Elma VPX 6U User manual

VPX 6U CONDUCTION COOLED LOAD CARD
User Manual

DCA077534
CAE030387
Rev. B | 08.10.17
Contents
Introduction .....................................................................................................................................1
Product Features ............................................................................................................................1
Front Panel Control & Monitoring ...................................................................................................2
Side Panel Control & Monitoring ....................................................................................................3
Operating Instructions ................................................................................................................... 4
a. Go-No-Go LEDs ............................................................................................................ 4
b. External Voltage Measurements ................................................................................... 5
c. Remote Load Control .................................................................................................... 6
d. Remote Voltage/Signal Monitoring ................................................................................ 7
e. Temperature Monitoring ................................................................................................ 8
f. Over-Temperature Protection ......................................................................................... 9
Appendix
VPX 6U Module Connector Pin Diagrams .................................................................................... 10-14
Power Wafer Current Ratings ....................................................................................................... 15
Table of Contents

DCA077534
CAE030387
Rev. B | 08.10.17
1
Introduction
Introduction
In a given system platform, there is a general need of a hardware that can test the power handling and dissipation capabilities
within a given environment. Keeping this in mind ELMA Electronic Inc. has developed a Conduction Cooled Load Card in 6U
form factor to test the conduction cooled VPX based system platforms.
VPX 6U Conduction Cooled Load Card (herein referred to as "Load Card") gives a step-loading capability to the user to test
the VPX based system power supplies under a given environment. It can act as a thermal load to evaluate the system’s
thermal performance. The user can either monitor the power supply voltage at various loads by monitoring the Go-No-Go
LEDs on the front panel or perform an external measurement with a multimeter or scope.
Product Features
The Load Card is built around the electronic load elements as compared to traditional resistive load approach. The loads are
BJT-based constant current sources. This allows for the high power load elements to t in a compact space. Given below is
the list of features of the Load Card.
• A total load capacity of 150W is provided using six VPX power supplies.
• A stepped load control is provided by user accessible jumpers on the side of the Load Card.
• Six visual bi-color Go-No-Go LEDs for Vs1=12V, Vs2=12V, Vs3=5V, +12V_Aux, -12V_Aux and 3.3V_Aux are provided.
• Seven test point outputs are provided to monitor the voltage externally via a multimeter or a scope. SYSRESET signal is
provided on a separate test point.
• Two K-Type thermocouple outputs are provided on DSUB-15 to monitor temperature of thermal management interfaces
independently.
• The above mentioned seven test point outputs are also provided on DSUB-15 connector for remote monitoring.
• Remote control of the electronic load elements using external voltage source is provided.
• Operating temperature range is between -40°C to 70°C.
• Built in over-temperature protection.
• The design is based on the ANSI/VITA 46.0 and the ANSI/VITA 48.2 specication and fully compatible with OpenVPX
(VITA 65 Specication) designs.
• The Load Card has 5HP pitch.
Front/Side Panel Control and Monitoring
Based on the Load Card functionality the front panel controls can be grouped in six categories as shown in gure 1 and
gure 2.
• Go-No-Go LEDs
• External Voltage Measurements
• Temperature Monitoring
• Remote Load Control
• Remote Voltage/Signal Monitoring
• Local Load Stepping

DCA077534
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Rev. B | 08.10.17
Front Panel Control and Monitoring
Go-No-Go LEDs
2
External Voltage
Measurements
Temperature
Monitoring
Remote Load Control
Remote Voltage/Signal
Monitoring
Go-No-Go LEDs
Figure 1

DCA077534
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Rev. B | 08.10.17
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Side Panel Control and Monitoring
Local Load
Stepping
Local Load
Stepping
Figure 2

