Electrical – How to install a scr model in ltspice

From the LTSPice IV manual:

X. Subcircuit 
Syntax: Xxxx n1 n2 n3... <subckt name> 
[<parameter>=<expression>] 
Subcircuits allow circuitry to be defined and stored in a 
library for later retrieval by name. Below is an example of 
defining and calling a voltage divider and invoking it in a 
circuit. 
* calling a subcircuit 
* 
* This is the circuit 
X1 in out 0 divider top=9K bot=1K 
V1 in 0 pulse(0 1 0 .5m .5m 0 1m) 
* This is the subcircuit 
.subckt divider A B C 
R1 A B {top} 
R2 B C {bot} 
.ends divider 
.tran 3m 
.end 

Notice that params: never appears in the LTSpice syntax for a subcircuit call.

I am guessing that including this token in your X card has confused LTSpice about how the subcircuit should be called.

If the model definition is a whole subcircuit (starts with .SUBCKT), you need to use the X prefix: Ctrl + Right click on the component, and set the prefix value to "X".

Also check that the Value is set according to the name of the SUBCKT.

Also check that you have an ".include" directive somewhere on your schematic, set with the correct path of the file. Alternatively, you can paste the entire component description within a spice directive block on your schematic, but it takes a lot of space.

I wouldn't recommend putting the definition within standard.bjt file, as you seem to have done. I think you can't put whole SUBCKT in there (I also seem to remember it requires restarting LTSpice).