Acrodyne NW8201E DIGITAL TELEVISION BROADCAST TRANSMITTER User Manual 32 NV8202 26 04 06 01 00

Acrodyne Industries, Inc. DIGITAL TELEVISION BROADCAST TRANSMITTER 32 NV8202 26 04 06 01 00

Users Manual Part 9

Chapter 2 Design and Characteristics2099.9595.72 - 2.25 - E-21.9 Cooling systemFig. 30 Cooling system1) Air intake duct2) Fan3) Starting capacitor4) Differential pressure gage5) Temperature sensorThe cooling system with its two integrated fans (active standby) prevents the transmitterfrom overheating and contains the following components:Air intake/exhaust ductFans (2)Starting capacitor (2)Differential pressure gages (2)Temperature sensors (2)
Chapter 2 Design and Characteristics2099.9595.72 - 2.26 - E-21.9.1 Air Intake/Exhaust DuctFig. 31 Air intake duct (1) and exhaust duct (2)The air from the intake duct is drawn in by the fans and forwarded to the distribution shaft.The distribution shaft provides enough air to each amplifier to cool it. The heated air is rout-ed to an air collecting shaft on the opposite site of the amplifier and expelled via the exhaustduct.Note The intake/exhaust outputs are located either on the top or bottom of the rack, dependingon your order specifications.If the intake is at the bottom, there is no intake duct. The connecting flange is located di-rectly beneath the output box. In addition, the absorber unit is situated at the bottom and it feeds into the exhaust connec-tion.
Chapter 2 Design and Characteristics2099.9595.72 - 2.27 - E-21.9.2 FansFig. 32 FansA standard transmitter rack contains two fans, which adequately cool the transmitter withair. If one of the fans is defective, a warning is sent to the controller but the transmitter con-tinues to operate. If both fans fail, the rack controller switches off the affected rack. Thetransmitter indicates a cooling malfunction.
Chapter 2 Design and Characteristics2099.9595.72 - 2.28 - E-21.9.3 Starting CapacitorFig. 33 Starting capacitorEach motor is equipped with an external starting capacitor.
Chapter 2 Design and Characteristics2099.9595.72 - 2.29 - E-21.9.4 Differential Pressure GageFig. 34 Differential pressure gageThe differential pressure gages (diaphragm switches) measure the differential pressure ofeach fan between the fan flange (output) and the environment. Thus, fan malfunctions canbe selectively sent to the transmitter control unit.
Chapter 2 Design and Characteristics2099.9595.72 - 2.30 - E-21.9.5 Temperature SensorsFig. 35 Temperature sensorsThe temperature sensors measure the absolute intake and exhaust temperature in °C fordisplay on the NETCCU® and for monitoring in the rack controller.Note If the exhaust temperature is higher than 65 °C, the rack controller switches the rack off dueto the danger of overheating.
Chapter 2 Design and Characteristics2099.9595.72 - 2.31 - E-21.10 TransformerFig. 36 TransformerThe transformer converts the voltage in the event of local voltage differences, e.g. in theUnited States or Canada (AC power supply 115 V/200 V).Note For detailed information about the transformer, refer to the transformer manual.

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