Model 250S1G6
2
Rev D
PS2 and PS3 are single output supplies which p24.5VDC to the RF final stages. Primary AC circuit
protection is provided by the circuit breaker in the Power Entry Module.
1.4 PROTECTION CIRCUITS
Features incorporated into this unit include RF output level protection circuits, thermal protection circuits, and
internal DC level sensing and monitoring circuits that sense the voltage on each of the final and driver
amplifier modules. There is protection for the AC main circuit. Both switching supplies are short circuit
protected. Reaching a threshold of either of the RF forward (incident) or reverse (reflected) power limit
adjustments, which are adjusted to approximately 450 watts and 200 watts respectively, will initiate limiting,
or smooth drive level fold-back, in a low-level stage of the amplifier chain. If the limiting circuits cannot
keep the amplifier’s levels below the limit threshold, the protection circuits will invoke a shutdown of the
main power supplies and low-level driver in the amplifier. Power amplifier modules are monitored for both
over-current and under-current. A
RESET
function is provided to permit re-powering of the amplifier in case
of transient or temporary activation of the amplifier’s protection circuitry. The low-level driver and output
amplifier subassemblies are thermally monitored.
The digital control panel monitors all fault signals, stores and displays any that are invoked and asserts the
required action.
1.5 INSTALLATION
Before proceeding, thoroughly inspect the amplifier for signs of physical damage that may have been incurred
during shipment and completely read the following installation and operating instructions, paying special
attention to all
CAUTION
notes.
1.5.1
Location
Select an operating location that will permit air to circulate freely around the amplifier’s cabinet. The
Model 250S1G6 utilizes air cooling and should be located where the normal flow of air into or exiting from
the unit will not be restricted, diverted, or re-circulated through the unit itself; in particular, the flow of warm
air exiting the rear of the amplifier should not be impeded.
Do not position the unit next to a wall or other equipment that would restrict the flow of air into the bottom of
the unit or out of the rear of the unit.
1.5.2
Power
The Model 250S1G6 is designed to operate using AC primary power of 200–250 Volts Alternating Current
(VAC), 50/60 Hz single phase, 2500 watts maximum. Power cord must be capable of 250VAC, 30 amps.
CAUTION:
Dangerous voltages are present in the Model 250S1G6 whenever the unit
is plugged into an AC outlet. Always disconnect the unit from the main
power line when servicing it. Please note that neither the Keylock Switch
nor the POWER switch will completely shut off the unit’s AC power.
