Avaya S8700 - CABINET (Cabinet Sensors)

CABINET (Cabinet Sensors)
Issue 1 May 2002
8-383555-233-143
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