Special Features FDC DIN Controls:


Setpoint Ramp or Soft Start Ramp

Setpoint Ramp or Soft Start Ramp: [applicable to B, C, 90, 100, 200, 300 & P Series Controls]

The ramping function, if configured, is performed during power up as well as any time the set point is changed.  During power up or when a setpoint change occurs the internal setpoint will ramp from the current PV to the SP in the configured time ramp.

When the ramp function is used the lower display will show the current ramping value. However it will revert to show the set point value as soon as the up or down key is touched for adjustment. The ramping value is initiated to process value either power up or RAMP and /or set point are changed. Setting RAMP to zero means no ramp function at all.

This function may be configured in the following time units shown below:

  • Degrees per minute: 90 & 200 Series Controls
  • Degrees per minute or per hour: C, 100, 300 & P Series Controls

Setpoint Ramp Rate Graphic

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Dwell Timer

Dwell Timer Alarm: [applicable to B, C, 90, 100, 200, 300 & P Series Controls]

One alarm may be configured as a dwell timer alarm. Once configured the dwell time is measured in minutes - the maximum number of minutes vary by control series with the longest being the 300 Series at 6,553 minutes.

 

Once the process reaches setpoint the dwell timers starts to count down from zero until time out. The dwell timer alarm relay will remain unchanged until time out. The dwell timer is reset by power up sequence.

[Note: The 300 Series event input may be configured to reset the dwell timer]

Dwell Timer graphic

 

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Selection of 2nd Setpoint and/or PID variables - 300 & P Series only

A 2nd Setpoint and/or PID variables may be selected using the event input available in the 300 Series Controls.  With the event input configured to change SP, PID or SP & PID, a dry contact signal applied to the event input terminals will drive the appropriate change.

The contact closure may come from external device or from an alarm input from the 300 Series Control. Examples with input coming from 300 Series Control:

PID controls with multiple PID setsPID #1 PID #2

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Setpoint Ramp / Soak with Dwell

Setpoint Ramp / Soak with Dwell Timer: [applicable to B, C, 90, 100, 200, & 300 Series Controls]

When controls are configured for Setpoint Ramp and an alarm as Dwell Timer a one Setpoint Ramp & Soak feature is available. When the control is powered the SP will ramp from existing PV at the configured rate to the control SP. Once SP is achieved the dwell timer will start its' countdown. When the dwell time is achieved the alarm relay will activate and if so wired to shut the system down or alert operator dwell (Soak) time is completed.

Two Setpoint Ramps with one Dwell Time: [applicable to 300 Series only] Click here for more information on the Series 300 Special Features.

The 300 Series controls with event input configured to change SP offers ability to have a 2nd SP Ramp. PID variables may also be changed when switching to SP2. See above Selection of 2nd Setpoint and/or PID Variables.

setpoint ramp with soak dwell timer

Above shows 300 Series using Dwell Timer alarm to switch to 2nd SP

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Remote Setpoint - 300 Series only

The 300 Series control platform has 3 inputs, two of which may be configured to accept a Remote Setpoint input:

Remote Setpoint Input: Input #1 and #2 can be configured to accept linear mA/VDC input as the PV or as a Remote Setpoint. When configured as a Remote Setpoint the other input is the PV input.

The Event input [input #3] may be configured to switch between local & remote setpoint.

Example Application - Multizone Oven: One 300 Series control [master] retransmits its' setpoint to other 300 Series controls [slaves] insuring each zone control has the same setpoint.

Note: When the SP ramp function is used, the lower display will show the current ramping value. However it will revert to show the set point value whether it is manual enter SP or Remote SP as soon as the up or down key is touched for adjustment. The ramping value is initiated to process value either power up or RAMP and /or set point are changed. Setting RAMP to zero means no ramp function at all.

Click here for more information on the Series 300 Special Features.

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Auto/Manual [Hand Control]

Auto/Manual [Hand Control]: [applicable to B, C, 90, 100, 200, 300 & P Series Controls] 

Auto Control is when the controller manipulates the output(s) to achieve and maintain set point.

Manual control of the outputs is allowed through the front keypad. An operator may desire to manually control the outputs for a variety of reasons. When the operator transfers from  Auto to Manual control the transfer is Bumpless - that is if the control output was at 30% it remains at 30% when transferred to Manual mode. The same Bumpless output occurs when transferring from Manual to Auto.

While in manual control the upper display shows output #1 with the lower display showing output #2.

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Sensor or other Failure - Configurable Output: - 300 Series only 

  • Bumpless Transfer of Proportional Outputs
  • Configurable Proportional Output to a default value 0 - 100%

Bumpless Transfer with Sensor or other control Failure: [applicable to B, C, 100, 300 & P Series]

Upon Sensor or other control Failure the Proportional Outputs can be configured to provide a Bumpless Transfer of the current proportional output.

PID control bumpless transfer disabledPID control bumpless transfer

With the Bumpless Transfer configured and the process load does not change the process can continue to be controlled temporarily as if the sensor is normal. However, once the load changes the process may run away. Therefore you should not rely on bumpless transfer for any extended period of time. For fail safe reason an additional alarm should be used to annunciate a system or sensor failure.

