NOVUS N322 Temperature Controller User Manual

TEMPERATURE CONTROLLER
N322
OPERATING MANUAL
V1.8x K

The N321 is a temperature controller for heating and cooling applications. It is available with an NTC thermistor input sensor, Pt100, Pt1000, or J/K/T type thermocouple. Sensor offset correction is provided. The output can be used as a control or alarm.
The features of a particular model (input sensor type, sensor range, mains supply, etc) are identified by the label placed on the controller body.

INPUT SENSOR: The sensor is chosen by the user at the time of purchase and is presented on the upper side of the equipment box. The options are:

• Thermistor NTC, 10 kΩ 25 °C; Range: -50 to 120 °C (-58 to 248 °F); Accuracy: 0.6 °C (1.1°F);
  The maximum error in the interchangeability of original NTC sensors: 0.75 °C (1.35 °F). This error can be eliminated through the offset parameter of the controller.
  Note: For the NTC thermistor option, the sensor comes with the equipment. Its operating range is limited to -30 to +105 °C (-222 to +221 °F). It has a cable of 3 meters in length, 2 x 0.5 mm², and can be extended up to 200 meters.
• Pt100; Range: -50 to 300 °C (-58 to 572 °F); α = 0,00385; 3 wires; Accuracy: 0.7 °C (1.3 °F); according to IEC-751 standards;
• Pt1000; Range: -200 to 530 °C (-328 to 986 ºF); α = 0,00385; 3 wires; Accuracy: 0.7 °C (1.3 °F);
• Thermocouple type J; Range: 0 to 600 °C (32 to 1112 °F); Accuracy: 3 °C (5.4 °F);
• Thermocouple type K; Range -50 to 120 °C (-58 to 248 °F); Accuracy: 3 °C (5.4 °F);
• Thermocouple type T; Range: -50 to 120 °C (-58 to 248 °F); Accuracy: 3 °C (5.4 °F);
• Thermocouples according to IEC-584 standards.

Measurement resolution:
From -19.9 to 199.9 º with NTC and Pt100: ………………………………………………… 0.1
Elsewhere: …………………………………………………………………………………………………… 1
Note: The equipment keeps its precision all over the range, despite the lack of display
resolution in a part of the range does not allow its visualization.
OUTPUT1: ……………….. Relay SPDT; 1 HP 250 Vac / 1/3 HP 125 Vac (16 A Resistive)
Optionally: ……………………………………………………………….. Pulse, 5 Vdc, 25 mA max.
OUTPUT2: ………………………………………………………………… Relay: 3 A / 250 Vac, SPST
POWER SUPPLY: ………………….. 100~240 Vac (± 10 %) or 24 Vdc/ac (12~30 Vdc/ac)
…………………………………………. Mains frequency: 50~60 Hz. Power consumption: 5 VA
DIMENSIONS: ………………………………………… Width x Height x Depth: 75 x 33 x 75 mm
…………………………………………………………….. Panel cut-out: 70 x 29 mm; Weight: 100 g
ENVIRONMENT: …………………………. Operating temperature: 0 to 40 °C (32 to 104 °F)
…………………………………………………… Storage temperature: -20 to 60 °C (-4 to 140 °F)
………………………………………………………………………….Relative humidity: 20 to 85 % RH

Housing: Polycarbonate UL94 V-2.
Protection: Front panel: IP65, Box: IP42.
Suitable wiring: Up to 4.0 mm².
RS-485 digital communication; RTU MODBUS protocol (optional).
Serial interface not isolated from input circuitry.
Serial interface isolated from input circuitry, except in 24 V powered model.

ELECTRICAL WIRING

Fig. 1 below shows the controller connections to the sensor, mains, and outputs.

Pt100 with 3 conductors: Terminals 11, 12, and 13 must have the same wire resistance for proper cable length compensation. For 2 wire Pt100, short circuit terminals 11 and 13.

Recommendations for the Installation

• Temperature sensor drivers must go through the plant separate system for drivers of control output and power supply if possible electrodes terrified.
• The controller’s power should come preferably from a campus network for instrumentation or different from that used by phase control output.
•  Installing RC filters (47 R and 100 nF, series combination) is strongly recommended at contactor coils or any other inductors.

OPERATION

The controller requires the internal parameters to be configured according to the intended use for the instrument. The parameters are organized in 4 groups or levels:

Upon power-up, the N321 display shows for 1 second its firmware version. This information is useful when consulting the factory.
Then, the temperature measured by the sensor is shown on the display. This is parameter level 0 (temperature measurement level).
To access level 1, press for 1 second until the message shows up. Pressing again to go back to level 0.
To access level 2 of parameters, press for 2 seconds until the message is shown. Release the key to remain at this level. Each new pressing on the key will advance to the next parameter in the level. At the  end of the level, the controller returns to the first level (0). Use the and keys to alter a parameter value.
Notes:

1. A parameter configuration is saved when thekey is pressed to advance to the next parameter in the cycle. The configuration is stored in non-volatile memory, retaining its value when the controller is de-energized.
2. If no keyboard activity is detected for over 20 seconds, the controller saves the current parameter value and returns to the measurement level.

Level 1 – Setpoint Adjustment 

In this level only the Setpoint (SP) parameter is available, alternating the name with its respective value. Adjust the desired temperature for setpoint by clicking on the and keys.

