PID Controller Model No. NICD2411

Introduction

This is a micro-controller based PID Controller Cum Process Controller. The instrument has three modes: PID mode, retransmission mode (2nd), and Manual mode (3rd). In retransmission mode, the user can select any mode, and if the 2nd mode (Retransmission mode) is selected, the instrument can provide a 4-20mA output according to the input. In the 3rd mode, the user can manually take a 4-20mA output via the keypad. The upper display shows the process value, and the lower display shows the output value/set point. The instrument features Modbus (RS485) Communication and 2 Relay control.

Foreword

Thank you for purchasing the PID/Process Indicator Controller NICD2411. This manual describes the basic functions and operation methods of the NICD2411. Please read through this user's manual carefully before using the product.

Operation

Before Connecting Power Supply

Ensure that the I/P voltage is connected to the right terminals. Upon application of proper power supply and input sensor, the instrument will display the Control / Set Point value in the lower display and the Process Value in the upper display.

Key Operation

Pressing the PRG key enters Configuration mode.

By pressing the UP /DN keys, the value can be changed, and pressing the Ent key stores the modified value.

Relay Operation

Relay: The relay is OFF when the Flow is less than the Set value & ON when the Flow is more than the Set value, and vice-versa.

Model & Inputs

Input Resistance

250Ω 1% External for Current Input

Wiring and Terminals

A diagram illustrates the input and pulse input terminals. Terminal +10 and -11 are designated for input. Terminals (-v)12, (+v)13, and (i/p)14 are for Pulse Input. A separate line shows 0-5V / 1-5V / 0-10V input connected to terminals +10 and -11. A flow sensor is depicted connected to these terminals.

The diagram also indicates "250Ω, 1% for Current Input (0-20/4-20mA)".

Terminal Details

• 1: P (phase) 220VAC @50HZ
• 2: N (Neutral)
• 3: E (Earth)
• 15: D+ (RS485 COMMUNICATION)
• 16: D- (RS485 COMMUNICATION)
• 17: - mA (o/p Isolated 4-20mA)
• 18: + mA (o/p Isolated 4-20mA, Positive)
• 13: +24VDC (for Loop power)
• 12: - 24VDC (for Loop Power)
• 14: pulse input (For K factor flow)
• 9: NC2 (Relay RL2, NC terminal)
• 7: C2 (Common Terminal of RL2)
• 8: NO2 (Relay RL2, NO Terminal Of Relay 2)
• 6: NC1 (Relay RL1, NC terminal)
• 4: C1 (Common Terminal of RL1)
• 5: NO1 (Relay RL1, NO Terminal Of Relay 1)
• 10: + input terminal (0-5/1-5/0-10v/0-20mA/4-20mA)
• 11: - input terminal (0-5/1-5/0-10v/0-20mA/4-20mA)

Specifications

• Main (auxiliary supply): 220vAC @50Hz / 24 VDC/15V DC
• PV Display value: -199 to 9999
• SV Display Value: -199 to 9999
• Output (Analog): 4-20mA isolated (optical)
• Control Relay: One pair normally open potential free contact: @ 5A at 240v AC
• I/P: 0-20mA/4-20mA/0-5VDC/1-5vDC/0-10VDC/Frequency
• Operating temp.: 0°C to 50°C
• Overall size: 96x96x65 mm (HWD)
• Panel Cutout: 92x92 mm (WxH)

Parameters

• Inpt: Select type of input.
• Actn: Select action (Forward/reverse for PID/Process Indication).
• Type: Select instrument Mode (PID/retransmission/manual).
• DP: Select decimal point.
• rSid: Modbus Communication ID Address (1-255).
• SPnL: Span Low Range (value displayed on low input signal, e.g., -199 to 9999).
• SPnH: Span High Range of PV (value displayed on high input signal, e.g., -199 to 9999).
• diSP: Select whether to show the Set point value (SEtP) or the control output value (outP) on the SV display.
• rL1: Relay 1 Set point.
• rL2: Relay 2 Set point.
• His1: Hysteresis 1 for relay 1 set point (turns off relay1 if display value is lower than this).
• His2: Hysteresis 2 for relay 2 set point (turns off relay2 if display value is lower than this).
• SP--: Set value of PID set point.
• dEtd: Set Derivative value of PID Control (0-3000).
• Intr: Set Integral value of PID Control (0-3000).
• Pd--: Set Proportional gain value of PID Control (0-999.0).
• dbnd: Set dead band % value of Set point (dead band = set point x dbnd%).
• Pdly: Set value of PID sample delay time (1 = 1MS).
• Fine: Adjust fine tuning of process value.
• Factor: Adjust K factor.
• Exit: Exit from programming mode.

How to Select Parameters

Press the Prg key for 3 seconds to display the 'inpts' parameter. Select any input and press the E key for the next parameter. Use the up/dn keys to navigate through parameters. Pressing the E key exits the parameter selection.

PID Control Mode

In this mode, the following parameters are used:

1. Type = PID
2. pdly = PID delay time (1 value = 1MS)
3. Action parameter for PID action forward/reverse mode
4. SP-- = PID set point
5. dEtd = Derivative value of PID Control action (slow/fast, 0-3000)
6. Intr = Integral value of PID Control (0-3000)
7. Pd-- = Proportional gain value of PID Set point (0-999.0)
8. dbnd = Dead band % value of Set point (dead band = set point x dbnd%)

For fast action of PID control:

Increase integral value & decrease derivative value and adjust the value of proportional gain.

