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AMX reserves the right to alter specifications without notice at any time.
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The NXA-PDU-1508-8 can be mounted in a standard 19-inch equipment rack:
1. Attach the brackets to the PDU using the bracket screws provided in the Bracket
Mounting Kit (FIG. 4).
2. Mount the PDU in the rack, using 4 rack-mounting screws (not provided, see FIG. 5).
Front Panel Components
The front panel components of the NXA-PDU-1508-8 (see FIG. 1) are described below. See
the Specifications table for descriptions of the LEDs on the front panel.
RESET Pushbutton
The RESET pushbutton serves as a momentary reset switch for the MASTER AxLink power
connection, as well as a reset switch for the PDU itself:
• Press/hold for 3 seconds: Resets the MASTER AxLink power connection
(minimum 0.5 second toggle).
Note: A master powered externally from the PDU will not be reset by the RESET
pushbutton.
• Press/hold for 17 seconds: Resets the PDU (similar to a full power-cycle of the unit).
Rear Panel Components
The rear panel components of the NXA-PDU-1508-8 (see FIG. 1) are described below:
AXLINK POWER Connectors 1-8
The eight AxLink connectors (labelled “AXLINK POWER”) are standard 4-pin AxLink captive-
wire connectors that provide data and power for up to 8 AxLink connections.
The AxLink device connectors are separated into two Banks:
• BANK 1 (top) includes AxLink connectors 1-4, numbered from right-to-left (see FIG. 1)
• BANK 2 (bottom) contains AxLink connectors 5-8, numbered from right-to-left (see
FIG. 1)
The PDU provides switched power to banks 1 and 2.
Note: The AxLink bus strip does not provide switching on AxLink data lines.
MASTER Connector
The 3.5mm 4-pin captive-wire AxLink connector labelled “MASTER” provides AxLink
connectivity between the PDU and the NetLinx Master (see FIG. 1).
Note: This connector is always ON.
TEMP Connector
The 3.5mm 2-pin captive-wire connector labelled “TEMP” (see FIG. 1) provides the option to
connect a Remote Temperature Sensor (RTS). The NXA-PDU-1508-8 comes with one
ENV-VST-TSO Temperature Sensor (FG2050-22).
Connect either wire from the RTS to either pin on the TEMP connector (FIG. 6).
Note: The NXA-PDU-1508-8 is also compatible with the ENV-VST-TSF Indoor Flush Mount
Temperature Sensor (FG2050-21 - not included).
Preparing Captive Wires
1. Strip 0.25 inch (6.35 mm) of wire insulation off all wires.
2. Insert each wire into the appropriate opening on the connector according to the wiring
diagrams and connector types described in this section.
3. Turn the flat-head screws clockwise to secure the wires in the connector.
Note: Do not over-torque the screws; doing so can bend the seating pins and damage the
connector.
AxLink Data and Power Connections
Connect the AxLink device’s AxLink connector to one of the AxLink connectors (1-8) on the
rear panel of the PDU for data and 12 VDC power as shown in FIG. 7.
Note: If the PDU is connected to a NetLinx Master that is self-powered (powered by a stand-
alone power supply other than the PDU, or the DVX-2100HD which features an internal
power supply), do not use the AxLink Power connection between the PDU and the NetLinx
Master.
AxLink Wiring Guidelines
AxLink devices require 12 VDC power to operate properly. The necessary power is supplied
via the AxLink cable. The maximum AxLink wiring distance is determined by power
consumption, supplied voltage, and the wire gauge used for the cable.
Use the 3-step formula below to calculate the maximum wiring lengths allowable between
the PDU and connected AxLink devices.
1. <Total current consumption of all connected AxLink devices> x <Resistance/Foot> x 2 =
<voltage drop per foot>(see table below for Resistance/Foot values.)
2. <Power supply voltage> - 12 VDC = <surplus voltage dissipation for cable run>.
3. <surplus voltage dissipation for cable run>/<voltage drop per foot>=Max. distance.
