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Chapter 2: Installation
top plate
clamp screw
bottom plate
clear rubber bushing
wiring
Strain relief clamp
POWERING ISACC
IMPORTANT: Before applying power to ISACC, the ON-OFF switch must
be in the OFF position. The ON-OFF switch is located to the right of the
acrylic panel, below the power supply terminal block.
ISACC is pre-wired with a three prong cord that can be plugged into any 117VAC
outlet. The power supply specification for the ISACC circuit board is 20 to 24
Volts AC, 50 or 60 Hz. This is applied through the two terminals labeled 24 AC.
ISACC is earth grounded. This is done to help protect it from the possible effects
of lightning strikes in or around the immediate area. A wire is connected from the
terminal labeled EG to the third leg of the power cord. The steel panel on the
bottom of the enclosure is also connected to earth ground for safety.
ADDITIONAL SURGE PROTECTION
It is recommended that additional surge protection be obtained for the power and
telephone lines, particularly if ISACC will be installed in a lightning-prone area.
Additional surge protection is available through Phonetics. Contact the Sales
Department for details.
BACKUP BATTERY
ISACC has three 6VDC rechargeable batteries wired in series. The total backup
battery voltage is 18VDC and offers a minimum of 3.5 hours and a maximum of
15 hours backup time. The actual battery performance is dependent upon what
external devices are wired to the 5V, 12V, 15V and 20V power supplies. If ISACC
is not powering any external devices, backup time will be 15 hours.
When the battery is configured for recharge, ISACC supplies a constant charge of
20.4 VDC when main power is present. To recharge the battery backup, go to the
SIP header at location P11 on the PC board. (P11 is located between the power
supply terminal block and the ON-OFF switch.) Using needlenose pliers, move
the shunt to the recharge position. See diagram below.
RECHARGE
NC
P11
Battery configured for recharge
NOTE: Have battery serviced by qualified service personnel only.