Power Considerations; Reserve Power - Toshiba DK14 Installation And Maintenance Manual

DK424i Installation

Power Considerations

Power Considerations
Each DK424i Base and Expansion Cabinet houses a power supply that furnishes power to all of
the stations and some of the peripherals that interface with the cabinet (see
Table 7-1 DK424i Electrical Characteristics
DK424i Primary AC Power Voltage
Input AC
AC Frequency
Watts per cabinet (continuous)
Watts for five cabinet system
DK424i Primary Power Current Consumption (Rating in Amperes)
1 cabinet
2 cabinets
3 cabinets
4 cabinets
5 cabinets
Power Supply Unit (BPSU672)
DC voltage output specification

Reserve Power

Two or four customer-supplied 12VDC reserve batteries can be connected to the system to
maintain normal operation during a power failure (see
in a highly-charged state by the standard power supply and must be connected when the system is
operating normally. Fully charged batteries must be connected when normal AC power is
available, batteries cannot be connected after/during an actual power failure.
Table 7-2 Reserve Power Characteristics
Battery Charger Characteristics
Charger: current limiting
Nominal float voltage: 2.275 volts/cell
Charge current: 0.7 amps maximum
Battery discharge cut-off voltage: 20.5
Table 7-3 Typical Reserve Power Duration Estimates (in hours)
Number of Cabinets
Estimated operation time Two-battery
configuration
Estimated operation time Four-battery
configuration
Typical battery Current Drain (-24VDC)
Underwriters' Laboratory (UL) and local electrical codes require certain standards for connecting
commercial AC and reserve power to the Strata DK424i system.
assemblies may be required to meet UL and local electrical code standards.
7-4
±
115 10VAC or 208
50/60 Hz, Single-phase
180
900
120VAC
3.2 amps
6.4 amps
9.6 amps
12.8 amps
16.0 amps
-24VDC (-26.3~-27.8VDC, 6.0 DC amps )
+5VDC (+4.5~5.5VDC, 4.0 DC amps)
-5VDC (-4.5~-5.5VDC, 0.8 DC amps)
±
0.5VDC
1 2
12.0hr 6.0hr
24.0hr 12.0hr
4.6amps 8.7amps
Table
± ±
20VAC or 240 20VAC
208VAC
2.2 amps
4.4 amps
6.6 amps
8.8 amps
11.0 amps
Tables 7-2 and 7-3). The batteries are kept
Maximum Battery Charger Drain:
-24VDC
1 cabinet 6.0 amps
2 cabinets 12.0 amps
3 cabinets 18.0 amps
4 cabinets 24.0 amps
5 cabinets 30.0 amps
3 4
4.0hr 3.0hr
8.0hr 6.0hr
12.8amps 16.9amps
Table 7-4 describes which
7-1).
240VAC
2.0 amps
4.0 amps
6.0 amps
8.0 amps
10.0 amps
5
2.5hr
5.0hr
21.0amps
Strata DK I&M 5/00