Psu Fan Control; Alarms And Controls Available Through Psu Can Bus Interface - Motorola MTS LiTE Installation, Configuration And Basic Service Manual

6802800U74-AN
Chapter 12: Cooling Fans
NOTICE: The Site Controller Application automatically detects if you use a fanless configuration
and causes the Base Radio Application to limit the power output.
The Test Application does not limit the power output automatically, so it is not recommended to
use the Test Application to run a station in the fanless configuration in a high power mode.
Testing the high power mode in the Test Application can be performed only by authorized
technical personnel.
12.2.1

PSU Fan Control

The Power Supply Unit (PSU) contains three fan supply outputs with LED indicators.
Three fan connector outputs supply three fan kits with two fans connected in parallel in each fan tray.
The FAN output specifications are:
• Output Voltage: from 12 to 24 VDC ± 5 %
• Output Current: 1 A for each fan connector output
The fans supply output voltage is linear dependent on the total power delivered by the PSU and the
ambient temperature. The fan supply starts with 24 V output for a few seconds.
For PSU LED indications, see
There are several MMI commands which control the fans:
•
psu <PSU number> get fan_voltage
•
psu <PSU number> set fan_speed
•
psu <PSU number> get fan_speed
•
psu <PSU number> set fan_config
•
psu <PSU number> get fan_config
•
psu <PSU number> start_fan
For description of the PSU fan commands, see the MTS Man Machine Interface Commands manual.
12.2.2

Alarms and Controls Available Through PSU CAN Bus Interface

The fan alarms available through the CAN Bus:
Fan 1 alarm
Fan 1 not operating, PSU received a High signal (open collector) from fan tray 1 through fan
connector 1.
Fan 2 alarm
Fan 2 not operating, PSU received a high signal (open collector) from fan tray 2 through fan
connector 2.
Fan 3 alarm
Fan 3 not operating, PSU received a high signal (open collector) from fan tray 3 through fan
connector 3.
The fans controls available through the CAN Bus:
No Fan 1
Prevents Fan 1 alarm (and associated LED) when no fan 1 is configured.
No Fan 2
Prevents Fan 2 alarm (and associated LED) when no fan 2 is configured.
340
PSU LED Indicators on page 333.