User's Manual

NTUM30DA Installation & Service Manual
4-7.2 Major Alarms
When a major alarm condition occurs, the alarm is latched into a major alarm condition. The am-
plifier alarm state is read by the BTS the next time the amplifier is poled by the BTS. After the
alarm status is sent the major alarm register is not cleared. If the amplifier receives a “Enable
Command” or “Clear Alarms Command”, all major alarms will be cleared. If the amplifier is dis-
abled, all major alarms are also cleared.
Major alarms cause the amplifier to enter a STANDBY state, and the transceiver(s) associated
with the amplifier will be off-the-air. The error amplifier and main amplifier are turned off.
BTS MCPA
OPERATIONAL
Read Power and Status response - Alarm reported
Major Alarm condition
appears
Major Alarm condition
disappears
Read Power and Status command
Major Alarm condition
still exists
Read Power and Status command
Read Power and Status response - Alarm reported
Read Power and Status command
Read Power and Status response - Alarm reported
STANDBY
Figure 4-3 Major Alarm Reporting Sequence
4-7.2.1 Over Temperature Shutdown Alarm
The MCPA will alarm if the base plate temperature exceeds the temperature threshold at which
the MCPA can be damaged (95ºC) for five seconds. This condition does not auto-recover and will
require a reset command when the condition is corrected and the amplifier module has cooled
sufficiently.
4-7.2.2 Power Supply Shutdown Alarm
The MCPA monitors the converter power supply output voltages, 28V (23V in Mode 2) and 9V,
and sets the Power Supply Shutdown Alarm if a power supply converter fails for five seconds or
longer. The alarm is set under the following conditions and does not auto-recover:
• 28V > 30.8V or 28V < 24.8V in Mode 1 or 24V > 25.75V or 24V < 20.25V in Mode 2.
• 9V > 9.9V or 9V < 8.1V
 Copyright Powerwave Technologies, Inc., June 2003. All rights reserved
044-05141 Rev. A 4-5 June 2003