User's Manual

Mobile WiMAX Outdoor RAS SPI-2210 System Description/Ed.05

DACS Operation

If the temperature inside the outdoor SPI-2210 becomes the permissible level or less, the

DACS operates the damper of HDM as the closed loop mode to circulate the air inside the

system, and maintains the appropriate temperature inside the system by using the

generation of heat of the system or the heater.

To the contrary, if the temperature inside the outdoor SPI-2210 becomes the permissible

level or more, the DACS operates the damper of HDM as the open loop mode. The open

loop mode enables the cool air outside the system to flow into the inside of the system and

cool the module inside the system, and it also enables the hot air inside the system to be

released out of the system and cool the system.

Fan Operation

If the temperature inside the outdoor SPI-2210 is low, FAN-POD and FAN-POR operate at

low speed by the control of UCM. To the contrary, if the temperature inside the outdoor

SPI-2210 is high, FAN-POD and FAN-POR operate at high speed by the control of UCM.

Figure 3.7 Heat Radiation Structure of the Outdoor SPI-2210

Cool Air Intake

MCU

Air Baffle

MRU

FAN

AICU

Air Baffle

DMB

FAN

Damper Open

Heater Off

Damper Open

Heater Off

Membrane Filter Membrane Filter

Auxiliary Device