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C93 (time proportional output system)
C94 (time proportional output system)
0: Goes on again within time proportional cycle
1: Does not go on again within time proportional cycle
• This setting determines whether the output is to go on again after the result of a
• The difference between the two settings is illustrated below.
PID computation
result
C95 (voltage output control)
C96 (voltage output control)
In a voltage time proportional output driven by SSR, the DCP552 must enter the
SSR rated input voltage (optimum striking voltage of arc).
The DCP552 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 DCP552 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
PID computation has changed in a time proportional cycle (cycle time) and the
output has been turned off.
When set to 0
ON
OFF
20%
When set to 1
ON
OFF
PID computation
20%
result
(1) Settings
I
: set DCP552 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
DCP552
I
0
(V )
0
Equations (1) and (2) below must be satisfied.
V
≤ I
× Z + V
SSR/MIN
0
V
≤ V
SSR'
SSR/MAX
(V
= I
× Z + V
)
SSR'
0
D
Chapter 7. PARAMETER SETUP
Cycle time
50%
40%
Cycle time
50%
40%
SSR
Z
V
SSR'
V
D
≤V
Equation (1)
D
0
Equation (2)
Cycle time
Cycle time
to V
)
SSR/MIN
SSR/MAX
7-33
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