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Sorensen/Ametek Power Supply Does Not Supply Power When Commanded Via GPIB (IEEE488.2)
Solved!
Gabe_712
06-09-2021 03:53 PM
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I'm commanding a Sorensen/Ametek SGe Series DC Power Supply via GPIB (IEEE488.2) using NI MAX. My write and query commands all seem to work but no power turns on. When the unit is commanded manually (locally) in the same configuration it works.
The unit remote/local switch is in remote mode,
I'm using the correct GPIB Address.
Here's an example string of commands that seemingly works despite no power actually coming on:
Query *IDN?
Response Sorensen SGe...
Query *RST
Query *CLS
Query *SYST:LOCAL?
Response 0
Write OUTP:STAT 0
Query OUTP:STAT?
Response 0
Query SYST:ERR?
Response No Error
Write SOUR:VOLT 12.0
Write SOUR:CURR:LIM 10.0
Query SOUR:VOLT?
Response 12.0
Query SYST:ERR?
Response No Error
Write OUTP:STAT 1
Query OUTP:STAT?
Response 1
Query MEAS:VOLT?
Response 0.28
Query MEAS:CURR?
Response 0.0
Query SYST:ERR?
Response No Error
Query SYST:FAUL?
Response 0, 0, 0, 0
No Errors or faults are reported and the output when queried says it is on with the commanded voltage, however no power comes out/or is measured.
Link to programming Manual: https://www.powerandtest.com/-/media/ametekprogrammablepower/files/dc-power-supplies/sge-series/manu...
Solved! Go to Solution.
santo_13
06-10-2021 10:21 AM
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I have seen similar case, check if there is any DIP switch on the power supply to switch it into remote mode.
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06-10-2021 01:21 PM
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The remote/local switch is okay to be in local because when you send it a GPIB command it switches over to remote mode automatically (but yes remote mode is the correct position).
This wasn't the source of my problem but I realized that SOUR:CURR is the real "current limit" and SOUR:CURR:LIM is just a threshold that can't be programmed above. The "current limit" (SOUR:CURR) was defaulting to 0A on reset.
The source of the problem was that we were previously controlling the unit with an analog voltage controller and after removing this, we failed to replace the DSUB that came with the unit:
"Check the ANALOG CONTROL (J1) mating connector on the rear panel
to verify that Pins 5 and 6 (Remote Output On/Off) are shorted together to
enable the output of the supply."
