ADLINK PXIS-3320 PXI chassis installation troubleshooting



ADLINK PXIS-3320 15 Slot 6U PXI Chassis Deployment and Troubleshooting Guide

In the fields of high-end testing and measurement, semiconductor automation, military electronics, and scientific research experiments, the PXI platform has become the preferred architecture for system integration due to its modularity, high bandwidth, and precise synchronization capabilities. ADLINK PXIS-3320 is a 19 inch 6U PXI/CompactPCI chassis, providing 1 system slot and 14 peripheral slots, supporting high power density configurations, equipped with hot swappable redundant power supplies and powerful cooling systems. This article will provide engineers with a complete engineering deployment manual from the aspects of backplane architecture, power budget, system monitoring, hardware installation, common troubleshooting, and preventive maintenance.

Product positioning and selection comparison

The PXIS-3320 series is divided into two models:

PXIS-3320: Standard Edition, equipped with 2 hot swappable cPS-H325/AC power modules, with a total output power of 500W (250W per module), suitable for most conventional PXI testing systems.

PXIS-3320/1000W: High power version, equipped with 4 identical power modules, with a total output power of 1000W, designed for power intensive peripherals such as high-speed digitizers (high sampling rate ADCs), arbitrary waveform generators, high-power digital I/O drivers, RF communication modules, etc.

Both models comply with PXI Rev. 2.2 and CompactPCI (PICMG 2.0) specifications, support 6U cards (also compatible with 3U modules through adapter boards), have physical dimensions of 484mm x 295mm x 398mm (length x width x height, excluding handles), weigh approximately 23kg, and can be installed in a rack or placed on a desktop.

Selection suggestion: If the total power consumption of modules in the system (+5V,+3.3V,+12V, -12V) is less than 450W, the standard version is sufficient; If the estimated power exceeds 500W or N+1 redundancy is required (4 power supplies support 3+1 backup), the 1000W version must be selected. Recommend pairing with ADLINK cPCI-6840 or cPCI-6860A high-performance system controllers, or implementing remote host expansion through PCI-8570/PXI-8570 remote control modules.

Backplane architecture and synchronization characteristics

The PXIS-3320 backplane model CBX-6015 adopts a height of 6U and is physically arranged with 15 slots (the system slot is located at the leftmost end, i.e. Slot 1).

2.1 System Slot (Slot 1)

Occupying 2 slot widths, it can install 1 or 2 slot 6U PXI/cPCI controllers. This slot provides standard PCI bus signals (32/64 bits, 33/66MHz) and implements PCI communication through the P1 connector, while the P2 connector provides PXI specific signals (trigger, clock, local bus, etc.).

2.2 Star trigger slot (Slot 2)

Slot 2 is a star shaped trigger main slot, which sends trigger signals to Slot 3~Slot 15 through dedicated point-to-point connections (PXI_STAR0~PXI_STAR12) on the backplane. The channel skew is less than 1ns, making it suitable for multi module systems that require precise synchronization (such as multi-channel synchronous sampling). To use star trigger, a dedicated star trigger controller module must be installed in this slot.

2.3 Peripheral Slot (Slot 3~Slot 15)

There are a total of 14 peripheral slots that can accommodate standard 6U PXI or CompactPCI modules. Each peripheral slot is equipped with:

PXI trigger bus (8-wire): shared among all slots, used for transmitting trigger signals or clocks between modules to achieve timing coordination.

PXI local bus (14 lines): connects adjacent slots (left and right) to form a daisy chain, used for high-speed auxiliary communication or analog signal transmission, without occupying PCI bandwidth. Note that the local bus is disconnected between Slot 1 and Slot 2, in accordance with PXI specifications.

10MHz reference clock (PXI_CLK10): allocated from the system slot to all peripheral slots, independently buffered, with inter slot skew<1ns, supporting external clock input (injected through the P2 pin of Slot 2).

2.4 Multi segment PCI bus structure

In order to support 15 slots, the backplane divides the PCI bus into three independent segments (via bridge chips):

Bus # 1: Slot 1 (system)+Slot 2~Slot 6 (a total of 6 slots)

Bus # 2: Slot 7~Slot 12 (6 slots)

Bus # 3: Slot 13~Slot 15 (3 slots)

Each segment has independent IDSEL, REQ/GNT, and clock allocation, effectively reducing bus load and ensuring signal integrity. Interrupt Routing (INTA~INTD) is allocated according to rotation priority, as detailed in the manual table "Bus Segments and Interrupt Routing".

