Honeywell DCP551 Mark ΙΙ User Manual page 133

Example: Number of connectable units and settings
Settings
SSR to be used
PGM10N 1unit
2units(Parallel)
PGM10F 1unit
[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 opti-
mum 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 : set DCP551 output current (range: 2 to 22mA)
0
V
: end-to-end load voltage (13.2V)
0
V
: actual voltage input to SSR
SSR'
V
: rated input voltage range for SSR (V
SSR
V
: minimum SSR rated input voltage
SSR/MIN
V
: maximum SSR rated input voltage
SSR/MAX
Z :
: internal SSR impedance
V
: internal SSR voltage drop (normally about 1 to 2V)
D
(2) Equivalent circuit showing connection of one SSR
,+2##
I
0
(V )
0
Equations [1] and [2] below must be satisfied.
× Z + V
V ≤ I
SSR/MIN 0
V ≤ V
SSR' SSR/MAX
× Z + V
= I
(V
SSR' 0
Chapter 7. PARAMETER SETUP
Model:6D(in case of C21=2 or 3)
10 or more
20 or more
12 or more
554
Z
V
SSR
V
D
≤ V
• • • • [1]
D 0
• • • • [2]
)
D
C95
to V
)
SSR/MIN SSR/MAX
7-31