DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-361CABINET (Cabinet Sensors)
9
CABINET (Cabinet Sensors)
NOTE:
The CABINET maintenance object is valid only for multi-carrier cabinets.
For information about environmental maintenance on single-carrier
cabinets, refer to DC-POWER.
The cabinet sensors monitor cabinet temperature and fan rotation. Variable-
speed fans are used extensively in DEFINITY Systems.
The SYSAM circuit pack in the PPN cabinet and the EPN Maintenance circuit
pack in a multi-carrier EPN cabinet monitor a temperature sensor (S1) at the top
of the cabinet and generate a major alarm if the exit air temperature exceeds 65
degrees Celsius (149 degrees Fahrenheit). Another temperature sensor in the
top of the cabinet (S2) also monitors exit air temperature. If it exceeds 70
degrees Celsius (158
degrees Fahrenheit), the power distribution unit turns off all
cabinet power and invokes emergency transfer. Other sensors monitor fan
performance.
The repair procedures that follow rely on your ability to distinguish between high
and low fan speeds by the sound of the fans. Experience will allow you to
distinguish between the high and low pitches generated by high and low speeds.
A thermometer is also required for some of the procedures that follow.
In making replacements, observe the following rules:
■ New fan assemblies accept
only
variable-speed fans.
■ Old fan assemblies accept either variable-speed or nonvariable-speed
fans.
■ Replace a fan assembly (carrier)
only
with a fan assembly of the same
type (new for new, old for old).
Variable-Speed Fans
A variable-speed fan is identified by the following features:
■ A fan and air filter assembly with product code ED-67077-30, Group 4 or
greater, labeled on the front of the carrier
MO Name (in
Alarm Log) Alarm Level
Initial Command to
Run
1
1. UU is the universal cabinet number (1 for PPN, 2 -44 for EPNs).
Full Name of MO
CABINET MAJOR test environment UU Cabinet Sensors
CABINET MINOR test environment UU Cabinet Sensors
