IDEC MicroSmart Pentra - Manual (Page 149)

A PPENDIX
9-2 FC5A MicroSmart PID Module User’s Manual FC9Y-B1283
Loop Break Alarm
A trouble of the actuator, such as heater break or heater adhesion, can be detected
as the loop break alarm.
For details about the loop break alarm, see page 6-39.
Loop break alarm
time 0 to 200 minutes
Loop break alarm
span When input is thermocouple or resistance thermometer:
0 to 150°C (°F) or 0.0 to 150.0°C (°F)
When input is voltage/current:
0 to 1500
Output Bit 2 of the operating status
Set Point (SP) Ramp
Function
When the set point (SP) is changed, the set point (SP) is gradually increased from the
original set point (SP) to the new set point (SP) according to the configured
rate-of-change (°C/minute, °F/minute).
When the control is started, the set point (SP) is increased from the current process
variable (PV) to the configured set point (SP) according to the configured
rate-of-change (°C/minute, °F/minute).
Auto/Manual Mode
Switching
Auto or manual mode can be switched.
When the control mode is switched from auto to manual mode and vice versa, the
balanceless-bumpless function works to prevent a sudden change in output
manipulated variable (MV).
When the power is turned on, the operation parameters in Block 1 are retained, so
the control action starts with the previous mode at the time of power off.
Cascade Control
The cascade control is an advanced control that uses 2 inputs [CH1 as a master
(primary control) and CH0 as a slave (secondary control)] to control one process.
The output manipulated variable (MV) calculated according to the process variable
(PV) and the set point (SP) of the master (CH1) is used as the set point (SP) of the
slave (CH0) for control. The control results will be outputted from the output CH0.
Heating/Cooling
Control
Output (CH0 only)
When it is difficult to control the target process with heating control only, cooling
control can be added to perform the heating/cooling control.
Cooling
proportional band 0.0 to 10.0 times. Cooling proportional band is the
product of this value and the heating proportional band.
The cooling control becomes ON/OFF control when the
cooling proportional band is 0.
Integral time (I) 0 to 10000 seconds
Derivative time (D) 0 to 10000 seconds
Cooling control
period
1 to 120 sec
Overlap/Dead
band When input is thermocouple/RTD: -200.0 to 200.0°C (°F)
When input is voltage/current: -2000 to 2000
Cooling output
ON/OFF hysteresis
When input is thermocouple/RTD: 0.1 to 100.0°C (°F)
When input is voltage/current input: 1 to 1000
Cooling output
manipulated
variable (MV)
upper limit,
lower limit When output type is voltage:
Upper limit: Cooling output manipulated variable lower
limit to 100%
Lower limit: 0% to cooling output manipulated variable
upper limit
When output type is current:
Upper limit: Cooling output manipulated variable lower
limit to 105%
Lower limit: -5% to cooling output manipulated variable
upper limit
Cooling method Air cooling (Linear characteristic),
Oil cooling (1.5th power of the linear characteristic), or
Water cooling (2nd power of the linear characteristic)
Cooling output CH1 output.
External SP Input
The input value of input CH1 is used as the set point (SP) of CH0 control.
When the external SP input bias is configured, it is added to the set point (SP) of
CH0 control. The input types that can be selected are shown in the following table.
Input type Current: 4 to 20mA or 0 to 20mA
Voltage: 1 to 5V or 0 to 1V
Allowable input Current: 50mA DC maximum
Voltage (0 to 1V): 5V DC maximum
Voltage (1 to 5V): 10V DC maximum
Input impedance Current: 50Ω
Voltage: 100kΩ