#61186006L1-22A#
DESCRIPTION
The MX2820 23" Fan Module is a single 1U housing that incorporates a filter, circuit
boards, and fans to provide forced air ventilation for the 23" MX2820 Chassis and all
of its associated modules. It is installed below the MX2820 Shelf and is designed to
cool a single chassis. The MX2820 23" Fan Module:
■ Mounts directly below a 23" MX2820 Chassis (P/N 1186001L2) and provides
enough forced air ventilation to keep the internal shelf temperature no greater
than 20°C above the external ambient temperature.
■ Occupies one rack mounting space in a 23" rack and includes all the necessary
brackets and mounting hardware.
■ Accommodates two power inputs, ±24 V to –48 V (A and B) with one ±24 V or –48 V
return per input.
■ Should be powered from the rack fuse and alarm panel.
■ Reports alarms via the MX2820 SCU.
■ Provides front panel LEDs to indicate status of the fans.
■ Allows fan and filter replacement from the front without rewiring or removing the
assembly from the rack.
FRONT PANEL LEDS
Pwr/Sfan ● Green Power on
● Yellow One fan or power supply has failed
Mfan ●● Off (Multiple Fan) Power on, all fans OK
● Red Multiple fan failures
CONNECTIONS
The MX2820 Fan Module mounts directly under the MX2820 Chassis, P/N 1186001L2
in a 23" rack. It is powered from the rack fuse and alarm panel. The MX2820 Fan
Module Assembly consists of two main units, the fan module and the base assembly.
TURN-UP STEPS
To install the MX2820 23" Fan Module, perform the following steps:
After unpacking the MX2820 Fan Module, inspect it for damage. If damage is found,
file a claim with the carrier, and then contact ADTRAN Customer Service.
Mount the MX2820 Fan Module in the rack immediately below the MX2820 Chassis
with the screws provided.
Disconnect the power source and run power connections to the MX2820 Fan Module
for both A and B power feeds, and terminate them on the power lugs located on the
terminal block on the rear of the chassis. These connections can be made with up to
14 gauge wire and should be fused with 1.5 amp slowblo fuses for 48 VDC and 3 amp
for 24 VDC.
Run connecting wires from the FAN1 and FAN2 wire-wrap pins located near the
power connectors on the MX2820 Fan Module to the Aux3 wire-wrap pins on the right
rear of the MX2820 chassis to connect the fan alarms to the MX2820 SCM Module.
Restore power to the MX2820 Fan Module.
PROVISIONING
There are no provisioning steps other than installing the MX2820 Fan Module and
connecting the power and alarms.
MAINTENANCE
Replacement fans, P/N 1186008L1, are available and can be ordered separately. This
is a plug-in assembly and can be replaced without powering down the chassis.
Minimal routine maintenance of the MX2820 Fan Module is required. The filter
should be inspected for excessive dust at least every 90 days and replaced as needed.
Follow the steps below to replace the filter:
1. Loosen the two screws on either side of the front panel of the MX2820 Fan Module.
2. Carefully remove the front panel, taking care not to disturb the filter.
3. Remove the old filter carefully, taking care not to allow dust from the filter to enter
the system.
4. Install a new filter, P/N 1186009L1.
5. Replace the front panel.
6. Tighten the screws to secure the front panel to the MX2820 Fan Module.
OPERATIONAL SPECIFICATIONS
■ Operates from A or B ±24 V or –48 V input voltage power feeds.
■ For 48 VDC (nominal) use a 1.5 A fuse. For 24 VDC (nominal) use a 3 A fuse.
■ Operates over temperature range of (0°C to +50°C)
■ Storage –40°C to +70°C. Relative humidity to 95 percent, noncondensing.
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