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Smart 16e Shelf User Manual Installation of Controller Card

Alarm Connections

The terminal strips located on the back of the Smart 16e Shelf controller card are labeled ALARM. They

are used for audio or visual alarm indicators provided by the user. The top two terminals are a set and the

bottom two are a set. The terminals are activated together when the cards inserted in the designated slots

encounter an alarm condition such as primary link failure.

To verify operation of the terminal strip, measure the impedance across each set. The impedance should be

open when the shelf is not in alarm and shorted (approximately 0.6 ohm) when in alarm. The two alarm

sets operate identically and should have the same impedance. The power specifications for any alarms used

are NEC Class 2 and 48 VDC @ 500 mA maximum. Figure 2 shows the alarm connection.

Figure 2. Alarm Connection

Power

Source

Power

Source

larm Relay

SMART 16e

POWER I/F

ALARM

COM

250V

3AG

115VAC/60 HZ

2.5 AMP

10 BASE T

FUSE

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