Chapter 12: Cooling Fans; Cooling Fans Overview; Cooling Fans Theory Of Operation; Figure 182: Mts Fan Kit - Motorola DIMETRA MTS 4 Installation, Configuration, And Service Manual

Applicant: Motorola Solutions
Chapter
12
Cooling Fans
One or more fan modules generate an airflow to manage the temperature within the MTS cabinets.

Cooling Fans Overview

Each fan module consists of two fans. A sensor monitors the fans revolution and in the event of failure, an alarm is
generated.
Note: Low power configurations of MTS LiTE and MTS 2 can optionally operate with cooling fans.

Figure 182: MTS Fan Kit

Cooling Fans Theory of Operation

The MTS card cage contains fan kits which reside below the modules. The PSU supplies and controls the three fan
kits speed (max two for MTS LiTE) to reduce the noise in normal temperature environments. The fan speed is based
on the temperature of the modules. The latter require that the Site Controller software monitors the module
temperatures and controls the fans speed through the CAN Bus.
MTS LiTE and MTS 2 offer configurations which do not need fans. The temperature range is from -30 °C to 55 °C. If
the temperature range is extended to 60 °C, two fan kits for MTS LiTE or three fan kits for MTS 2 need to be
Equipment Type: ABZ89FC5827 / 109AB-5827
6802800U74-AD | September 2014 |
305 | Cooling Fans
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Exhibit D2