I’ve got a central battery system at work which has slave emergency circuits.
There is a 230VAC supplyto a transformer which then has a rectifier supplying DC to the circuits. The bulkheads are custom made with inverter inside.
I can get a Zdb at the 230V supply, thus able to calculate the Zdb at the 110V load of transformer… however when using a Megger Loop Tester (LTW425) I receive the error code “Chck” which when I looked it up says it’s lost connection and retries after a couple seconds….
I can see 56V when testing, but no luck with an impedance reading. Is it because the meter can’t test DC directly?
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There is a 230VAC supplyto a transformer which then has a rectifier supplying DC to the circuits. The bulkheads are custom made with inverter inside.
I can get a Zdb at the 230V supply, thus able to calculate the Zdb at the 110V load of transformer… however when using a Megger Loop Tester (LTW425) I receive the error code “Chck” which when I looked it up says it’s lost connection and retries after a couple seconds….
I can see 56V when testing, but no luck with an impedance reading. Is it because the meter can’t test DC directly?
Continue reading...
