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Section 4 - Initial Activation (ATSC Transmitters)
C – Variations in the network
Each piece of equipment has its own independent power supply, all of which have equal protection
features.
- Protection against short circuit
- Surge Protection
Basically, the surge protection on the network is performed by inserting the varistors between
phases and between phase and earth, thus absorbing peak voltage, not allowing them to damage
the power source. Protection against short-circuit is carried out by monitoring the current in the
output of the power source. If the current exceeds a pre-set reference value, it will understand
that the source output is shorted and should be disabled through the shutdown pin.
4.3.5 Transistor Temperature Setting.
The default temperature value of the transistor is 60 ° (140 ° F), factory set, the hottest transistor
will be the reference. The temperature can be set between 50 and 60 ° in Setup "PA Temperature
Control" menu (Setup Menu [1M00]). This setting can be changed according to ambient
temperature and transmitter efficiency. You can change this following procedure:
- With the transmitter in the operating power for at least 30 minutes, access the web page of the
transmitter or the USB interface of the power drawer and check the fans. Fan rotation should be
between 2000rpm and 7000rpm.
- After checking all fans of all drawers and if the highest rotation is below 5500rpm, the control
temperature can be reduced, it is advisable to reduce in steps of 2 degrees.
- Set the temperature of the transistor in the Setup Menu "PA Temperature Control", once you
have set the fan speed, you should wait a few minutes until the temperature of the transistor to
stabilize at the configured value, and then check the fan rotation again, the operating rotation will
be between 5500rpm and 6000rpm.
4.4
Automatic Power reduction Table
In case of any defect or failure to communicate in one or more Power Drawers, the equipment
will continue running, but on condition of power reduction. The reduction table of each equipment
of the E-Compact series is calculated according to the following formula:
In this condition, the equipment will operate with a power reduction alarm and with other alarms
that identifiy which of the drawers are not operating and the reason of it.
The EC701HP transmitter uses reduction table for modules. Below the formula for calculating
table:
*PAs - Power Amplifiers
Manual Rev. 0.1 - February 2018
4-11
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