Honeywell DCP301 User Manual page 120

C 7 8 (voltage output 1 adjustment)
C 7 q (voltage output 2 adjustment)
When driving an SSR by voltage time-proportional output, the output voltage of the
controller must be within the input rated voltage (optimum ignition voltage) of the SSR.
On the DCP301, a newly developed variable output system is utilized that enables output
of the optimum ignition voltage even when driving two or more SSRs.
This system sets the optimum current value on the controller so that the optimum ignition
voltage with respect to the internal impedance of the SSR side can be obtained.
The following shows equivalent circuits and related formulas.
• Description of Symbols
(1) Details
I
V
V
V
V
V
Z
V
(2) Equivalent circuit when one SSR is connected
Formulas (1) and (2) formulas must be satisfied.
(1) formula V
(2) formula V
: Setting output current of controller (setting range: 2 to 22mA)
O
: Maximum applied load voltage (approx. 14.7V)
O
: Actual input voltage to SSR
SSR'
: Input rated voltage range of SSR (V
SSR
: Minimum input rated voltage of SSR
SSR/MIN
: Maximum input rated voltage of SSR
SSR/MAX
: Internal impedance of SSR
: Internal voltage drop of SSR (normally 1 to 2V)
D
DCP301
+
I
O
(V )
O
–
I
SSR/MIN O
< V
SSR' SSR/MAX
(V = I x Z + V
SSR' O
Chapter 7. PARAMETER SETUP
SSR/MIN
SSR
+
V
SSR'
V
–
x Z + V V
D O
)
D
to V )
SSR/MAX
Z
D
7-35