase red LEDs
ON, audible alarm is ON.
All phase protection is compromised or
lost.
Replace SPD.
SPD rated voltage is less than system
voltage. .
Replace SPD with correct voltage
model .
Extended temporary overvoltage (TOV) Check electrical system for TOV
sources, correct, replace SPD.
Significant surge event. Replace SPD.
One of the display red LEDs is ON. audible alarm
is OFF.
Audible alarm silence button has been
depressed and alarm is silenced.
Normal operation
If power is cycled and a fault
condition still exists, the audible
alarm will reactivate.
All green and red LEDs are OFF, LCD display (on
Surge Counter models) is OFF.
SPD is not connected to a power source. Check system voltage at SPD
connection.
Check SPD connections.
One phase has neither a green or red LED lit. Ribbon cable is not connected properly.
Ribbon cable is mis-aligned with
connector.
Verify ribbon cable and connector
are properly aligned and fully
seated together.
All phase LEDs are green, audible alarm is on. Insufficient voltage to the power supply. Replace SPD.
Troubleshooting
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