User's Manual

When operating from an AC source (90 to 264 VAC, 47-63 Hz), the supply generates two DC output voltages of 29 V
with respect to output ground. The power supply automatically adjusts to AC input ranges and supplies a steady
output.
In AC mode, the power supply provides a separate battery charger which can be used to maintain the charge on a 48
VDC nominal system, positive or negative ground, if installed. The supply generates two DC output voltages of 29 V
with respect to output ground, when operating from a DC source (43.2 VDC to 60 VDC maximum), positive or
negative ground. This voltage limit includes consideration of the battery charging "float voltage" associated with the
intended supply system, regardless of the marked power rating of the equipment. Whether in AC, Battery Revert, or
DC Only mode, at a voltage of 42 V or lower, the power supply shuts down to not damage any connected battery
bank. Once this condition occurs, the power supply starts only after the applied voltage exceeds 45 V.
The battery charger is not usable when operating from a DC input power source. This DC source must be located in
the same building as the base radio, and it must meet the requirements of a SELV circuit.
The power supply contains several switching-type power supply circuits as follows:
• Power factor correction circuitry
• Battery charging circuitry
• Diagnostics and monitoring circuitry
The power supply controls its own continuously running fan, changing its speed to fast, or slow as needed.
Note:
If the power supply module is used for the Power Efficiency Package, the power supply fan does not run
below a 40 °C air inlet temperature in DC mode with the transmitter in a de-keyed state.
GTR 8000 Base Radio Theory of Operation | 69
6871024P71-A | November 2013 | Send Feedback
Applicant: Motorola Solutions
Equipment Type: ABZ89FC5810B / 109AB-5810B
Exhibit D (Permissive Change)