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Setting Output Specifications Section 3-4
3-4 Setting Output Specifications
3-4-1 Control Period
• Set the output period (control period). Though a shorter period provides
better control performance, we recommend setting the control period to
20 seconds or more when using a relay output for heater control (to
increase the effective life of the relay). If necessary, readjust the control
period according to the results of trial operation with the control period
parameters set to their defaults.
• Use host communications or the E5ZN-SDL Setting Display Unit to set
the “heating control period” and “cooling control period” parameters.
Default is 2 s.
• The “cooling control period” parameter is used only in heating and cooling
control.
• Set the control periods for channels 1 and 2 separately.
3-4-2 Direct (Cooling)/Reverse (Heating) Operation
• Direct operation refers to control where the manipulated variable (MV) is
increased for an increase in the PV (e.g.,cooling). Alternatively, reverse
operation refers to control where the manipulated variable (MV) is
decreased for an increase in the PV (e.g., heating).
• For example, when the PV (temperature) is lower than the SP (tempera-
ture) in a heating control system, the manipulated variable (MV) increases
by the difference between the PV and the set value.
Reverse operation is thus used in a heating control system and direct
operation is used in a cooling control system.
• Use host communications or the E5ZN-SDL Setting Display Unit to set
“Direct/reverse operation” to “0: Reverse” or “1: Direct.” Default is for
reverse operation (heating).
• Set the direct/reverse operation for channels 1 and 2 separately.
MV MV
Low temperature Set value High temperature Low temperature Set value High temperature
Direct operation Reverse operation
100%
0%
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0%
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