IDEC MicroSmart Pentra - Manual (Page 111)

C ONFIGURING PID M ODULE USING W IND LDR
6-46 FC5A MicroSmart PID Module User’s Manual FC9Y-B1283
(2) Control Register+30: Control Period
The control period determines the duration of the ON/OFF cycle of the control output that is turned on and off
according to the output manipulated variable (MV) calculated by the PID control action. The ON pulse duration
of the control output is determined by the product of the control period and the output manipulated variable
(MV).
When the heating/cooling control is enabled, the control period will be the heating control period. When the
output type is current, the control period is disabled.
Example: When the control period is 5 sec:
(3) Control Register+46: Output Manipulated Variable Upper Limit
This value specifies the upper limit of the output manipulated variable (MV). The output manipulated variable
upper limit is used to suppress the output manipulated variable (MV).
Example:
When the output manipulated variable (MV) upper limit is 80%, the control output will be 80% even when the
output manipulated variable (MV) reaches 100%.
(4) Control Register+47: Output Manipulated Variable Lower Limit
This value specifies the lower limit of the output manipulated variable (MV).
Example:
When the output manipulated variable (MV) lower limit is 20%, the control output will be 20% even when the
output manipulated variable (MV) is 0%.
(5) Control Register+49: Cooling Control Period
When the heating/cooling control is enabled, the cooling control period determines the duration of the ON/OFF
cycle of the cooling control output that is turned on and off according to the cooling output manipulated variable
(MV) calculated by the PID control action.
(6) Control Register+51: Cooling Output Manipulated Variable Upper Limit
This value specifies the upper limit of the cooling output manipulated variable (MV). The cooling output
manipulated variable upper limit is used to suppress the cooling output manipulated variable (MV).
Example:
When the cooling output manipulated variable (MV) upper limit is 80%, the cooling control output will be 80%
even when the cooling output manipulated variable (MV) reaches 100%.
(7) Control Register+52: Cooling Output Manipulated Variable Lower Limit
This value specifies the lower limit of the cooling output manipulated variable (MV).
Example:
When the cooling output manipulated variable (MV) lower limit is 20%, the cooling control output will be 20%
even when the cooling output manipulated variable (MV) is 0%.
OFF OFF OFF OFF
5 sec 5 sec 5 sec
Control Output
Output Manipulated
Variable (MV) 80%
ON (4sec) ON (3 sec) ON (2.5sec) ON
Output Manipulated
Variable (MV) 60%
Output Manipulated
Variable (MV) 50%