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CABINET (Cabinet Sensors)
Issue 1 May 2002
8-383
555-233-143
CABINET (Cabinet Sensors)
NOTE:
The CABINET MO is valid only for multicarrier cabinets (MCCs). For
information about environmental maintenance on single-carrier cabinets
(SCCs), see
‘‘DC-POWER (Single-Carrier Cabinet Environment)’’
The cabinet sensors monitor cabinet temperature and fan rotation. Variable-
speed fans are used extensively in S8700 Multi-Connect systems.
The Maintenance circuit pack in an MCC EPN 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- or constant-speed fans.
■
Replace a fan assembly (carrier) only with a fan assembly of the same type
(new for new, old for old).
MO’s Name (in
Alarm Log)
Alarm Level
Initial Command to
Run
1
1.
UU is the universal cabinet number (1–64 for ATM PNC, 1–44 for CSS PNC).
Full Name of MO
CABINET
MAJOR
test environment UU
Cabinet Sensors
CABINET
MINOR
test environment UU
Cabinet Sensors
Summary of Contents for S8700 Series
Page 50: ...Maintenance Architecture 555 233 143 1 26 Issue 1 May 2002 ...
Page 74: ...Initialization and Recovery 555 233 143 3 12 Issue 1 May 2002 ...
Page 186: ...Alarms Errors and Troubleshooting 555 233 143 4 112 Issue 1 May 2002 ...
Page 232: ...Additional Maintenance Procedures 555 233 143 5 46 Issue 1 May 2002 ...
Page 635: ...status psa Issue 1 May 2002 7 379 555 233 143 status psa See status tti on page 7 406 ...
Page 722: ...Maintenance Commands 555 233 143 7 466 Issue 1 May 2002 ...