MAN-70007, Rev B, 02-20-2016
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16
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PowerMax Innovation Inc.
1243 Reamwood Ave.,
Sunnyvale, CA 94089
Tel.: 408-541-0888; Fax. 408-541-1886
4.6 PROTECTION CIRCUITS
The TWT Amplifier is designed with a variety of protection circuits to provide safeguards for the
amplifier should any adverse electrical conditions occur or if the amplifier is accidentally experiencing
operator deviation of the design application. Listed below are the safeguards.
4.6.1 Over Heat Protection
The TWT a critical component of this Amplifier is mounted to a heat sink which in turn, air cooled by
high efficiency blower. Should an overheating condition occur, either through component failure or by a
restricted air flow, the Amplifier contains heat sensors that will shut down the system should an
overheating condition occur. As a result, the air inlet and outlet openings should be free of obstructions
for proper cooling of the amplifier. Operation is restored by the Reset button when the amplifier cools to
normal temperature levels.
4.6.2 Power Supply Faults
The Power Supply Fault circuit monitors the Helix and Collectors power supplies and produces a fault
indication should any voltage level deviate from normal operating parameters. Each power supply
voltage output is monitored and displayed. Should any power supply voltage deviate from the design
parameters, the Fault Indication on the front panel Display of the Amplifier will display the related fault.
4.6.3 Mismatch Protection
The Amplifier is designed to operate with a tuned 50 Ohm load and should any mismatching of the 50
Ohm occur, the Reverse Power, also called Reflective Power, will increase producing a high VSWR. The
Amplifier microprocessor monitors the Reverse Power levels by utilizing a Dual Directional Coupler.
When the Reflected Power exceeds 25% the Amplifier Output Power it will go to STBY and the High
VSWR message will be indicate on the LCD display. The Reverse Power is also displayed on the LCD
Display for operator monitoring for any mismatched load.
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