Worksheet 5 - System Power Factor Check - Toshiba Strata DK14 Installation And Maintenance Manual

DK424 Configuration
Worksheet 5 – System Power Factor Check
Worksheet 5 – System Power Factor Check
The Strata 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 and/or telephone option hardware.
For example, only 24 3000-series telephones can be installed in a cabinet. Each telephone and
PCB has a negative Power Factor (PF) and the RPSU424 or RPSU280 power supply have a
positive PF (+65). The sum of the telephones' PFs and PCBs connected to a signal cabinet must
not exceed –65. In the case of +5VDC, the power factor must not exceed 25.
The sum of the calculated cabinet PFs must not exceed the values provided on
4-23 shows the PF for PCBs and the RPSU280. PF numbers for telephones and devices are shown
on the following page.
Note The maximum number of RWIUs must not exceed one for the Base Cabinet and two for
the Expansion Cabinets.
Table 4-23 PCB and Power Supply Power Factors
PCB Type
IMDU
PCOU1, 2
PDKU1, 2
PEKU
PEPU
PESU
PIOU
PIOU2
PIOUS
Power Supply RPSU280
or RPSU424
R40S1A
RATU
RBSS1A
RBSS2A
RBSU + RBSS
RBSU1A
RBSU2A
RBUS1A
RBUU1A
RCIS1A
RCIU1A/2A
RCIU2
RCMS1A
RCOS1A/2A
RCOU (4 CO)
RCOU + RCOS (8 CO)
RCOU1A/2A
RCTUA
4-34
+5VDC -24VDC
0.1 0.16
1.9 2.0
0.8 0.3
1.6 0.7
1.1 6.5
1.5 0.5
2.0 6.5
1.1 6.5
0.75 4.0
25.0 65.0
0.0 2.8
1.7 0.3
0.6 0.3
0.0 0.3
3.1 0.3
2.5 1.0
0.0 1.0
0.0 0.3
0.0 1.0
0.3 0.1
0.7 0.2
0.2
0.6 0.3
1.7 2.0
2.5 2.0
3.6 4.0
1.9 2.0
2.0 1.0
Notes
With 8 DKTs.
With 8 EKTs.
With 4 EKTs and 4 SLTs.
Does not use +5VDC.
Does not use +5VDC.
Does not use +5VDC.
Does not use +5VDC.
Does not use +5VDC.
Page 4-38. Table
Strata DK I&M 5/99