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DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127
Issue 1
August 1997
Maintenance Object Repair Procedures
Page 10-209CABINET (Cabinet Sensors)
10
CABINET (Cabinet Sensors)
NOTE:
CABINET is valid only in a multicarrier cabinet system. For information
concerning single-carrier cabinet systems, refer to the DC-POWER
(Single-Carrier Cabinet Power) Maintenance documentation.
Each multicarrier cabinet is equipped either with six non-variable speed fans or
with six variable speed fans.
Non-Variable Speed (Standard) Fan Option. A non-variable speed (standard)
fan is indicated by one of the following Product Codes: "ED67077 G1," "ED67077
G2," or "ED67077 G3." Multicarrier cabinets with non-variable speed fans contain
a fan speed control unit known as the AHD1 circuit pack. This circuit pack is
designed to keep the temperature within the cabinet below 65
0
C (149
0
F). Air is
drawn in by the three fans located in the front of the cabinet. The air is channeled
upwards through a filter, then through carriers A, B, and C and out the top of the
cabinet. Air is drawn in by the three fans located in the back of the cabinet as
well. The air is channeled down through a filter, then through carriers D and E
and out the bottom of the cabinet. The AHD1 circuit pack monitors five of the six
temperature sensors located throughout the multicarrier cabinet, and it uses the
output of these sensors to adjust fan speed and to report air flow problems. The
Maintenance/Tape Processor in a Standard system PPN, the Duplication
Interface circuit pack, a PPN for a High or Critical Reliability system, and the EPN
Maintenance circuit pack in an EPN multicarrier cabinet system directly monitor
the sixth sensor (S1) to report temperature problems. The Cabinet Sensors
maintenance object represents the air flow and temperature problems reported
by the AHD1 circuit pack and by the Maintenance/Tape Processor, the
Duplication Interface circuit pack, or the EPN Maintenance circuit pack in the
multicarrier cabinet systems.
The fans and the AHD1 circuit pack obtain their power from the -48 volt DC
power supply of the 631 DB DC power unit in the A carrier. In a PPN cabinet for a
High or Critical Reliability system, the 631 DB DC power unit in the B carrier can
also provide power to the fans. The power goes from the power unit(s) to the
current limiter card (982LS), over a wiring harness from the A carrier to the back
of the fan unit, through the AHD1 circuit pack, and then to the fans. The front fans
1. Where P is an appropriate port network number determined via the Port field from the
Alarm or Error Log.
2. If a minor alarm occurs for a variable speed fan, the fan should be checked for a dirty
filter. If the filter is not dirty, the fan should be replaced.
MO Name (in
Alarm Log)
Alarm
Level
Initial Command to
Run
1
Full Name of MO
CABINET MAJOR test environment P Cabinet Sensors
CABINET MINOR
2
test environment P Cabinet Sensors