DigiTech C0408 AC Power Connection, System Grounding, Battery BACK-UP, = 1 + 0 N, Example

IMI 66-083 Instal’.

AC POWER CONNECTION

Employ a dedicated 117VAC 15 AMP circuit, with a third-wire ground, supplied to a standard electrical outlet (NEMA 515R) for the AC power connection. A C power connection is illustrated in Figure 3-2shown below.

•A plug-in power line surge protector should be installed between the power cord and the AC outlet.

•Do not connect the AC power cord until the installation has been checked.

•To apply AC power, connect the power cord to the electrical outlet.

BATTERY BACK-UP

The common equipment provides an interface connector for the connection of an optional external battery assembly. This assembly is available separately as a kit.

Be sure that the AC power cord Is connected to the electrical outlet before connecting the external battery assembly to the common equipment interface connector. This ensures that internal protection circuitry Is operating to prevent damage that could result from Improper connection.

•The optional Comdial model BBU02 external battery assembly provides a minimum of one hour of operation should the AC power to the system be interrupted. The BBU02 assembly has a 15

ampere-hour current rating.

The BBU02 external battery assembly may include batteries from either of the following suppliers:

-Model PS-12150 from Power-Sonic Corporation, Redwood City CA, 94032.

-Model PEl2V15 from GS PORTALAC, City Of Industry CA, 91748

The minimum battery backup time for a fully configured system can be calculated. The formula for doing this is:

T = 1 + [(0: (N)]

T= Back-up time in hours

K= Constant

0.9for CO408 with or without a CM408 module

0.8for CO816 with or without CM408 modules

0.8for Cl 632 with or without CM408 modules

e = Ampere-hour capacity of battery (BBU02 = 15)

N= total number of stations

Example:

Assume that a Cl 632 system plus two CM408 modules are installed along with a BBU02 battery assembly to provide back-up power.

(0.8) (15) 12

T = 1 + [(O.l) (48)] = 5.8 = 2’1 Ho”rs

•During AC operation, the common equipment provides re-charging current to maintain the voltage potential of the external battery assembly at an operational level. The charging circuit may not provide an adequate charge if an installed battery assembly has a current rating of greater than 40 ampere-hours.

NOTE: The optional BBUO2 external battery assembly requires approximarely 70 hours to completely re-charge to full potential after it has been completely discharged and, in some cases, when initially installed.

SYSTEM GROUNDING

The common equipment cabinet has internal secondary surge protection on all line ports. In order for this protection to be effective, the cabinet MUST be connected to a reliable earth ground such as a metal cold water pipe or a building frame ground. The grounding wire must be of #lO or #12 insulated, solid copper and separate from the three-wire AC line cord.

A ground stud is located on the common equipment cabinet for this purpose. System grounding is illustrated in Figure 3-2,

3-3