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7-40
Chapter 7. PARAMETER SETUP
●
C72 (cold junction compensation)
0: Compensated internally
1: Compensated externally
• This selects how thermocouple cold junctions are to be compensated.
• When set to 1, carry out 0°C compensation by an ice box, for example.
●
C74 (voltage time-proportional output system)
0: Input ON again enabled within time-proportional cycle
1: Input ON again disabled within time-proportional cycle
• This selects whether or not to turn output ON again even if output is OFF when
the results of PID operation have changed during the time-proportional cycle
(cycle time).
• The figure below shows each of these differences.
●
C78 (voltage output 1 adjustment)
●
C79 (voltage output 2 adjustment)
●
C80 (voltage output 3 adjustment)
When driving an SSR by voltage time-proportional output, the output voltage of
the DCP32 must be within the input rated voltage (optimum ignition voltage) of
the SSR.
On the DCP32, 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 and outputs the optimum current value on the DCP32 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.
Setting = 0
20%
50%
40%
20%
→
→
→
→
50%
40%
OFF
ON
PID operation result
Cycle time
Cycle time
OFF
ON
PID operation result
Setting = 1
Cycle time
Cycle time