ltspice model for a kettle element !
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From: IanM on 31 Jul 2010 05:57 Anyone like to suggest some improvements to my simulation of a relay switching a kettle element? I guessed at all values - the inductor value , no clue what that would be anyway Version 4 SHEET 1 880 680 WIRE 320 -272 0 -272 WIRE 320 -224 320 -272 WIRE 0 -192 0 -272 WIRE 0 0 0 -112 WIRE 192 0 0 0 WIRE 192 32 192 0 WIRE 320 80 320 -144 WIRE -64 96 -480 96 WIRE 0 112 0 0 WIRE -48 128 -128 128 WIRE -480 160 -480 96 WIRE 192 160 192 112 WIRE -64 176 -64 96 WIRE -48 176 -64 176 WIRE -480 272 -480 240 WIRE -128 272 -128 128 WIRE -128 272 -480 272 WIRE -96 272 -128 272 WIRE 0 272 0 192 WIRE 0 272 -16 272 WIRE 192 272 192 224 WIRE 192 272 0 272 WIRE 320 272 320 160 WIRE 320 272 192 272 WIRE -128 304 -128 272 FLAG -128 304 0 SYMBOL sw 0 96 R0 SYMATTR InstName S1 SYMATTR Value RELAYSW SYMBOL voltage 0 -208 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value SINE(0 240 50) SYMBOL res 304 64 R0 SYMATTR InstName R1 SYMATTR Value 20 SYMATTR SpiceLine pwr=3K SYMBOL ind 304 -240 R0 SYMATTR InstName L1 SYMATTR Value 90� SYMATTR SpiceLine Ipk=13 Rser=0.5 SYMBOL voltage -480 144 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value PULSE(0 12 1 1u 1u 1 2 5) SYMBOL res 0 256 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R2 SYMATTR Value 1000K SYMBOL res 176 16 R0 SYMATTR InstName R3 SYMATTR Value 1000K SYMBOL cap 176 160 R0 SYMATTR InstName C1 SYMATTR Value 0.1� TEXT -330 -56 Left 0 !.tran 0 2.1 1.9 0.01 TEXT -232 392 Left 0 !.model RELAYSW SW[Ron=0.1 Roff=1G Vt=9 Vh=.4]
From: John Fields on 31 Jul 2010 12:59 On Sat, 31 Jul 2010 10:57:42 +0100, "IanM" <nobody(a)no_where.co.uk> wrote: >Anyone like to suggest some improvements to my simulation of a relay >switching a kettle element? --- Version 4 SHEET 1 880 680 WIRE 320 -16 64 -16 WIRE 320 16 320 -16 WIRE 272 32 176 32 WIRE 64 128 64 -16 WIRE 176 128 176 32 WIRE 320 128 320 96 WIRE 64 272 64 208 WIRE 176 272 176 208 WIRE 176 272 64 272 WIRE 272 272 272 80 WIRE 272 272 176 272 WIRE 320 272 320 208 WIRE 320 272 272 272 WIRE 64 368 64 272 FLAG 64 368 0 SYMBOL sw 320 112 M180 SYMATTR InstName S1 SYMATTR Value RELAYSW SYMBOL voltage 64 112 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 3 24 104 Invisible 0 SYMATTR InstName V1 SYMATTR Value SINE(0 240 50) SYMBOL res 304 112 R0 SYMATTR InstName R1 SYMATTR Value 20 SYMATTR SpiceLine pwr=3K SYMBOL voltage 176 112 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 3 24 104 Invisible 0 SYMATTR InstName V2 SYMATTR Value PULSE(0 12 0 1u 1u .1 .2) TEXT 88 296 Left 0 !.tran 1 uic TEXT 88 328 Left 0 !.model RELAYSW SW[Ron=0.1 Roff=1G Vt=9 Vh=.4]