Detailed explanation of power system and power budget

3.1 Power module specifications

Each cPS-H325/AC power module is a PICMG 2.11 compatible 3U CompactPCI module, supporting 100~240VAC wide voltage input (47~63Hz), with the following single module output capabilities:

Typical maximum current of voltage rail

+5V 25.0A 33.0A

+3.3V 18.0A 33.0A

+12V 5.0A 5.5A

-12V 0.5A 1.0A

Note: The maximum power of each voltage rail is limited by the total module power of 250W, and the combined output of+5V and+3.3V cannot exceed the overall limit of the module.

3.2 Power Budget Calculation and Allocation

Before installing the module, it is necessary to calculate the total current of all peripheral modules on each voltage rail and ensure that it does not exceed the total capacity of the chassis (standard version with a total power of 500W, high-power version with 1000W). Pay special attention to the+12V rail - many RF and digital modules consume a lot, with the standard version having a maximum of only 5.5A/module for+12V. The total capacity of two modules connected in parallel can reach 11A (but current sharing and redundancy need to be considered). If a module single track exceeds the limit, it may trigger power protection.

3.3 Redundancy and Hot Plug

The standard version of the two power supplies adopts a current sharing working mode. When one fails, the other can temporarily bear all the load (but the capacity may be insufficient, it is recommended to use it at a reduced capacity). The four power supplies of the high-power version are equally distributed and support 3+1 redundancy (any damage does not affect system operation). All power modules support hot swapping - without shutting down, simply unplug damaged modules and insert new modules to automatically integrate into the system.

3.4 Power control and monitoring signals

Multiple control/status interfaces are provided on the backplane (see Appendix B for details):

INH # (J6): External prohibition signal, can remotely turn off DC output.

RST # (J8): System reset signal input.

FAL # (J9): Power failure input, used for external monitoring.

J5: LED power status connector, indicating whether each voltage rail is normal.

CN5 (SMBus): System management bus, connected to system slot P2, can query power health status, temperature, etc.

JP1:10MHz reference clock selection jumper - default internal clock. If an external clock is required (via PXI_CLK10-IN in Slot 2), move the jumper to pins 2-3.

Cooling System and Thermal Management

PXIS-3320 is equipped with 10 80 × 80 × 25mm double ball bearing fans, divided into upper and lower layers:

Bottom 5 fans: used for air intake (cold air is drawn in from below).

Top 5 fans: used for exhaust (hot air is discharged from above).

The total air volume is up to 482 CFM (241 CFM per floor), the speed is 4000-5000 RPM, and each fan consumes 2.64W (12V power supply). Such strong airflow ensures that the internal temperature of the chassis remains uniformly cooled even at an ambient temperature of 50 ℃, effectively protecting high heating modules.

The fan tray can be directly pulled out from the front panel (hot swappable), and each tray has an independent LED indicating the working status (normally on, flashing indicates a fault). When the fan fails, the system alarm buzzer sounds and the front panel fan LED flashes, reminding maintenance personnel to replace it.

Front panel monitoring and alarm system

Three sets of LED indicator lights are provided in the upper right corner of the front panel:

Power (green): Constant light indicates that all DC voltages (+3.3V,+5V,+12V, -12V) are outputting normally.

Temperature (red): Constant brightness indicates that the internal temperature is less than 50 ℃; Flashing indicates temperature>50 ℃ (warning).

Fan (amber): Always on indicates normal fan speed; Flashing indicates at least one fan malfunction.

In addition, the chassis is equipped with a built-in buzzer that emits a continuous beep sound when there is any abnormality in the power supply, temperature, or fan. The front panel is equipped with an "Alarm Reset" button. When pressed, the buzzer stops sounding and the alarm system is reset. But if the fundamental problem is not resolved, the alarm will be triggered again in a few minutes.

Hardware installation steps and grounding strategy

6.1 Installation process

Place the chassis on a stable flat surface (desktop or rack), ensuring that the bottom and top ventilation openings are unobstructed.

Confirm that the power switch is in the OFF position (the switch protrudes from the panel).

Connect the AC power cord to a well grounded socket.

Install the system controller module:

Release its ejector/injector handles.

Slide smoothly along the upper and lower guide rails until the handle automatically locks, then tighten the front panel fixing screws.

Install each peripheral module in sequence (also fixed with a handle).

Press the power switch on the front panel (ON when pressed), and the green Power LED will light up, indicating that the fan is running.

If there is no response after pressing, refer to the "Troubleshooting" section below for handling.