DCA077534
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Rev. B | 08.10.17
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Operating Instructions
The operation of the Load Card is described based on the grouping of the control and monitoring sections shown in Figure
1 and Figure 2.
Go-No-Go LEDs
The Load Card has six window voltage monitor circuits to monitor six VPX power supplies. Each circuit monitors its own
voltage window per ANSI/VITA 46.0. The Load Card continuously monitors the voltages and compares them against
the minimum and maximum limits set in the hardware. If any of the six VPX system voltages are out of range then the
corresponding Go-No-Go LED will go RED. If all the voltages are within the range then the corresponding Go-No-Go LEDs
will be GREEN. Table 3 below indicates the valid voltage limits on all six VPX supplies per ANSI/VITA 46.0 specication.
Table 1 below indicates the voltage limits.
Front Panel VPX PSU Voltage Desig-
nators Voltage Lower Limit Voltage Upper Limit
Vs1 12V 11.4V 12.6V
Vs2 12V 11.4V 12.6V
Vs3 5V 4.875V 5.25V
+12V_Aux 11.4V 12.6V
-12V_Aux -12.6V -11.4V
3.3V_Aux 3.135V 3.465V
Table 1
External Voltage Measurements
The test points provided on the front panel provides the voltage measurement points for all the six VPX power supplies.
There are total of seven RED test points. Six test points are for voltage measurements and the seventh test point is provided
to monitor the SYSRESET signal. The BLACK test jack is the GND reference for all the test points. Table 2 below shows the
nominal voltage outputs on the test points.
Voltage Lower Limit Voltage Nominal Voltage Upper Limit
Vs1 12V 11.4V 12V 12.6V
Vs2 12V 11.4V 12V 12.6V
Vs3 5V 4.875V 5V 5.25V
+12V_Aux 11.4V 12V 12.6V
-12V_Aux -12.6V -12V -11.4V
3.3V_Aux 3.135V 3.3V 3.465V
SYSRESET N/A 2.94V N/A
Table 2
Note: The voltage output limits are dened by ANSI/VITA 46.0.
The size of the test points is selected to mate with the standard Fluke multimeter probes.
Front Panel VPX PSU Volt-
age Designators

DCA077534
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Only one jumper
per voltage header
is allowed
5
Operating Instructions
Local Load Stepping
Local Load Stepping jumpers allows the loading of each of the six VPX power supplies independently. One jumper is
provided for each header to ensure that only one step is set at a time for each supply header. Table 3 below provides all the
load values at each header location when the jumper is placed on it.
VPX Voltage
Name
OFF
Jumper
10W
Jumper
20W
Jumper
30W
Jumper
40W
Jumper
50W
Jumper
Vs1+12V 0W 10W 20W 30W 40W 50W
Vs2+12V 0W 10W 20W 30W 40W 50W
Vs3+5V 0W 10W 20W 30W 40W 40W
OFF
Jumper
2W
Jumper
4W
Jumper
+12V_Aux 0W 2W 4W 4W
-12V_Aux 0W 2W 4W 4W
OFF
Jumper
1W
Jumper
2W
Jumper
3.3V_Aux 0W 1W 2W 2W
Table 3
For example, to set a load of 30W on voltage Vs1= +12V, rst locate the header next to silkscreen marking Vs1 +12V. Then
insert the jumper in the location labeled 30W. If no load is needed on the voltage Vs1 +12V then the jumper should be
inserted in the location labeled OFF.
Warning: Placing multiple jumpers on any header can damage the electronic load.
Header
Only one jumper
per voltage header
is allowed
Only one jumper
per voltage header
is allowed
Figure 3

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Rev. B | 08.10.17
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Operating Instructions
Remote Load Control
Along with Local Load Stepping an option to remotely control the loads via external voltage is provided. This option is
provided to test an enclosed chassis where there will be no access to Local Load Stepping jumpers. This control provides
variable wattage steps anywhere from 0W to 146W using external voltage source.
In order to use the remote load control feature, set the Local Load Stepping jumpers labeled V CNTRL for all the VPX
supply voltages that need to be remotely controlled. Local Load Stepping on the VPX supplies that are not set for remote
control can still work in local mode. Connect an external 0V to 5V variable PSU to pins 12 and 13 on DBSUB-15, where pin
12 connects to the GND, and pin 13 connects to the positive voltage. The external PSU should be able to source 20mA of
current. The graph in gure 4 shows the relationship between the load wattage and V CNTRL voltage.
Warning: Applying more than 5V to V CNTRL can overheat and damage the loads.
Note: The -12V_Aux supply is not available for remote control but can be used in local mode during remote control.
Figure 4