From: IanM on 31 Jul 2010 13:52 "John Fields" <jfields(a)austininstruments.com> wrote in message news:ail85650qjrh8s7s9mv8ekob4i8hvf0ouk(a)4ax.com... > On Sat, 31 Jul 2010 10:57:42 +0100, "IanM" <nobody(a)no_where.co.uk> > wrote: > >>Anyone like to suggest some improvements to my simulation of a relay >>switching a kettle element? > > --- > Version 4 > SHEET 1 880 680 > WIRE 320 -16 64 -16 > WIRE 320 16 320 -16 > WIRE 272 32 176 32 > WIRE 64 128 64 -16 > WIRE 176 128 176 32 > WIRE 320 128 320 96 > WIRE 64 272 64 208 > WIRE 176 272 176 208 > WIRE 176 272 64 272 > WIRE 272 272 272 80 > WIRE 272 272 176 272 > WIRE 320 272 320 208 > WIRE 320 272 272 272 > WIRE 64 368 64 272 > FLAG 64 368 0 > SYMBOL sw 320 112 M180 > SYMATTR InstName S1 > SYMATTR Value RELAYSW > SYMBOL voltage 64 112 R0 > WINDOW 123 0 0 Left 0 > WINDOW 39 0 0 Left 0 > WINDOW 3 24 104 Invisible 0 > SYMATTR InstName V1 > SYMATTR Value SINE(0 240 50) > SYMBOL res 304 112 R0 > SYMATTR InstName R1 > SYMATTR Value 20 > SYMATTR SpiceLine pwr=3K > SYMBOL voltage 176 112 R0 > WINDOW 123 0 0 Left 0 > WINDOW 39 0 0 Left 0 > WINDOW 3 24 104 Invisible 0 > SYMATTR InstName V2 > SYMATTR Value PULSE(0 12 0 1u 1u .1 .2) > TEXT 88 296 Left 0 !.tran 1 uic > TEXT 88 328 Left 0 !.model RELAYSW SW[Ron=0.1 Roff=1G Vt=9 Vh=.4] > Thanks John, so negligible inductance ? Ian
From: John Fields on 31 Jul 2010 15:01 On Sat, 31 Jul 2010 18:52:33 +0100, "IanM" <nobody(a)no_where.co.uk> wrote: > >"John Fields" <jfields(a)austininstruments.com> wrote in message >news:ail85650qjrh8s7s9mv8ekob4i8hvf0ouk(a)4ax.com... >> On Sat, 31 Jul 2010 10:57:42 +0100, "IanM" <nobody(a)no_where.co.uk> >> wrote: >> >>>Anyone like to suggest some improvements to my simulation of a relay >>>switching a kettle element? >> >> --- >> Version 4 >> SHEET 1 880 680 >> WIRE 320 -16 64 -16 >> WIRE 320 16 320 -16 >> WIRE 272 32 176 32 >> WIRE 64 128 64 -16 >> WIRE 176 128 176 32 >> WIRE 320 128 320 96 >> WIRE 64 272 64 208 >> WIRE 176 272 176 208 >> WIRE 176 272 64 272 >> WIRE 272 272 272 80 >> WIRE 272 272 176 272 >> WIRE 320 272 320 208 >> WIRE 320 272 272 272 >> WIRE 64 368 64 272 >> FLAG 64 368 0 >> SYMBOL sw 320 112 M180 >> SYMATTR InstName S1 >> SYMATTR Value RELAYSW >> SYMBOL voltage 64 112 R0 >> WINDOW 123 0 0 Left 0 >> WINDOW 39 0 0 Left 0 >> WINDOW 3 24 104 Invisible 0 >> SYMATTR InstName V1 >> SYMATTR Value SINE(0 240 50) >> SYMBOL res 304 112 R0 >> SYMATTR InstName R1 >> SYMATTR Value 20 >> SYMATTR SpiceLine pwr=3K >> SYMBOL voltage 176 112 R0 >> WINDOW 123 0 0 Left 0 >> WINDOW 39 0 0 Left 0 >> WINDOW 3 24 104 Invisible 0 >> SYMATTR InstName V2 >> SYMATTR Value PULSE(0 12 0 1u 1u .1 .2) >> TEXT 88 296 Left 0 !.tran 1 uic >> TEXT 88 328 Left 0 !.model RELAYSW SW[Ron=0.1 Roff=1G Vt=9 Vh=.4] >> >Thanks John, --- You're welcome. :-) --- >so negligible inductance ? --- Yup.
From: Helmut Sennewald on 1 Aug 2010 03:44
Hello Ian, If it's abuot 240V AC, you should replace SINE(0 240 50) with SINE(0 339.4 50) when you want simulate real behavior over time. ..TRAN analysis: specify peak value -> SINE(0 339.4 50) ..AC analysis: specify RMS-value -> .AC 240 Best regards, Helmut |