Advanced Energy RFG 1251 User Manual page 32

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Advanced Energy
Table 4-5. Status Indicators
Power Limit This yellow LED indicates that the generator is unable to supply the
requested power level due to a limiting condition in the generator. Power
limits can be caused by load mismatches (high reflected power) or
excessive internal power dissipation limits. Power limits do not disable the
RF output of the generator.
Overtemp This yellow LED indicates that the generator has detected an
overtemperature condition and has inhibited its RF power. Cooling water
flow is enabled whenever this condition exists. After the overtemperature
condition is resolved, output power may be restored by cycling RF power
off and then back on again (the RF output will not be enabled until the next
off-to-on transition of the RF ON CMD signal on the User port). Once
activated, the LED remains lit until both the overtemperature condition
subsides and the RF ON CMD signal is de-activated.
Note: The RFG 1251 generator contains a high-temperature shutdown sensor which shuts off
all circuitry in the generator if the internal temperature exceeds a potentially damaging
level. This shutdown is designed to protect the generator in the event of extreme, out-of-
spec operating conditions. If such a shutdown occurs, all indicators on the unit are
extinguished. If the unit is allowed to cool down, the generator powers back on without
the need for operator intervention. The RF output is not enabled until the next off-to-on
transition of the RF ON CMD signal.
4-8 Connectors, Indicators, and Controls 5706058-A