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
I0 : set DCP551 output current (range: 2 to 22mA)
V0 : end-to-end load voltage (13.2V)
VSSR' : actual voltage input to SSR
VSSR : rated input voltage range for SSR (VSSR/MIN to VSSR/MAX)
VSSR/MIN : minimum SSR rated input voltage
VSSR/MAX : maximum SSR rated input voltage
Z :: internal SSR impedance
VD : 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.
VSSR/MIN
≤ I0 X Z + VD ≤ V0
Equation (1)
VSSR' ≤ VSSR/MAX Equation (2)
(VSSR' = I0 X Z + VD)
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
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