Toshiba Strata AirLink DK40i, Руководство по установке и обслуживанию

Страница: 65 / 724

DK40i Configuration
Worksheet 2 – System Power Factor Check
Strata DK I&M 6/00
2-17
DK40i Conf
iguration
Worksheet 2 – System Power Factor Check
The DK power supply was engineered for maximum cost efficiency to provide power for the most
configurations. Because of this design, some power limitations exist when using old electronic-
type telephones, telephone option hardware, or newer PCBs, such as RWIU, TBSU, RBSU/RBSS.
Telephone/Device PFs
The power supply of each KSU supplies a limited amount of power. For each KSU, calculate the
total Telephone/Device Power Factor (PF) and add it to
Table 2-24 . (See Table 2-10 for PCB
quantity and type.)
The TBSU, RBSU/RBSS and RWIU PCBs require more power from +5VDC than other PCBs;
therefore, it is necessary to calculate the +5VDC and -24VDC PF on DK40i.
Important!
A system PF check must be performed for all configurations. See Table 2-19 for the
power 5VDC and -24VDC PFs for the DK40i system.
Note
AC current limitation by National Electric Code.
Important! The -24VDC system PF is Expansion KSU PCBs and all telephone/options
connected to the Base and Expansion KSUs. Base KSU option PCBs are already
covered for -24VDC PF.
Table 2-19 DK40i System Power Factor
Power Supply Max+5VDC PF Max -24VDC PF AC Input Current
TPSU16A 14 39 1.8A