RMC-ENV (Power/Fan Sensors)
Issue 1 May 2002
8-1013555-233-142
RMC-ENV (Power/Fan Sensors)
The AC Power Supply (650A) for a S8700 IP Connect rack-mounted cabinet
supports one alarm lead that indicates the state of both the power and fan. The
cabinets use variable-speed fans to reduce noise. The power unit contains
thermal speed control. A 3-pin connector on the variable-speed fan assembly
accepts variable input power to control its fan speed and power its alarm circuitry.
Table 8-432 shows the LED and alarm conditions.
Fan Removal and Replacement
!
WARNING:
You can remove the fan assembly while the system is running, but you must
replace the new assembly within 60 seconds to avoid a thermal overload.
1. Place the new fan assembly close to the RMC.
2. Loosen the thumb screws on the fan assembly, and pull it straight out
(unplug it) as shown in Figure 8-38. The power for the fan automatically
disconnects when the assembly is unplugged.
3. Plug in the new fan assembly. The power for the fan automatically
connects when the fan assembly is plugged in.
4. Tighten every thumb screw on the fan assembly.
MO’s Name (in
Alarm Log) Alarm Level Initial Command to Run Full Name of MO
RMC-ENV MAJOR test environment Power/Fan Sensors
Table 8-432. LED and Alarm Conditions
Condition LED Status Alarm State Fan/Power Alarm
Normal Red off,
amber on
Open Normal
No input power Red off,
amber off
Closed No input power
DC output not present
(except neon)
Red on,
amber off
Closed DC output not present
(except neon)
Fan alarm Red on,
amber on
Closed Fan/Power alarm
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