The following table lists the resistance factors used in the formula.
CONFIG DIP Switch
The NXA-PDU-1508-8 uses an 8-position DIP Switch (labelled “CONFIG”) to specify a
unique device address for itself in a NetLinx Control System (FIG. 8).
Setting the Device Address of the PDU
The NXA-PDU-1508-8 firmware implements 8 AxLink device IDs, starting from the device ID
denoted by the DIP switch. The device IDs used by the NXA-PDU-1508-8 are as follows:
•Dev 1: (Power Outlet 1) + (AxLink-Bank 1 Power) + (Input Voltage) + (Temp)
•Dev 2: (Power Outlet 2) + (AxLink-Bank 2 Power)
•Dev 3-8: (Power Outlets 3-8)
Note: AxLink devices IDs are always in the range of 1-255. However, the PDU requires
seven open device numbers above the PDU device number setting to accommodate its
sub-devices. Therefore, device addresses 249-255 are not valid for the PDU.
To set the Device Address:
1. If connected, disconnect the power supply.
2. Set the CONFIG DIP switch according to the values shown below:
The device number is set by the total value of DIP switch positions that are in the ON
position. Note that the ON position is indicated on the DIP Switch.
If you later change the device number, remove and reconnect the power connector to enter
the new device number into memory.
Note: Use the "Dip Switch2" software application to calculate dip switch position values
(available to download from www.amx.com).
Power Outlets 1-8
The eight 110-220VAC 50/60Hz, IEC C-13, 15A AC Power Outlet Connectors provide AC
power to connected devices (see FIG. 1).
Note: Maximum load on a single outlet = 10A @ 110-120 VAC / 8A @ 220-240VAC.
Power Inlet
The IEC C-14, 15A power inlet connector provides 110-220VAC, 50/60Hz mains power to the
PDU.
Powering Up The NXA-PDU-1508-8
When power is applied to the PDU for the first time, the outlets are powered in sequence
(1-8), with a delay of 0.5 second between outlets.
By default, the state of all outlets upon initial power-up is ON.
Initial Response Time
Allow the PDU approximately ten seconds after it appears online to register internal
processes before attempting to turn on a channel.
Persistence of On/Off States for All Outlets
By default, Persistence for all outlets is set to ON.
Persistence can be turned off via the PERSIST Send_Command (see the NXA-PDU-1508-8
Operation/Reference Guide for programming information).
For subsequent power-ups (from a power off state or on system reset), the PDU will restore
the last recorded state of any outlet in a sequenced fashion, starting from outlet 1 in
numerical order, with a delay of 0.5 second between energizing any two outlets, assuming
the default Persistence setting of ON has not been changed.
NetLinx Programming
The NXA-PDU-1508-8 is controlled via NetLinx Programming, primarily through the use of
Channels and Levels. Refer to the NXA-PDU-1508-8 Operation/Reference Guide for
programming information.
Additional Documentation
Refer to the NXA-PDU-1508-8 Operation/Reference Guide for programming information and
instructions on upgrading Firmware on the PDU.
FIG. 4 Attaching the Brackets
FIG. 5 Installing the PDU in a Rack
FIG. 6 TEMP Connector
FIG. 7 AxLink straight-thru wiring
Mounting bracket
PDU Bracket screws
Mounting bracket on PDU
Rail on equipment rack
NXA-PDU-1508-8
RTS
ENV-VST-TSO
(remote temperature sensor)
PWR
AXP
AXM
GND
AxLink DeviceNXA-PDU-1508-8
PWR
AXP
AXM
GND
(see note below)
Cable Gauge/Resistance Factors
Solid Copper Wiring Stranded Copper Wiring
Wire gauge Resistance/Foot Resistance/Foot
18 AWG .00639 .00692
20 AWG .0101 .01090
22 AWG .0162 .01690
24 AWG .0257 .02770
FIG. 8 CONFIG DIP Switch
Switch 1 2 3 4 5 6 7 8
Value 1248 16 32 64 128
