ECRESO FM 100/300 W, user manual– 06/2015
Page 17
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Tel +33 (0)5 57 928 928 – Fax +33 (0)5 57 928 929 –
www.worldcastsystems.com – [email protected]
2.4.
Protecting the transmitter
To ensure the transmitter will work with no risk of damage, a series of protections has been set.
2.4.1.
Surge Protector
An optional surge protector module can be added to the chassis. The goal of this module is to limit the surge caused
by lightning. It works after the main protector usually located in the electrical board and before the power supply
protector, thus offering an optimal level of protection. The protector principle is to capture the surge and divert it to
the ground so as to protect the transmitter and its power supplies.
The surge protector used by WorldCast Systems includes multi-MOV technology and a gas discharge tube (GDT) giving
a very high protection and very low parasitic capacitance and leakage currents.
Please refer to Appendix B ‘Maintenance’ for the procedure to replace the surge protection module.
2.4.2.
Protection against VSWR
Several systems coexist to offer the optimal protection against VSWR:
Hardware protection:
In case of open circuit or short-circuit, the RF is cut. When the situation returns to normal, it is automatically
reset. The protection is triggered in case of an overshoot of the reflected power over:
Transmitter power
100 W
300 W
750 W
1000 W
1500 W
2000 W
Threshold
20 W
25 W
50 W
55 W
90 W
90 W
Software protection:
The software protection prevents the transmitter to reach a given reflected power value by blocking the
control or by lowering the power.
Transmitter power
100 W
300 W
750 W
1000 W
1500 W
2000 W
Threshold
15 W
20 W
40 W
45 W
80 W
80 W
Software settings for the reflected power security management: if the VSWR is greater than 3 in a recurring
way, enabling the VSWR Trip parameter allows disabling then cutting the RF (see VSWR Trip, section 5.3).
2.4.3.
Protection against high temperature
The Power Supply module includes its own protector against high temperature: the protector cuts off the power
supply output voltage if the temperature is abnormally high. When the situation returns to normal, it is automatically
reset. The temperature threshold value varies depending on the PSU.
The ambient temperature and the radiator temperature are monitored.
The max ambient temperature is set by software (see menu Temp/Fan, section 6.3.18 or serial command
CONF.AMB.MAX, section 7.2.4), default value is 50°C. In case of overshoot, a Warning alarm is triggered
(Alarm Amb).
The max radiator temperature is set by serial command (see serial command CONF.HEAT.MAX, section 7.2.4),
default value is 65°C for transmitters from 750 to 1000 W, 70°C for 1500 W transmitters and 80°C for 2000 W
transmitters. In case of overshoot, a Warning alarm is triggered (Alarm Heat).
The max internal temperature is set at 70°C for transmitters from 20 to 1000 W, 70°C for 1500 W transmitters
and 80°C for 2000 W transmitters. If the temperature exceeds 70°C, the RF is cut off and a fault alarm is
triggered (Alarm Temp).
