Installation, Operation and Maintenance Manual
IO-70103 RevE 08-17
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Corrective Maintenance:
The ASCO Series 500 SPDs are designed for years of trouble-free operation.
However, even the most reliable equipment may fail under abnormal conditions. Diagnostic indicators are
provided to indicate when the unit needs repair or replacement. To ensure continuity of surge protection,
failed units should be repaired or replaced at the earliest convenient service opportunity. When replacing
surge modules, other components should be inspected for damage and replaced if necessary. Standard
electrical trouble-shooting procedures should be used to isolate problems other than failed surge current
diverter modules. When replacing components, use identically rated components for continued proper
operation and safety. Please contact factory for information on replacement parts.
Preventative Maintenance (Inspection and Cleaning):
Periodic system inspections, cleaning, and
connection checks are recommended to ensure reliable system performance and continued surge
transient protection.
It is difficult to establish a schedule for preventative maintenance since conditions vary from site to site.
Inspections for failed surge modules using available diagnostics should be done routinely (weekly or
monthly).
