USER GUIDE
NI PXIe-1085 Modular Power
Supply
The NI PXIe-1085 modular power supply is a replacement part for the NI PXIe-1085 chassis.
Caution This power supply is not compatible with any other National Instruments
chassis.
Introduction
To minimize downtime caused by a power-supply failure, the NI PXIe-1085 chassis has a
modular power supply.
Unpacking
Carefully inspect the shipping container and the power supply for damage. Check for visible
damage to the metal work. Check to make sure all handles, hardware, and connectors are
undamaged. Visually inspect the inside of the power supply for any possible damage, debris, or
detached components. If damage appears to have been caused during shipment, file a claim with
the carrier. Retain the packing material for possible inspection and/or reshipment.
What You Need to Get Started
NI PXIe-1085 chassis (the unit being repaired)
NI PXIe-1085 power supply
Read Me First: Safety and Electromagnetic Compatibility
NI PXIe-1085 User Manual (provided with the chassis; also available at ni.com/support)
#2 Phillips screwdriver
Installation and Maintenance
The information in this section is for qualified service personnel only. Read the Read Me First:
Safety and Electromagnetic Compatibility document included with your kit before using the
power supply.
Caution Many components within the chassis under repair are susceptible to static
discharge damage. Service the chassis only in a static-free environment. Observe
standard handling precautions for static-sensitive devices while servicing the chassis.
Always wear a grounded wrist strap, or equivalent, while servicing the chassis.
Caution Always disconnect the AC power cable before cleaning or servicing the
chassis.
Caution Never connect the AC power cable to the power supply until you install it
in a chassis. Do not use, test, or configure the power supply outside of a chassis.
The power supply is a replacement part for the NI PXIe-1085 chassis. The NI PXIe-1085 User
Manual contains all of the most up-to-date chassis service procedures, including removal and
replacement of power supplies. The chassis includes a hardcopy of the user manual; additionally,
you can download a softcopy from
Removal
Before attempting to replace the power supply, verify that there is adequate clearance behind the
chassis. Disconnect the power cable from the power supply on the back of the chassis. Identify
the eight mounting screws for the NI PXIe-1085 that attach the power supply to the chassis.
Using a Phillips screwdriver, remove the screws. Pull on the two rear handles of the power
supply to remove it from the back of the chassis, as shown in Figure . About halfway through
removing the shuttle, the rail safety catches engage to prevent the power supply from falling out.
Press down on the rail safety catches to remove the power supply the rest of the way, as shown
in Figure 1.
ni.com/support.
After removing the supply from the chassis, you can access the modular power supply. To
remove the modular power supply, first loosen the four screws that retain it. Refer to Figure for
the screw locations. After loosening the screws, you can remove the modular power supply by
rotating the handle away from the fans and pulling upward when it is in the upright position, as
shown in Figure 2.
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Figure 1. Removing Power Supply
1
5
3
2
4
1 Power Supply Mounting Screws (8x)
2 Power Supply
3 Modular Power Supply Screws (4x)
NI PXIe-1085 Modular Power Supply User Guide | © National Instruments | 3
4 NI PXIe-1085 Chassis
5 Rail Safety Catch (Both Sides)
Figure 2. Removing Modular Power Supply from Power Supply
3
2
1
1 Power Supply 2 Modular Power Supply 3 Modular Power Supply Handle
Installation
Ensure that there is no visible damage to the new power supply assembly. Verify that the housing
and connector on the new power supply assembly have no foreign material inside. Install the
new power supply assembly into the opening in the power supply in the reverse order of
removal. Replace and tighten the four screws with a Phillips screwdriver.
After installing the power supply assembly, slide the power supply into the opening in the rear
of the chassis. Tighten the eight screws with a Phillips screwdriver.
Configuration
The fan-speed selector switch is on the rear panel of the power supply. Select High for maximum
cooling performance (recommended) or Auto for quieter operation. Set the Inhibit Mode switch
to the Default position.
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Connecting Safety Ground
Caution The NI PXIe-1085 chassis are designed with a three-position NEMA 5-15
style plug for the U.S. that connects the ground line to the chassis ground. To
minimize shock hazard, make sure the electrical power outlet you use to power the
chassis has an appropriate earth safety ground.
