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Cooling Subsystem
5.1.1
Blowers
Each fan tray contains three blowers, one provided by Delta and two blowers provided by Comair,
for a total of nine blowers in an ZT 5085 system. Each blower has a two-phase, four-pole motor.
Table 10
Table 10. Delta* Blower Motor Specifications
Rated Voltage
Operation Voltage
Input Current
Input Power
Max Speed
Max. Air Flow
(at Zero Static Pressure)
Max. Air Pressure
(at Zero Air Flow)
Acoustical Noise (Avg.)
Life Expectancy
5.1.2
Control Board
The fan tray includes a control board for fan tray management. The control board provides the
following features:
•
Power sequencing
•
Over-current protection
•
Backfeed protection
•
Health LED control
•
FRU information
•
Temperature monitoring
•
Voltage monitoring
On insertion or initial power up, the fan control board stages power to the blowers. The first blower
is enabled immediately. The second blower is enabled about 300ms after the first, and the third
blower is enabled about 300ms after the second. Each blower is independently protected using a
self-resetting PTC.
The control board also includes logic to set the LED to the "unhealthy" state if any of the blowers
drop below approximately 1000 RPM, or if onboard voltage is invalid. The chassis management
module can also force the LED to the "unhealthy" state.
56
lists blower specifications.
Parameter
12 VDC
7.0 – 13.8 VDC
1.15 (max. 1.73) A
13.8 (max. 20.6) W
3100 rpm
1.12 (min. 1.00) m
39.55 (Min. 31.5) CFM
33.0 (min. 25.0) mmH
1.299 (min. 0.984) inchH
56.5 (max. 59.0) dB-A
70,000 hours continuous operation at 40°C with 15-65% RH
inrush limiting
/
Description
3
/min.
O
2
O
2
Technical Product Specification
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