Power Supply switching

Hi,
I am not sure whether this is the correct forum to post this question but I think it may be a problem which may be common and someone may be able to help.
I am currently using a TTi TSX3510P DC power supply to drive a simple electro-magnet. One end of the windings goes to the positive and one to the negative of the supply (obviously) which allows me to ramp the current up through lab view to +10 amps crteating a magnetic field.The problem is I would now like to drive the current to -10 amps, the simple solution is to obviously switch the wires around on the supply but I wish to perform an automatic sweep utilising lab view from -10 to +10 amps. I am sure that there is circuitry out there to perform this operation. If anyone knows where and how to utilise this circuitry with labview I would be much obliged.
Thanks
Regards
Marc

You might want to check into NI's USB based DAQ. Since you are ramping using GPIB to control the supply I'm presuming that it is changing relatively slowly, which would allow the USB DAQ. I don't know what their price is in the UK, they start out around $245US with both analog and digital. You would also need a relay with: contacts rated at the maximum current expected, which should also be powered by a separate power supply and have its own driver circuitry (DAQ cards generally don't supply sufficient current to run relays directly). A US company, ELK products, makes a relay card with the appropriate circuitry, for about $20 US. I know that one model, ELK-924, has contacts rated to 7A @ 30VDC, I don't know if that is "hot switched" or just what they are rated for. I think hot switched as they have a separate 10A @125VAC rating. You would need a small 12V @~1A power supply to provide it with power (a "Wall Wart" supply should be fine), but it only requires the control signal to supply 1.2mA, with most DAQ digital I/O capabilities. You would need to be careful not to switch the relay while the electromagnets full current was flowing, the field collapse would generate a large voltage/current across the relay's contacts. The normal method of putting a reverse diode across the windings wouldn't work with your required polarity reversals.
Hope this helps,
P.M.
Putnam
Certified LabVIEW Developer
Senior Test Engineer
Currently using LV 6.1-LabVIEW 2012, RT8.5
LabVIEW Champion

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I have to control 10 gear boxes at a time and I have used E3436A power supply to supply 5.3V dc to all gear boxes. Once I start test gearboxes will powered on and generates the analog out pulses.
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If you don't know LabVIEW take a class

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SNMPv2-SMI::enterprises.9.9.13.1.1.0 = INTEGER: 13
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SNMPv2-SMI::enterprises.9.9.13.1.3.1.3.2006 = Gauge32: 40
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SNMPv2-SMI::enterprises.9.9.13.1.3.1.4.2006 = INTEGER: 59
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Hello,
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Hi All,
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3508G-XL
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Hi all,
my customer has a lot of WS-C2960XR-24PS-I (15.0(2)EX4) 24 and 48 Port switches, some are in a stacks, others not. All have 2 Powersupplies.(each 640 Watt)
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Additional Information:
CustomerSwitch#
Nov 27 09:28:44.622 CEST: %PLATFORM_ENV-1-FRU_PS_ACCESS: FRU Power Supply is not responding
CustomerSwitch#
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CustomerSwitch#
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CustomerSwitch#
--- ende -------
Release Notes for Catalyst 2960-X and 2960-XR Series Switches, Cisco IOS Release 15.0(2)EX5
---SNIP---
CSCuh65397
During the insertion or removal of a power supply, the following message might be displayed on the console:
%PLATFORM_ENV-1-FRU_PS_ACCESS: FRU Power Supply is not responding
There is no functional impact. There is no workaround.
---SNIP---

Hi ,
As per the Bug note, (see the Further Problem Description:)
Workaround:
NA
Further Problem Description:
If this log is repeated even after OIR, It should be different issue. It has to be debugged separately
Thanks,
VS.Suresh

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