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Overview
Model 728 features include
an LED indicator, talk-battery-quality DC output, wide-input voltage
operating range, output short-circuit protection, and simple
installation. An LED is provided as an installation, operation, and
maintenance aid. This LED is referred to as the DC output LED. The DC
output is expressly designed for a wide range of general purpose and
telecommunications applications, including acting as a source of talk
battery. The output noise, especially over the voice band, was carefully
minimized. The wide input-voltage range, 110 to 240 V, allows operation
even when the power source deviates significantly from nominal 120 V.
The Model 728’s circuitry is designed for robust performance. The output
is short-circuit and over-current protected, automatically returning to
normal operation when the fault condition is removed. The unit is
completely self-contained in a compact wall-mounted cabinet. DC-output
interconnections are made using a 3-conductor removable screw terminal
strip. Input power is connected using a standard 3-conductor cord and
plug.
Model 728 Specifications
Input Voltage: 110-240 V, 47-63 Hz, single phase
Input Current: 2.6 A rms steady state, maximum
Power Cord: 3-conductor with plug, length 6 feet (2 meters),
nominal, not detachable
Output Voltage: 48.5 ±1 Vdc (with 100 mA minimum load)
Output Current: 3 A maximum, continuous
Output Current for Automatic Shutdown: 3.3 A, nominal
Minimum Load Current for Optimal Regulation: 100 mA
Load
Regulation: less than 1%, load current 100 mA to 3 A, input
voltage 110 to 240 V
Output Ripple Voltage: less than 10 mV rms, maximum
Output Compliance: complies with FCC Part 68 for talk battery
quality
Input-to-Output Efficiency: greater than 85% at full load
Output Connections: 3-position detachable screw terminal strip
Transient Protection: input and output protected against
transients
LED
Indicator: 1, indicates DC output
Operating Environment: –10 to 50 degrees C, humidity to 95% (no
condensation)
Radiated Noise Compliance: complies with FCC Part 15, subpart J,
class A for radiated and conducted emissions
Safety Compliance:
Underwriters Laboratories, Inc. CUL-60950 ITE LISTED
Dimensions:
4.7 inches high (11.9 cm)
7.4 inches wide (18.7 cm)
2.3 inches deep (5.8 cm)
Mounting: wall mounted only using two #8 pan head screws
Weight: 2.8 pounds (1.3 kg)
Specifications
subject to change without notice.
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