© 2001 – Ericsson Amplifier Technologies Inc.
12
Table 3.
MCPA Local Controls and Indicators
CONTROL/INDICATOR
FUNCTION
DC ON
-
Power Supply switch and integral DC ON green LED indicator, enables
the external high power +27V power supply circuitry.
ENABLE ON
-
Green LED indicates unit is ENABLED, biased on and the amplifier is
ready to amplify signals.
FAN ALARM
-
Yellow LED indicating a blocked or non-functioning fan.
LOOP ALARM
(Steady On)-
Steady (not blinking) Red LED indicating internal control loops can no
longer minimize IMD performance. The sequence of disable and
enable commands may be used to reset the loops to their normal
conditions.
LOOP ALARM
–
(Blinking On/Off, indicates
Locking Mode)
Blinking red LED indicating
Locking Mode
has been entered. The
locking mode is used to indicate when the module is unable to
minimize IMD performance and is attempting to adjust loop
coefficients. During this mode, IMD performance may not meet
specified values. The module will attempt to improve performance for
1 minute. If unable to improve performance during this period, the
module will indicate a loop alarm and enter the shutdown mode, and
will require power to be reset in order to clear the fault.
VSWR ALARM
-
Red LED indicating load VSWR is greater than 3.0:1. Amplifier will
enter shutdown mode, and will require power to be reset in order to
clear the fault.
POWER SUPPLY ALARM
-
Red LED indicating a power supply generated voltage is out of range.
Amplifier will enter shutdown mode, and will require power to be reset
in order to clear the fault.
TEMP WARNING/ALARM
-
Dual color (Yellow/Red) LED.
TEMP WARNING
: Yellow color indicates approach of excessive
operating temperature of approxi80
°
C as monitored on the
heatsink. Operation of the MCPA can continue uninterrupted during
this warning condition.
TEMP ALARM
: Red color indicates excessive operating temperature
of approxi90
°
C as monitored on the heatsink. Operation of
the MCPA is disabled until the heatsink has cooled to a safe operating
temperature, at which point, operation will automatically resume.
OVERPOWER ALARM
-
Red LED indicating that the RF output power from the MCPA is greater
than 2 dB above nominal output power. Amplifier will enter shutdown
mode, and will require power to be reset in order to clear the fault.
NOTE
Activation of the
LOOP ALARM, VSWR ALARM, POWER SUPPLY
ALARM, TEMP ALARM
or
OVERPOWER ALARM
will cause the
Amplifier to enter shutdown mode. The amplifier will attempt to auto
recover up to three times within 24 hours. If the alarm is still present,
the amplifier will continue to shutdown. The amplifier may also be
manually reset using the front panel button. Refer to Figure 4, which
details the ON/OFF sequence of the MCPA.
