Psu Can Bus Monitoring, Alarms, And Controls - Motorola MTS LiTE Installation, Configuration And Basic Service Manual

6802800U74-AN
Chapter 11: Power Supply Unit
There is an ON/OFF switch on the front panel of the PSU module which connects/disconnects DC
output voltages.
The PSU operates in the following modes:
• DC only operation at -48VDC (within -41VDC to -60VDC).
NOTICE: DC operation mode does not allow any battery controlling.
• AC only operation at 100/240VAC (within 90 VAC to 264 VAC;) without battery charging.
• AC operation (within 90 VAC to 264 VAC;) and automatic switch over to DC backup battery
operation when AC fails.
WARNING: Input Reverse Voltage Protection: The PSU is protected from damage due to a
reverse polarity input connection. If the input polarity is reversed, the DC In Status LED will be
solid red.
The MTS cabinet itself is wired to positive ground earth. The Power Supply Unit has a floating DC
ground concept.
For more information on PSU technical specifications, see
411.
11.1.1

PSU CAN Bus Monitoring, Alarms, and Controls

The PSU is monitored and controlled by the Site Controller. All monitoring outputs, alarm outputs, PSU
ID number and control inputs are available through a CAN Bus. It is also possible to update the PSU
firmware through the CAN Bus while the PSU is operational.
A unique identification of up to 4 PSUs is achieved by means of software. The assigned ID is used to
identify the PSU on the CAN Bus for commands and alarms. For more information on CAN Bus, see
Site Controller on page 294.
PSU monitoring parameters that can be measured through the CAN Bus:
• PSU temperature: -30 °C to +100 °C, tolerance: ±2 °C.
• Battery current: -20 A to +10 A, tolerance: ±1%.
• Battery voltage: 30 V to 60 V, tolerance: ±1%.
• Battery temperature: -30 °C to +100 °C, tolerance: ±2 °C.
• 7 V output voltage: 0 V to 10 V, tolerance: ±2%.
• 7 V output current: 0 A to 10 A, tolerance: ±2%.
• 28.5 V output voltage: 0 V to 30 V, tolerance: ±2%.
• 28.5 V output current: 0 A to 10 A, tolerance: ±2%.
• PSU output power: 0 W to 1100 W, tolerance: ±2%.
• Fan output voltage: 0 V to 30 V, tolerance: ±2%.
• PSU input air temp.: -30 °C to +100 °C, tolerance: ±2 °C.
PSU alarms available through CAN Bus:
• DC Source Fail: Indicating DC input voltage outside limits (below 43 V).
• DC Out Fail: DC output voltages out of limits.
• AC Source Fail: Early warning, indicating that the AC input is interrupted and the PSU starts to
operate from DC input source in 15 ms. (if a backup source is present).
• Software Fail: Indicating software is corrupted or unable to initialize.
330
Power Supply Unit Specifications on page