Programming instructions

Basic Components
Multisim Component Reference Guide 2-32 ni.com
2.12 Relay
The magnetic relay can be used as a normally open or normally closed relay. It is activated
when the current in the energizing circuit (attached to
P
1
,
P
2
) exceeds the value of the
switch-on current (Ion). During operation, the contact switches from the normally closed
terminals (
S
1
, S
3
) to the normally open terminals (S
1
, S
2
). The relay will remain on as long as
the current in the circuit is greater than the holding current (
I
hd
). The value of I
hd
must be less
than that of
I
on
.
The magnetic relay is a coil with a specified inductance (Lc, in henries) that causes a contact
to open or close when a specified current (Ion, in A) charges it.
The contact remains in the same position until the current falls below the holding value (Ihd,
in A), at which point it returns to its original position.
A Cross-sectional area 1.0 m
2
L Core length 1.0 m
ISD Input smoothing domain 1.0% -
N Number of co-ordinates 2
H1 Magnetic field co-ordinate 1 0 A*turns/m
H2 Magnetic field co-ordinate2 1.0 A*turns/m
H3-H15 Magnetic field co-ordinates 0 A*turns/m
B1 Flux density co-ordinate 1 0 Wb/m
2
B2 Flux density co-ordinate 2 1.0 Wb/m
2
B3-B15 Flux density co-ordinates 0 Wb/m
2
Symbol Parameter Name Default Unit
ComponentRef.book Page 32 Thursday, December 7, 2006 10:12 AM