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Operating Instructions
Remote Voltage/Signal Monitoring
VPX supply voltages and SYSRESET signal can be monitored remotely from an enclosed chassis. All the signals are pinned
on the DSUB-15 connector. Table 4 provides the DSUB-15 connector pin out.
Pin Name
1
2
3
Signal
CHROMEGA(+) ( White Pin, Yellow Wire, Top Thermocouple)
ALOMEGA(-) ( Green Pin, Red Wire, Top Thermocouple)
-12V Aux (Remote Voltage Monitoring)
4
5
6
3.3V Aux (Remote Voltage Monitoring)
+12V Aux (Remote Voltage Monitoring)
Vs3 +5V (Remote Voltage Monitoring)
7
8
9
Vs1 +12V (Remote Voltage Monitoring)
Vs2 +12V (Remote Voltage Monitoring)
CHROMEGA(+) ( White Pin, Yellow Wire, Bottom Thermocouple)
10
11
12
ALOMEGA(-) (Green Pin, Red Wire, Bottom Thermocouple)
No Connection
V CNTRL GND (Voltage Control GND)
13
14
15
V CNTRL (Voltage Control)
GND (Remote Voltage/Signal Monitoring GND)
SYSRESET (Remote Signal Monitoring)
Table 4
Any standard DSUB-15 mating female connector and pins can be used to connect to the DSUB-15 connector on the load
card. The only exception is the set of pins used for K-Type thermocouples. This is discussed in the next section.
Temperature Monitoring
The thermal impedance of the thermal management interfaces is very critical in order to transfer all the heat generated by
plug-in modules. Therefore two K-Type thermocouples are placed inside each thermal management interface to monitor their
temperature. Any standard off-the-shelf K-Type thermocouple acquisition hardware can be used to record the temperature
for analysis. The thermocouple output connections are provided on the DSUB-15 connector using K-Type thermocouple
crimps. When making a harness to connect to the thermocouples mating pins, the K-Type extension wire with K-Type crimps
must be used. Using regular crimps and wire to interface to the thermocouple on DSUB-15 connector would give incorrect
temperature readings. Table 5 provides the recommended crimp and wire part numbers available from Omega.

DCA077534
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Rev. B | 08.10.17
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Operating Instructions
Part Description
CHROMEGA(+) K-Type Crimp
ALOMEGA(-) K-Type Crimp
Extension Wire K-Type
OMEGA Part Number
SMTC-CH-S
SMTC-AL-S
FF-K-24-25
Over Temperature Protection
Each Load Card has an over temperature protection feature which shuts off the loads in case of excessive heating. The
temperature switch used on the load card has a trip point set at 110°C.
Table 5

DCA077534
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Rev. B | 08.10.17
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Appendix
VPX 6U Module Connector Pin Diagrams
Tables 1 to 13 below are the pin outs of VPX 6U Module connectors based on ANSI/VITA 46.0 specication.
P0 Connector Pin Out
P1 Connector Pin Out
Table 1
Table 2

DCA077534
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Rev. B | 08.10.17
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Appendix
P2 Connector Differential Pin Out
P2 Connector Single Ended Pin Out
Table 3
Table 4

DCA077534
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Rev. B | 08.10.17
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Appendix
P3 Connector Differential Pin Out
P3 Connector Single Ended Pin Out
Table 5
Table 6

DCA077534
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Rev. B | 08.10.17
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Appendix
P4 Connector Differential Pin Out
P4 Connector Single Ended Pin Out
Table 7
Table 8

DCA077534
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Rev. B | 08.10.17
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Appendix
P5 Connector Differential Pin Out
P5 Connector Single Ended Pin Out
Table 9
Table 10

DCA077534
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Rev. B | 08.10.17
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Appendix
P6 Connector Differential Pin Out
P6 Connector Single Ended Pin Out
Table 12
Table 11

DCA077534
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Rev. B | 08.10.17
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Appendix
Power Wafer Current Rating
Using the table 5 (from ANSI/VITA 46.0 specication) below, the maximum power handling capacity of VPX 3U module can
be calculated.
Table 13