6.2 Grounding and Isolation

The installation holes on the backboard are divided into two categories:

GND (circular pad): connected to the signal ground plane.

FGND (Square Solder Pad): Connected to the power ground (earth) and isolated from the signal ground.

When leaving the factory, the backplane is fixed to the chassis through FGND mounting holes, so the signal ground is isolated from the chassis ground, which is conducive to eliminating ground loop interference. If the application requires short circuiting the signal ground to ground (such as reducing common mode noise), the GND can be short circuited to the FGND pad through an external jumper (caution should be taken as it may increase the ground loop current).

Common troubleshooting process

Fault phenomenon 1: Press the power switch, the system has no response, the Power LED does not light up, and the fan does not turn

Check if the power cord is properly plugged in and if the socket has power (test with other devices).

Confirm whether the magnetic circuit breaker at the back of the chassis is in the ON position (if tripped, the power switch needs to be turned off first and then manually reset).

Observe the POWER LED and FAILT LED on the power module panel: If the FAILT lights orange, it indicates internal damage and the power module needs to be replaced.

If multiple power modules do not respond, it may be a backplane fault or a power management circuit issue. Contact technical support.

Fault phenomenon 2: Intermittent restart or power failure of the system

Calculate whether the total load is close to the upper limit of power capacity (500W/1000W). If overloaded, the power supply will shut down due to overcurrent protection.

Check if the+12V rail current exceeds 5.5A/module (standard version total 11A), and remove the high power consuming module for step-by-step testing.

Check if the AC input voltage is stable (below 100V or above 240V may trigger protection).

Fault phenomenon 3: Temperature LED flashing or buzzer alarm

Check if the upper and lower air vents of the chassis are blocked and if the fan is stopped (check the Fan LED).

If the fan is normal but the ambient temperature is too high (>50 ℃), it is necessary to improve the heat dissipation in the computer room.

If the alarm is triggered again after resetting, some modules may experience abnormal heating, which can be investigated using a thermal imager.

Fault phenomenon 4: The system cannot recognize or freezes after inserting a new module

Confirm module compatibility with PXI specifications (note 3.3V/5V (I/O) voltage selection). There are VIO selection terminals (J1/J3/J4/J7) on the backplane. The factory default VIO is+5V. If the module is a 3.3V I/O, it needs to be re jumper (short circuit J3 and J7, disconnect J1).

Check if the module is properly positioned and if the handle is locked (poor contact can cause abnormal power or signal).

If the module requires an independent power supply, ensure that its power consumption is within the budget.

Fault phenomenon 5: Star triggered or insufficient synchronization accuracy

Confirm that Slot 2 has installed a star shaped trigger controller and the trigger input of the peripheral module is set to use the PX_STAR signal.

Check if the selection of the 10MHz clock source (JP1) is consistent with the system requirements (default internal).

Use an oscilloscope to measure the signal quality of PXI_TRIG and PXI_CLK10, and confirm that there is no overshoot or distortion.

Preventive maintenance and cleaning

Daily inspection: Check the status of the front panel LED every quarter to confirm that there are no alarms; Monitor whether the fan noise is abnormal (bearing wear).

Cleaning the interior: After turning off the power, open the chassis and use low-pressure dry airflow (such as canned air) to remove dust, especially in the fan and heat sink areas. If the stain is stubborn, it can be cleaned with a 75% isopropanol solution combined with a soft bristled brush, and then rinsed with deionized water (ensure complete drying before powering on).

Cleaning the exterior: Wipe the front panel and chassis with a slightly damp lint free cloth to avoid corrosive solvents.

Replace the fan: When the Fan LED flashes, follow the steps below:

Loosen the thumb screw on the faulty fan tray panel.

Observe the LED on the tray (flashing fan indicates a malfunction).

Remove the fixing screws on both sides of the tray and pull out the tray.

Replace the fan with a new one (pay attention to the airflow direction: bottom inlet, top outlet).

Reinstall the tray and reset the alarm.

Replace power module: Release the handle, pull out the old module, insert the new module (pay attention to aligning the guide rail), and lock the handle in place. The power supply will automatically distribute current without the need for additional configuration.

Summary of Electrical and Environmental Regulations

Working temperature: 0~50 ℃ (both models are the same).

Relative humidity: 10%~90% (no condensation).

Vibration (working): 5-500Hz, 0.5 GRMS (axial direction).

Impact (non working): 15G peak, 11ms half sine.

Safety certification: CE, FCC Class A; UL94V-0 flame retardant rating for backing board.