Control Outputs configured to a default output 0 - 100%: [applicable to C, 90, 200, 200, 300 & P Series Controls]

Upon Sensor or other control Failure the Proportional Outputs can be configured to default a configurable percent output ranging from 0% to 100%. Output #1 when set as an on-off control can be configured to be open or closed.

Note: Outputs configured as alarms are configurable to open or close on control failure. This feature is described in Alarm Logic page.

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Read Minimum and Maximum PV Values & Current CJC Value

Read Minimum & Maximum PV Values: [applicable to L, 200 & 300 Series Controls]

The Historical Minimum & Maximum PV values are stored and are viewable in these controls. These values may  be reset allowing new values to be stored.

Cold Junction Compensation [CJC] Temperature Value: [applicable to 300 Series Control only]

The CJC is used with thermocouple [t/c] inputs to measure the ambient temperature where the t/c's connect to the control and may be viewed at any time. The CJC value is not used by the control when configured for RTD or Linear mA/VDC inputs but may still be viewed. As the CJC value represents the temperature at the control's terminal block [slightly higher than ambient due to heat generated by controller operation] the CJC value may be of interest if the temperature of the panel box the control is mounted is of interest.

Via RS485/232 Modbus - Read Historical Minimum & Maximum PV Values and CJC Temperatures: [applicable to C, L, 100, 300 & P Series Controls.

The subject values have Modbus addresses and can be read via RS232/485 communications.

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Event Input - 300 Series Controls

The Event Input is the 300 Series Control's 3rd input. It may be configured for multiple functions described below.

  • Change SP from SP1 to pre configured SP2
  • Change PID values to pre configured PID2
  • Change SP & PID values to pre configured SP2 & PID2
  • Change from local to Remote Setpoint
  • Reset all or specific alarms configured as latching
  • Disable Output #1, Output #2 or both Output #1 & #2.
  • Lock all parameters from being changed - can view all parameters but no operator changes. The Lock parameter does not apply to RS232/485 Modbus.

Click here for more information on the Series 300 Special Features.

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Configure Display and Control Functions for Input #1 & Input #2 and other display options - 300 Series Controls only

The Process Variable in the 300 Series Controls [300 Series has two analog & one event input] is configurable as one of the following:

  • PV1 [Input #1]
  • PV2 [Input #2]
  • PV1-PV2
  • PV2-PV1

The default display will show the Process Variable as configured above.

The Display Mode for the 300 Series also allows operator viewing of the following:

  • Process Variable [defined above], Input #1, Input #2, Historical Minimum & Maximum for Input #1 & #2, % output for Output #1 and #2, Deviation between SP & PV, Input #1, Input #2, PID values, CJC Temperature value,

Click here for more information on the Series 300 Special Features.

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Differential & Cascade Control Logic - 300 Series only

Differential Control: In certain applications it is desirable to control a second process such that its process value always deviates from the first process with a constant value.

PID Differential Control Graphic

 The 300 Series allows the Control & Display to be configured independently as PV #1, PV #2,  PV1-PV2 or PV2-PVI.  For Differential Control Configure the appropriate PV's as PV1 & PV2, configure control as either PV1-PV2 or PV2-PV1 and the control output will function to maintain set differential between the two. The PV display is configured separately from the control and can be set at PV1, PV2, PV1-PV2 or PV2-PV1. Cascade Control- The output of control #1 becomes control #2 SP. Cascade Control requires two controls. Control #1 has retransmission option configured as to retransmit output #1 % Output. Control #2 accepts Control #1 retransmitted output as its' Remote Setpoint.

 

Click here for more information on the Series 300 Special Features.

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Event Input - P Series & B42 Profile Ramp-Soak Controls

The P Series Profile Ramp/Soak Controls have their own Features Section - click here for P Series Special Features. A brief summary is shown below finishing with Event Input Feature:

The P Series Profile Ramp/Soak Controls are available as 1/16 and 1/4 DIN. They offer:

  • Recipe/Programs: 9 programs of up to 64 segments per program. Configurable functions include:
    • Time Base for Ramp, Time Base for Soak, Segment Jump, Segment Repeat, Guaranteed Soak, Configurable Power Interruption Recovery and more.
  • Outputs: up to 4 control outputs [Output #1 is always control output with remaining outputs configurable as control (output 2 only), alarm or events] plus communications [RS323/485 Modbus or Retransmission]. Output 2, 3 & 4 can also be specified as  isolated transmitter power supplies.
  •  Inputs:
    • Universal thermocouple, RTD and linear mA/VDC may be specified
    • Event Input Configurable to:
      • None
      • Program Run
      • Program Hold
      • Program Abort
      • Jump to next Segment.
      • Select 2nd set of PID parameters
      • Manual Mode

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Return to:

Process & Temperature Control Page.htm

90 Series.htm

300 Series.htm

100/C Series.htm

B Series.htm (board level control)

Limit Controls.htm

P Series Profile Controls.htm

 

Future Design Controls   888.751.5444 csr@futuredesigncontrols.com