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7-31
Example: Number of connectable units and settings
[Resistor type]
In a voltage time proportional output driven by SSR, the
DCP551
must enter the
SSR rated input voltage (optimum striking voltage of arc).
The
DCP551
employs a newly developed variable output system that can output
optimum striking voltage of arc to accommodate multiple SSR drives. A suitable
current value is set on the
DCP551
to obtain optimum striking voltage of arc for
the internal impedance of the SSR. An equivalent circuit with related equations is
shown below.
• Description of symbols
(1) Settings
I
0
: set
DCP551
output current (range: 2 to 22mA)
V
0
: end-to-end load voltage (13.2V)
V
SSR'
: actual voltage input to SSR
V
SSR
: rated input voltage range for SSR (
V
SSR/MIN
to
V
SSR/MAX
)
V
SSR/MIN
: minimum SSR rated input voltage
V
SSR/MAX
: maximum SSR rated input voltage
Z
:
: internal SSR impedance
V
D
: internal SSR voltage drop (normally about 1 to 2V)
(2) Equivalent circuit showing connection of one SSR
Equations (1) and (2) below must be satisfied.
V
SSR/MIN
≤
I
0
X Z + V
D
≤
V
0
Equation (1)
V
SSR'
≤
V
SSR/MAX
Equation (2)
(V
SSR'
= I
0
X Z + V
D
)
I
(V )
0
0
DCP551
SSR
V
SSR ’
Z
V
D
Chapter 7. PARAMETER SETUP
Model:6D(in case of C21=2 or 3)
C95
PGM10N
1unit
10 or more
2units(Parallel)
20 or more
PGM10F
1unit
12 or more
Settings
SSR to be used