Worksheet 2 - System Power Factor Check; Telephone/Device Pfs - Toshiba DK14 Installation And Maintenance Manual

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
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.
A system PF check must be performed for all configurations. See
Important!
power supply +5VDC and -24VDC PFs for the DK40i system.
Table 2-19 DK40i System Power Factor
Power Supply
TPSU16A
AC current limitation by National Electric Code.
Note
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.
Strata DK I&M 5/00
Max+5VDC PF Max -24VDC PF
14 39
Worksheet 2 – System Power Factor Check
Table 2-24. (See Table 2-10
Table 2-19
AC Input Current
1.8A
DK40i Configuration
for PCB
for the
2-17