Instruction manual

Strata DK40i
Power Considerations
Strata DK General Description 6/00 15
Power Considerations
The power supply generates +5VDC and -24VDC for the entire system, even in its expanded
configuration (see Table 8.) See Table 45 on Page 124 for environmental characteristics.).
Power Supply/Reserve Power
The power supply provides a built-in charger for the batteries (see Table 9). Two customer-
supplied 12VDC batteries can be connected to the power supply to maintain fully functioning
operation during a power failure.
Table 8 DK40i Electrical Characteristics
DK40i Primary Power
Input AC
AC frequency
Power
AC input current
115VAC
±10V
50/60 Hz
75 watts maximum
1.8A maximum
Power Supply
DC voltage output specification
-24VDC (-25.94~-28.66VDC)
+5VDC (+4.5~+5.5VDC)
-5VDC (-4.5~-5.5VDC) - Expansion KSU only
Battery Charger Characteristics
Charger
Nominal float voltage
Charge current
Battery discharge cut-off voltage
current limiting
2.275 volts/cell
0.7 amps maximum
20.5VDC
±0.5
Table 9 Typical Reserve Power Duration Estimates
Description
DK40i Base KSU DK40i Expansion KSU
No KSTU2 KSTU2 1 PCB 2 PCBs 3 PCBs 4 PCBs
Approximate (-24V) current drain (DC amps.) 1.0 1.2 1.6 2.0 2.4 2.8
Estimated battery operation time (in hours) 75.0 58.0 41.0 31.0 25.0 20.0
Reserve power time estimates assume the following:
• Batteries are fully charged at start of operation and two batteries are connected in a series (12 VDC, rated 80 amp/hours each).
• Batteries used for this test are gel-cell and maintenance free. Reserve duration will vary depending upon battery type, age, and
manufacturer. These figures should be used as an estimate.
• AC power must be available when first installing reserve power batteries.