User's Manual

NTUM30DA Installation & Service Manual
4-7.1.2 Error Loop Cancellation Alarm (2
nd
Loop Alarm)
During normal operation, if the 2
nd
Loop is not locked for 30 seconds a Error Loop Cancellation
Alarm is declared. During power-up, the BTS waits for 30 seconds to allow the 2
nd
Loop to lock.
When the error amplifier is first turned on, the Error Loop Cancellation Alarm ON status is on until
the loops converge. The BTS allows 30 seconds for the alarm to clear after putting the amplifier
into Operational mode before reporting the alarm.
Detected loss of pilot signal with the error amplifier on, also leads to an Error Loop Cancellation
Alarm.
4-7.1.3 Gain Alarm
The gain alarm is caused by either of the following conditions:
• No output power with a nominal input power.
(P
in
> -3.8 dBm and P
out
< 25 dBm for five seconds.
• P
in
> +2.5 dB for five seconds.
4-7.1.4 Partial Failure of Main Amplifier Alarm (Transistor/Device Fail)
A sensor detects a main or error amplifier transistor failure. A transistor failure is detected as fol-
lows:
• When the main and error amplifiers are first turned on and converged, the Main VVA and Er-
ror VVA convergence points are compared to the Default Main VVA and Default Error VVA
values (with temperature compensation). If either of the VVAs is significantly lower than its
default value, the Partial Failure of Main Amplifier alarm is set.
• After the above test is performed, the Main VVA and Error VVA are continually monitored. If
the Main VVA or Error VVA significantly drop then the Partial Failure of Main Amplifier alarm
is set.
4-7.1.5 Over Temperature Warning Alarm
The MCPA will alarm if the temperature exceeds the normal operation temperature threshold
(90ºC internal temperature sensor) for five seconds. This threshold is a few degrees below the
Over Temperature Shutdown Alarm.
4-7.1.6 Power Supply Warning Alarm
The MCPA monitors the non-converter voltages, 15V, 5V and -5V power supply voltages and
alarms when of any of these DC voltages fail for at least five seconds. The normal operating
range for these voltages is: 15V +
1.5V, 5V + 0.5V and –5V + 0.5.
4-7.1.7 High DC Power Consumption Warning Alarm
If input DC power exceeds 375W in Mode 1 or 300W in Mode 2, for five seconds, the High DC
Power Consumption Warning Alarm is set.
 Copyright Powerwave Technologies, Inc., June 2003. All rights reserved
044-05141 Rev. A 4-4 June 2003