Dry Contacts Option
The Dry Contacts option utilize a DB-9 connector. This feature provides two sets of both normally open (NO) and
normally closed (NC) contacts through the DB-9 connector. These relay contacts can be used for remote indication
of the SPD’s operating status by changing state when there is an alarm condition. Examples could include a computer
interface board, an emergency management system, etc. The relay contact pin arrangement is defined in Table 3.
(Please note the jumpered connections. Pins 7, 8, & 9 do not represent a third set of contacts)
For custom applications using Dry Contacts, please note the following information: The Dry Contacts are designed
for low voltage or control signals only. Maximum switching current is 1 amp. Maximum switching voltage is 24
volts, DC or AC. Higher energy application may require additional relay implementation outside the PM. Damage to
the PM’s relay caused by implementation with energy levels in excess of those discussed in this manual will not be
covered by warranty.
Corrective Maintenance (Repair)
Surge Protection Devices (SPD) are designed for years of reliable, trouble-free operation. Unfortunately, even the
most reliable equipment can fail.
Built-in diagnostics are an integral part of the SPD and will aid in isolating which of the protection module(s) have
failed. To keep the SPD operating at peak performance, replacement of any bad module should be performed accord-
ing to surge module removal and replacement instructions at the earliest service opportunity.
If a single module on a particular phase fails, the fuse takes the module off-line. It is recommended by APC that if a
module fails on any specific phase, that all modules be replaced at the same time, according to module removal
instructions that follow.
Standard troubleshooting procedures should be used to isolate other problems not associated with failed modules.
See Figure 5 (Troubleshooting Flowchart) for assistance. Replace bad components with identically rated parts to
continue proper operation and safety. It is very important that fuses be replaced with the exact fuse specified on
the fuse replacement warning label shipped with each unit. This label is found on the SPD mounting plane.
After all failed modules have been replaced, prior to returning power, inspect the entire SPD for other damaged com-
ponents and replace as necessary. Table 4 lists typical replacement parts.
Troubleshooting
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