American Power Conversion PM3, PM4Y DB-9 Relay Contact Pin Configuration, Surge Counter Option

Surge Counter Option

In units so equipped, the surge counter option provides a means to total the number of transient voltage surges encountered since the counter was last reset. The surge counter circuitry includes a “supercap”. This will provide power up to four days to retain memory should a power outage occur. NOTE: There is a 10 - 15 minute charging cycle once power is connected, before the surge counter operates. The surge counter registers the sum of L-N and L-G transient surges. There are Count and Reset touchpads. Pressing the Count touchpad increments the counter by one. Pressing the Reset touchpad resets the counter to zero count.

Dry Contacts Option

The PM Series is available with optional Dry Contacts which utilize a DB-9 connector. This feature provides two sets of both 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 by changing state when there is an alarm condiiton.. Examples could include a computer interface board, an emergency management system, etc. The relay contact pin arrangement is outlined in Table 3. (Please note the jumpered connections. Pins 7, 8 & 9 do not represent a third set of contacts.)

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 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. If you have design questions, please contact APC at: 1-800-800-4APC.

Table 3: DB-9 Relay Contact Pin Configuration

P I N	CONTACT TYP E
1	No rm al l y Cl o s e d (1)
2	Co m m o n (1)
3	No rm al l y Op e n (1)
4, 7	No rm al l y Cl o s e d (2)
5, 8	Co m m o n (2)
6, 9	No rm al l y O p e n (2)

NOTE: 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.

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