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The system operates with 220 VAC and is equipped with two fuses:
If failure occurs, replace only with same type and rating of fuse.
Connecting System Back-up Battery
NX - 308 system will continue full operation during AC power failure (or "brown-outs") when a 24V
battery supply is connected.
To supply 24 volts, use two 12V batteries or four 6V batteries connected in series. Any battery used
must have a rating of not more than 40 AH and not less than 6 AH.
The required connector with red and black leads is supplied with the KSU:
Power supply circuitry will monitor and recharge batteries as required. A 10 AH battery will keep the
KSU and six keysets fully operational for approximately six hours.
Take extreme caution when connecting live batteries to avoid personal
Memory Protection
NX - 308 system is equipped with a memory back-up battery that prevents loss of the customer
database, stored in RAM, during a power failure. The 3.6 V DC Ni-Cd battery is connected through
switch J38 in the top righthand corner of the base board (Figure 4).
This memory back-up is turned off at the factory before shipping to preserve battery life.
Immediately after installation of the KSU, switch J38 to ON. Allow 48 hours of continuous operation
to fully charge Ni-Cd battery.
Installing Surge Protection Equipment
The system is equipped with adequate surge protection circuitry at telephone line interfaces and power
supply input interfaces.
However, for additional surge protection it is recommended that surge protection equipment is
installed.
Before Power On
22
AC Fuse
-
Battery Fuse
-
Red lead
Black lead
WARNING
injury or damage to the system.
1 AMP, 250 VAC. slow acting
3 AMP, 250 VAC, slow acting
=
Plus (+)
=
Minus (-)
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