Strain Relief; Powering Up; Grounding And Power Surge Protection; Backup Battery - Phonetics SENSAPHONE EXPRESS II User Manual

STRAIN RELIEF

Strain relief clamps are provided on the Express II enclosure to prevent wiring from being pulled
from the circuit board or damaged when passing through the enclosure. To use the strain relief,
thread wires through the clamp and the clear rubber bushing. Position the bushing in the clamp
and tighten the screws on either side so that the wiring does not move. See Figure 2 below:

POWERING UP

Express II is provided with a 12V AC power transformer. This should be plugged into a 117V AC
outlet, +20%, 60HZ.
The transformer is pre-wired to the terminals labelled AC.

GROUNDING AND POWER SURGE PROTECTION

Express II should be earth grounded by connecting a true earth ground to the terminal labeled
EG. This is not essential for Express II to operate, but it is necessary to prevent possible dam-
age by a lightning strike.
The Sensaphone ® Express II can be damaged by power surges and lightning through the tele-
phone line and the power supply. Although Express II has built-in surge protection, we strongly
recommend that additional protection be obtained for the unit and for any electronic equipment
that is attached to your power supply and telephone lines. Power surge protection is especially
important if you live in a lightning-prone area. Surge protection is available through Phonetics.
Call for details.

BACKUP BATTERY

Express II has a 12V 3AH sealed lead-acid Gel-Cell rechargeable battery. This will provide
approximately 6-12 hours backup time. Actual backup time will depend upon the number of
input/output cards installed in the unit, the number of sensors being powered from the unit,
temperature, battery age, and dialing activity. The battery comes pre-wired with the red wire
attached to the BAT IN(+) terminal and the black wire attached to the BAT IN(-) terminal.
Express II will automatically charge the battery whenever the power switch is turned on and the
power transformer is plugged in. The unit also includes special circuity to prevent the battery
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4 Sensaphone Express II User's Manual
top plate
clamp screw
bottom plate
clear rubber bushing
wiring
Figure 2: Strain relief clamp