Surge supressing for Solid State Relay?
hi there. i'm having problem couple ssrs in test box built dieing.
basically, box (and power supply) used charge large inductor coil. role works great. 3 inductor coils (a b , c) attached @ 1 end. box used direct current needed (a+b-, a+c-, b+c-). used check polarity of unit @ number of points. works fine that. solid state relay in question used switch 15v@5a used charge coils during test. relay using rated 220vdc@25a.
clearly should safe rating of relay (even assuming voltage spike when coil discharged)
my thought why relay has broken is used check inductor array after hipot test (2000vdc). know fact there bit of capacitance unit (if touch of 3 a,b,c terminals or 1 of them core, it'll give little jolt). i'm guessing when unit hooked testing fixture, charge unit holds giving little jolt relay, , after few weeks of operating, bye bye relay.
so i'm working couple angles try , counter this. aside manual way of shorting terminals ground discharge them first, suggestions on surge protection method added relay?
basically, box (and power supply) used charge large inductor coil. role works great. 3 inductor coils (a b , c) attached @ 1 end. box used direct current needed (a+b-, a+c-, b+c-). used check polarity of unit @ number of points. works fine that. solid state relay in question used switch 15v@5a used charge coils during test. relay using rated 220vdc@25a.
clearly should safe rating of relay (even assuming voltage spike when coil discharged)
my thought why relay has broken is used check inductor array after hipot test (2000vdc). know fact there bit of capacitance unit (if touch of 3 a,b,c terminals or 1 of them core, it'll give little jolt). i'm guessing when unit hooked testing fixture, charge unit holds giving little jolt relay, , after few weeks of operating, bye bye relay.
so i'm working couple angles try , counter this. aside manual way of shorting terminals ground discharge them first, suggestions on surge protection method added relay?
i don't find description of arrangement informative. can provide schematic? how hipot test carried out?
if use ssrs break 5a current flow coils, can expect large inductive spike, quite possibly more 220vdc depending on inductance , capacitance of coils , core material. when switching inductive dc load ssr or other device, should use either flyback diode (possibly resistor in series, if need current decay faster), or r-c snubber network (but may not practical 5a 15v load).
if use ssrs break 5a current flow coils, can expect large inductive spike, quite possibly more 220vdc depending on inductance , capacitance of coils , core material. when switching inductive dc load ssr or other device, should use either flyback diode (possibly resistor in series, if need current decay faster), or r-c snubber network (but may not practical 5a 15v load).
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