APC CP16, CP27 Output Power and Communication Signals

The audible alarms may be silenced by utilizing the dual function Replace Battery/Alarm Silence

LED/button /.

Function Button Operation

(Press and hold for:)

Description

Replace Battery-

Temporarily

Enable/Disable

<4 seconds If the alarm has been silenced, th e unit will

emit one quick beep. If the alarm has been

enabled, two quick beeps will be emitted.

Replace Battery-

Permanently

Enable/Disable

8-12 seconds If the alarm has been silenced, the unit will

emit one quick beep. If the alarm has been

enabled, two quick beeps will be emitted.

Battery Self-Test-

Enable/Disable

4-8 seconds If the self-test has been enabled, three beeps

will be emitted. If the self-test cannot be

enabled, a single beep will be emitted.* If the

battery self-test has been canceled, the unit

will emit four beeps.

*A battery self-test cannot be enabled unless the following conditions have been met.

1. Battery has been charged for at least 31 hours.

2. The unit has been on utility power for more than 12 hours.

3. Temperature is between 0 and 50°C.

Output Power and Communication Signals

The PowerShield communication signals are isolated from its internal circuitry via open collector

opto-coupled transistors. The connection labeled “Signal Return” is a common return point for all

communication signals. In the typical application, the attached equipment digital ground connects to

Signal Return, and pull-up resistors turn the open collector signals into logic levels.

+Voltage output

 Voltage output

Signal return.

Low when operating from utility line. Open when operating from

battery.

Low when battery is charged. Open when battery fails the Self-Test.

Low when battery is present. Open when battery is missing.

Low when battery is near full charge capacity. Open when operating

from a battery with less than 20% of available runtime remaining.