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Dry Contact Option

The XGA Series is available with optional Dry Contacts

which utilize a DB-9 connector. This feature provides two

sets of normally open (N.O.) and normally closed (N.C.)

contacts through the DB-9 connector. These relay contacts

can be used for remote indication of the SPD’s operating

status. Examples could include a computer interface

board, an emergency management system, etc. The relay

contact pin arrangement is outlined in Table 2. (Please

note the jumpered connections. Pins 7, 8 & 9 were used

to drive an earlier version of the Remote Monitor option.

Pins 7, 8 & 9 do not represent a third set of contacts. Pin

pairs 4 & 7, 5 & 8, and 6 & 9, are connected via jumper

internally. The combined current of each pin pair may not

exceed 1 Ampere).

An optional Remote Monitor accessory is available that

will provide visual and audible indication of an alarm

condition. The Remote Monitor requires the Dry Contact

option as it collects information through the Dry Contact’s

DB-9 connection. Please note that the DB-9 connector

is completely utilized by the optional remote monitoring

accessory. If the Remote Monitor is used, there will be no

means to interface with another device.

For custom applications using the 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 SPD. Damage to the SPD’s

relay caused by implementation with energy levels in

excess of those discussed in this manual will not be

covered by warranty. If you have design questions, please

contact APT Technical Support at: 1.800.237.4567.

Remote Monitor Accessory Option

A Remote Monitor is available for remote annunciation.

It requires a standalone 120V power source (wall plug

transformer) and uses one set of Form C dry contacts. The

Remote Monitor can be congured to monitor several APT

SPDs simultaneously. Installation is detailed in a separate

document. Contact factory as appropriate.

Figure 16

PINOUT DIAGRAM FOR DRY CONTACTS OF SPD

Using DB-9

Syle Connector:

1 Normally Closed

2 Common

3 Normally Open

4 Normally Closed

5 Common

6 Normally Open

7 Connected to Pin 4

8 Connected to Pin 5

9 Connected to Pin 6

Form C Set #2

Form C Set #1

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 are designed and tested to withstand severe

duty. However, there are various 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. A failed SPD should be treated as a ‘canary

in the coalmine’ suggesting further investigation as there

may be a larger issue at play. Regardless of cause, SPDs

attempt to protect their load until failure.

As noted above, 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.

Tip: Visually conrm N-G bonding. Be aware that a voltmeter measuring

N-G can be misleading. For example, N-G voltage could read 0V

because neutral and ground are at the same potential purely by

happenstance, not because they are bonded. Visually conrm bonding.

Tip: Experience indicates that regulation-challenged generators can

cause Sustained Overvoltages, as well as ungrounded generators, and/

or unusual load transfer systems.

Note: Prior to returning power or servicing the SPD, inspect

the entire SPD for any other damaged components. Any

damaged components should be replaced prior to returning

the SPD to service.