For slow action of PID Control:

Adjust (increase) derivative value & decrease integral value and adjust proportional gain & derivative value.

dbnd:

This parameter defines the percentage higher and lower side of the set point. When the PID reaches the process value around the set point, the dead band comes into action. If the process value is within this limit, there will be no action on the control. If the process value exceeds the dead band value, the PID controls action will take place; otherwise, no action will be taken due to being in the dead band.

SP--:

In running mode, press upkey + Prgkey to display the set point. Press Ekey and set the desired value using up/dn keys, then press Ekey.

Auto/Manual Mode:

First, hold down the enter key and then press the prg key. The instrument will automatically switch between manual and auto mode. If it was in AUTO mode, it will go to manual mode, and if it was in manual mode, it will go to AUTO mode.

Auto/Manual:

By pressing and releasing the enter key, the user can check whether the instrument is in auto mode or manual mode.

Process Indicator cum Controller (Mode2)

In this mode, the instrument can be used as a process indicator/controller and provide a 4-20mA retransmission output.

Configuration for retransmission mode involves selecting the 'type' parameter and pressing the E key to set it to 'rEts'.

A simple flowchart shows: Select parameter 'type' -> Press Ekey -> set 'rEts' -> Now Configure in retransmission mode.

K-factor

This K-factor is given in terms of the number of pulses produced by the sensor/meter for a given volumetric flow (e.g., 150 pulses per liter). This K-factor is the value entered into a batch meter or indicator/totalizer to provide readings in engineering units.

Example 1:

If the display on a flow rate meter is required in U.S. gallons per second, and the K-factor of the flow meter is 210 pulses per U.S. gallon, then the K-factor entered into the rate meter would be 210. If a totalizer associated with the same flow meter was to be set up for flow rate in U.S. gallons, the indicator K-factor would be 210. If the indicator was to be set for flow rate in tenths of a gallon, the K-factor would be 210 / 10 = 21.

Note:

If the user needs to show flow value in tenths of a gallon/Liter, set the K factor value to 21 in the factor parameter and the k_decimal point to zero. If the user needs to show flow value in ones, set the value to 210 in the factor parameter and k_decimal to 0.

Note-For K-factor

Press the Prg key to display the input parameter, then press E key. Select pulse input using the up(+)/dn(+) keys. After selection, press Ekey. The display will show 'inpt' again. Use the up key to select the next parameter. Press Ekey for the 'Fctr(kfactor)' parameter. The last loaded value of k_factor will be displayed. To change the value, use the up/Dn keys according to your k_factor value (e.g., 225/22.5). Press and hold the Prgkey for 1 second, then press E key. Release both keys. The display will show dP (Decimal Point). Press Ekey to set the decimal point according to your k_factor value and press Ekey. The display will show Fctr again, indicating the K-factor value has been stored.

Example:

If 225 pulses = 1 liter/minute flow, and the user needs to show flow value in tenths of a Liter, then 225 / 10 = 22.5.

Set the 1st k_factor value (225) in the factor parameter using up/dn keys. Press and hold the Prgkey for 1 second, then press Ekey and release both keys. The DP parameter will appear on the display. Press Ekey and set the position of the decimal point using up/Dnkey and press Ekey.

A diagram shows "22.5" with an arrow pointing to it.

Communication

Modbus RTU Serial

• PROTOCOL: Modbus RTU serial
• STANDARD: RS-485
• BOUDA RATE: 9600 BPS
• DATA BIT: 8 BITS
• STOP BIT: 1
• PARTY: NONE
• MODBUS ID ADDRESS: 1-255

The unit can be connected in RS-485 communication data link either in multi-drop or repeat mode. Each unit must have a unique Serial Number. The entire range of addresses (1 to 255) may be used. Before starting any communication, choose a baud rate compatible with the host computer. The serial protocol used is MODBUS RTU.

Read Holding registers FUNCTION = 03

Modbus Registers

Master Query: [id] [Function Code][High Addr. Byte][Low addr. Byte][No of Points High][No. of point low][CRCL][CRCH]

Slave Response: [id] [Function Code][ Byte Count.][Data High][Data Low ] [CRCL][CRCH]

Master Query: [id] ]Function Code][High Addr. Byte][Low Addr. Byte][No of Points High][No. of point low][CRCL][CRCH]

Calibration

Press and hold Dnkey + Prgkey for 5 seconds to display "Zero". Apply 0mA at input terminal (+10 & -11), then press E key. The display will show ADC value counts. Wait for 3 seconds, then press and hold Prgkey. After 1 second, press E key and release both keys. The display will show CALL (Low calibration). Apply 4mA at input terminal (+10 & -11), then press Ekey. The display will show ADC counts. Wait for 5 seconds, then press and hold Prgkey. After 1 second, press E key and release both keys. The display will show CALH (High Calibration). Apply 20mA at input terminal (+10 & -11), then press E key. The display will show ADC counts. Wait for 5 seconds, then press and hold Prgkey. After 1 second, press E key. Calibration is now complete. Note: After calibration, SPANL/SPANH must be redefined.

Faults/Errors

Err1:

If the instrument is showing error1, then the internal data of the instrument has been corrupted. The default value needs to be loaded in internal memory through the following process. Switch off the instrument's power. Then press and hold Dnkey + Upkey. Switch the instrument back on. After 10 seconds, release both keys. Now the instrument must be reconfigured and recalibrated.

-Err:

If the instrument is showing -Err, it means the input terminal connection is reversed. So please change the input terminal connection (+10 / -11).

Open:

Input terminal wire disconnected or input source has been faulted.

Undr:

Input value is low (below 4mA/1VDC).

Over:

Input is higher than the defined range setting.