6
Chapter 4
Operating Instructions
General
The Model 8792 Termaline Load Resistors do not have any operating controls, therefore, operator’s do not need to
be present when in use. Proper operation of the equipment is assured if the instructions contained in
are followed exactly.
Do not apply more than the rated RF power to the load. The water flow rates 9 - 12 gpm (34 - 45.4 lpm) and inlet
water temperature, 5° C to 60° C (41° F to 140° F), must be maintained. In reality, an adequate and uninterrupted
water flow is more critical than the actual water temperature.
Normal Operation
Power On Procedure
1.
Turn on the AC power (if the load is equipped with an interlock system).
2.
Turn on the water supply (verify water flow rate is sufficient).
3.
Check for proper interlock operation (if the load is equipped with an interlock system).
4.
Check that all coaxial power line connections are properly tightened.
5.
Apply RF power to the load.
6.
Proceed according to instructions pertaining to the specific transmitting equipment.
Shutdown Procedure
1.
Turn off the RF Power to the load.
2.
Wait at least one minute to allow the resistor substrate time to cool.
3.
Turn the interlock and AC power off (if the load is equipped with an interlock system).
WARNING
Never attempt to disconnect RF equipment from the transmission line while RF power
is being applied. Leaking HF energy is a potential health hazard.
CAUTION
Do not apply more than rated RF power to the load. The water flow rate and inlet
temp. (5° C to 60° C) must be as specified:
Model
8792
Power
80 kW
5° C
9 gpm (34 lpm)
60° C
12 gpm (45.4 lpm)
Adequate and uninterrupted full water flow is more critical than temperature.
CAUTION
Verify cooling liquid is flowing through the load before RF power is applied and ensure
the cooling liquid supply is not interrupted while load is in operation. Even momentary
interruption of coolant supply while RF power is applied will cause almost immediate
burnout.
CAUTION
Never reverse the cooling water connections. It is very important for the safety of the
load resistor to observe proper flow direction. Also, when the load is first installed or is
reconnected, run the water for approximately one minute to fill the system and
remove all air pockets before applying RF power.
