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4

5

6

8.

With a 14-gauge wire-stripping tool, strip the three wires in the tray cable coming from 
the DC input power source to 8 millimeters ± 1 millimeters (0.31 inches ± 0.039 
inches), as shown below. 

9.

Connect the frame ground wire to the terminal marked with the ground symbol by 
inserting the wire into the terminal block and tightening the connection with a flathead 
screwdriver, as shown below. .

10. Connect the positive feed wire to the terminal block marked 

+

 (

positive

).

11. Connect the negative feed wire to the terminal block marked

 - 

(

negative

). 

12. Secure the tray cable near the rack framework using multiple cable ties (not 

provided) to minimize the chance of the connections being disturbed by casual 
contact with the wiring. Allied Telesis recommends that you use at least four cable 
ties 10 centimeters (4 inches) apart with the first one located within 15 centimeters (6 
inches) of the terminal block. 

13. Ensure that the circuit breaker is in the Off position.
14. Connect the DC wires to the circuit breaker.
15. Power on the circuit breaker.
16. Verify that the Power LED is green. If it is not, refer to “Testing and Troubleshooting 

the Installation.”

Hot Swapping an 

AT-PWR9 Power Supply

This section describes how to replace a failed AT-PWR9 Power Supply in an AT-MCR12 
chassis.

Note

Hot swapping requires that the main and auxiliary power supplies be connected to 
separate DC circuits.

1.

Power off the appropriate DC circuit to the failed power supply.

2.

Remove the positive and negative feed wires from the terminal block by loosening 
the screws to the wire connections with a flathead screwdriver.

3.

Remove the frame ground wire from the terminal block by loosening the screw to the 
wire connection with a flathead screwdriver.

4.

Loosen the captive screws on the failed power supply and slide it out of the chassis.

5.

Slide a new power supply into the slot.

6.

Refer to “Installing an AT-PWR9 Power Supply as an Auxiliary Power Supply” for 
information about installing and wiring the replacement power supply.

Testing and Troubleshooting the Installation

Follow the guidelines in this section for testing and troubleshooting the installation in the 
event that a problem occurs.
1.

Verify that the Power, PWR A and PWR B LEDs are green. If one of the LEDs is 
OFF, do the following: 

Check to be sure that the power supply is securely connected to the power outlet.
Check to be sure that the power supply is securely seated in the chassis.
Check to be sure that the wires are connected to the correct terminals.
Check to be sure that the DC power circuit is powered ON.

2.

Check to be sure that the fans for both power supplies are operating. If a fan is not 
operating, it is likely that the power supply has failed.

If you still have problems after testing and troubleshooting the installation, contact Allied 
Telesis Technical Support at 

www.alliedtelesis.com

 for assistance. 

Warranty Registration

Allied Telesis hardware products are covered under limited warranties. Some products 
have a longer warranty coverage than others.
This AT-PWR9 power supply has a limited warranty of 5 years. 
All Allied Telesis warranties are subject to the terms and conditions set out on the Allied 
Telesis website at 

www.alliedtelesis.com/warranty

Specifications

Physical Characteristics

Dimensions (H x W x L)

225 mm x 61 mm x 120 mm
(8.9 in x 2.4 in x 4.7 in)

Weight

.75 kg (1.65 lbs)

Operating Temperature

0° C to 40° C (32° F to 104° F)

Storage Temperature

-25° C to 70° C (-13° F to 158° F) 

Operating Relative Humidity

5% to 90% RH (non-condensing)

Storage Relative Humidity

5% to 95% RH (non-condensing)

Power Requirements

Input Supply Voltage

36 to 72 V DC

Maximum Inrush Current

10 A maximum

Maximum Current

4 A at 48 V DC

Agency Certifications

Electrical Safety

UL60950-1 (

c

UL

us

), EN60950-1 (TUV), 

CSA 950

Immunity

EN50082-1

Emission

EN55022-1 Class A

Electrical, Safety, and Emissions Statements

This product meets the following standards.

Copyright © 2007 Allied Telesis, Inc. All rights reserved. No part of this publication may 
be reproduced without prior written permission from Allied Telesis, Inc. 

Warning:

 Do not strip more than the recommended amount of wire. Stripping 

more than the recommended amount can create a safety hazard by leaving 
exposed wire on the terminal block after installation. 

 E10

Warning:

 When installing this equipment, always ensure that the frame ground 

connection is installed first and disconnected last. 

 E11

Warning:

 Check to see if there are any exposed copper strands coming from the 

installed wire. When this installation is done correctly there should be no exposed 
copper wire strands extending from the terminal block. Any exposed wiring can 
conduct harmful levels of electricity to persons touching the wires. 

 E12

8mm ±1mm

(0.31in. ±0.039in.)

Warning:

 When installing this equipment, always ensure that the frame ground 

connection is installed first and disconnected last. 

 E11

U.S. Federal Communications Commission

Radiated Energy

Note: This equipment has been tested and found to comply with the limits for a Class A digital device 

pursuant to Part 15 of FCC Rules. These limits are designed to provide reasonable protection 

against harmful interference when the equipment is operated in a commercial environment. This 

equipment generates, uses, and can radiate radio frequency energy and, if not installed and used 

in accordance with this instruction manual, may cause harmful interference to radio 

communications. Operation of this equipment in a residential area is likely to cause harmful 

interference in which case the user will be required to correct the interference at his own expense.

Note: Modifications or changes not expressly approved of by the manufacturer or the FCC, can void 

your right to operate this equipment.

Industry Canada

This Class A digital apparatus meets all requirements of the Canadian Interference-Causing 

Equipment Regulations.

Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel 

brouilleur du Canada.

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