Azbil dcp551 mark II - Page 138

7-32
(3) Equivalent circuit showing connection of n SSRs
Equations (3) and (4) below must be satisfied.
V
SSR/MIN ≤ I0 X Z+VD ≤ V0 /N Equation (3)
VSSR' ≤ VSSR/MAX Equation (4)
(VSSR' = I0 X Z + VD)
(4) Equivalent circuit showing parallel connection of n SSRs
Equations (5) and (6) below must be satisfied.
VSSR/MIN ≤ I0 /N X Z+VD ≤ V0 Equation (5)
VSSR' ≤ VSSR/MAX Equation (6)
(VSSR' = I0 /N X Z + VD)
I
(V )
0
0
SSR 1
V
Z
V
I /N
SSR n
V
SSR ’
Z
V
D
I /N
0
DCP551
SSR ’
D
0
I
(V )
0
0
SSR 1
V
SSR
’
Z
V
D
SSR n
V
SSR ’
Z
V
D
DCP551
Chapter 7. PARAMETER SETUP