Motorola GTR 8000 Manual page 68

GTR 8000 Base Radio
The power supply, with front-to-rear airflow, operates from either an AC or DC input and provides the DC operating
voltage for the base radio. However the power supply prioritizes an AC source (if present) over that of a DC source.
If the power supply module is used for the Power Efficiency Package, the power supply must be used in
DC mode in order to obtain the 35 W standby power consumption performance.
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 reference to output ground, when operating from a DC source (43.2 VDC to 60VDC 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.
The battery charger is not usable when operating from a DC input power source.
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.
GTR 8000 Base Radio: 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.
GPW 8000 Receiver: 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.
2-8 6871022P86-A - November 2012