If your power outlet does not have an appropriate ground connection, you must connect the
premise safety ground to the chassis grounding screw located on the rear panel. To connect the
safety ground, complete the following steps:
1. Connect a 16 AWG (1.3 mm) wire to the chassis grounding screw using a grounding lug.
The wire must have green insulation with a yellow stripe or must be noninsulated (bare).
2. Attach the opposite end of the wire to permanent earth ground using toothed washers or a
toothed lug.
Connecting to Power Source
Cautions Do not install modules prior to performing the following power-on test.
To completely remove power, you must disconnect the AC power cable.
Attach input power through the rear AC inlet using the appropriate AC power cable supplied.
The Inhibit Mode switch allows you to power on the chassis or place it in standby mode. Set the
Inhibit Mode switch on the back of the chassis to the Manual position. Observe that all fans
become operational and all three front panel LEDs are a steady green. Switching the Inhibit
Mode switch to the Default position allows the system controller to control the power supply.
Specifications
Caution Specifications are subject to change without notice.
Electrical
AC Input
Input voltage range ........................................... 100 to 240 VAC
Operating voltage range
Input frequency................................................. 50/60 Hz
Operating frequency range
Input current rating ........................................... 12 to 6 A
1
The operating range is guaranteed by design.
1
.................................. 90 to 264 VAC
1
.............................. 47 to 63 Hz
NI PXIe-1085 Modular Power Supply User Guide | © National Instruments | 5
Over-current protection..................................... 15 A circuit breaker
Line regulation
3.3 V.......................................................... <±0.2%
5 V............................................................. <±0.1%
±12 V ........................................................ <±0.1%
Efficiency.......................................................... 70% typical
Power disconnect
...............................................The AC power cable provides main power
disconnect. Do not position the equipment so that
it is difficult to disconnect the power cord. The
front-panel power switch causes the internal
chassis power supply to provide DC power to the
CompactPCI/PXI Express backplane. You also
can use the rear-panel 8-pin connector and inhibit
mode switch to control the internal chassis power
supply.
DC Output
DC current capacity (IMP)
Volta ge Maximum Current
+3.3 V 61 A
+5 V 50 A
+12 V 45 A
-12 V 4 A
5 V
AUX
Notes Maximum combined +3.3 V, +5 V, and +12 V power is 699 W.
Maximum total usable power is 701.5 W.
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2.0 A
Backplane slot current capacity
Slot +5 V V (I/O) +3.3 V +12 V -12 V 5 V
System Controller Slot 15 A — 15 A 30 A — 1 A
System Timing Slot — — 6 A 4 A — 1 A
Hybrid Peripheral Slot with
6 A 5 A 6 A 1 A 1 A —
PXI-1 Peripheral
Hybrid Peripheral Slot with
— — 6 A 4 A — 1 A
PXI-5 Peripheral
PXI-1 Peripheral Slot 6 A 11 A 6 A 1 A 1 A —
Notes Total system slot current should not exceed 45 A.
PCI V(I/O) pins in PXI-1 peripheral slots and hybrid peripheral slots are connected
to +5 V.
The maximum power dissipated in the system slot should not exceed 140 W.
The maximum power dissipated in a peripheral slot should not exceed 38.25 W.
Load regulation
Volta ge Load Regulation
+3.3 V <5%
AUX
+12 V <5%
+5 V <5%
-12 V <5%
Maximum ripple and noise (20 MHz bandwidth)
Volta ge Maximum Ripple and Noise
+3.3 V 50 mV
+12 V 50 mV
+5 V 50 mV
-12 V 50 mV
NI PXIe-1085 Modular Power Supply User Guide | © National Instruments | 7
pp
pp
pp
pp
Over-current protection..................................... All outputs protected from short circuit and
overload with automatic recovery
Over-voltage protection
3.3 V and 5 V ............................................ Clamped at 20 to 30% above nominal output
voltage
Power supply MTTR ........................................Replacement in under 5 minutes
Where to Go for Support
The National Instruments Web site is your complete resource for technical support. At
ni.com/support you have access to everything from troubleshooting and application
development self-help resources to email and phone assistance from NI Application Engineers.
A Declaration of Conformity (DoC) is our claim of compliance with the Council of the European
Communities using the manufacturer’s declaration of conformity. This system affords the user
protection for electromagnetic compatibility (EMC) and product safety. You can obtain the DoC
for your product by visiting
you can obtain the calibration certificate for your product at
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ni.com/calibration.
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373941A-01 Feb13
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