Temperature adjustment for control OUTPUT 1. SP value is limited to the values programmed in and SPk in the programming level (Parameter configuration, level 2).

Level 2 – Configuration – Parameters configuration Level

Contains the configuration parameters to be defined by the user, according to the system’s requirements. Use and keys to set the value. The display alternates the parameter name and respective value.

	Temperature Unit – Selects display indication for degrees Celsius or Fahrenheit. 0 – Temperature in degrees Celsius 1 – Temperature in degrees Fahrenheit
	Input Type – Selects the input sensor type to be connected to the controller. Available only for thermocouple models, allowing selection of types J, K, and T. 0  Thermocouple J 1 Thermocouple K 2 Thermocouple T
	Sensor Offset – Offset value to be added to the measured temperature to compensate for sensor error.
	SP Low Limit – Lower range for must be programmed with a lower value than.
	SP High Limit – Upper range for  must be greater than
	OUTPUT 1 Hysteresis: defines the differential range between the temperature value at which the OUTPUT 1 is turned on and the value at which it is turned off. In degrees.
	Control action for OUTPUT 1 :0 Reverse: For heating applications. Outputs turn on when the temperature is lower than SP. 1 Direct: For cooling applications. The output turns on when the temperature is above SP.
	Off time – Defines the minimum of time for control OUTPUT 1. Once OUTPUT 1 is turned off, it remains so for at least the time programmed in . For thermocouple inputs, this parameter is not available. This parameter is intended for refrigeration systems where longer compressor life is desired. For heating systems, a program to zero. Value in seconds, 0 to 999 s.
	On-time – Defines the minimum on time for control OUTPUT 1. Once turned on, OUTPUT 1 remains so for at least the time programmed in. For thermocouple inputs, this parameter is not available. This parameter is intended for refrigeration systems where increased compressor life is desired. For heating systems, a program to zero. Value in seconds, 0 to 999 s.
	Delay time to start control. Upon power-on, control OUTPUT 1 is kept off until the time programmed in is elapsed. Its usage is intended to prevent multiple compressors to start simultaneously after the turn-on of a system with several controllers. Value in seconds, 0 to 250 s.

Level 3 – Calibration level

The controller inputs are factory calibrated and recalibration should only be done by qualified personnel. If you are not familiar with these procedures do not attempt to calibrate this.
Press the key for 3 seconds to access this level. This level contains also the
parameters for configuration the protection.
If you have entered this level accidentally, go through all the parameters without making any changes until the controller returns to the measurement level.

	Password – Enter the correct password to unlock write operations for the parameters in the following levels.
	Calibration low – Offset value of the input. It adjusts the lower measurement range of the sensor.
	Calibration High–  Gain calibration. It adjusts the upper measurement range of the sensor.
	Cold Junction Offset calibration – This parameter is available only for thermocouples.
	Factory Calibration – Restores factory calibration parameters. Change from 0 to 1 to restore the calibration parameters with factory values.
	Protection  – Defines the levels of parameters that will be password protected. See “Configuration Protection” for details.
	Password Change – Allows changing the current password to a new one. Values from 1 to 999 are allowed.
	Serial number – First part of the controller electronic serial number.
	Serial number – Second part of the controller electronic serial number.
	Serial number – Third part of the controller electronic serial number.

WORKING WITH THE CONTROLLER

The N321 energizes the output relay such as to maintain the process temperature on the setpoint value defined by the user. The output status led P1 signals when the control output is on.

CONFIGURATION PROTECTION

A protection system to avoid unwanted changes to the controller parameters is implemented. The level of protection can be selected from partial to full. The following parameters are part of the protection system:

 When this parameter is presented, the correct password should be entered to allow changes of parameters in the following levels.

 Defines the level of parameters that will be password protected:
1- Only calibration level is protected (factory configuration);
2- Calibration and Configuration levels are protected;
3- All levels are protected – calibration, Configuration, and setpoints.

 Parameter for the definition of a new password. Since it is located in the calibration level, can only be changed by a user that knows the current password. Valid passwords are in the range of 1 to 999.

Configuration protection usage
 the parameter is displayed before entering a protected level. If the correct password is entered, parameters in all following levels can be changed. If a wrong or no password is entered, parameters in the following levels will be read-only.

Important notes:

1. After five consecutive attempts to enter the wrong password, the new tentative will be blocked for the next 10 minutes. If the current valid password is unknown, the master password can be used only to define a new password for the controller.
2. The factory default password is 111.

MASTER PASSWORD

The master password allows the user to define a new password for the controller, even if the current password is unknown. The master password is based on the a serial number of the controller, and calculated as follows: [ 1 ] + [ higher digit of SN2 ] + [ higher digit of SN1 ] + [ higher digit of SN0 ] For example, the master password for the device with serial number 97123465 is: 1 9 3 6
As follows: 1 + = 97; = 123; = 465 = 1 + 9 + 3 + 6

How to use the master password:

1. Enter the master password value at prompt.
2. Go to the parameter and enter the new password, which must not be zero (0).
3. Now you can use this new password to access all controller parameters with modified rights.

ERROR MESSAGES

Sensor measurement errors force the controller outputs to be turned off. The cause for these errors may have origin in a bad connection, sensor defect (cable or element), or system temperature outside the sensor working range. The display signs related to measurement errors are shown below:

	• Measured temperature exceeded the maximum allowed range for the sensor. • Broken Pt1000 or T/C. • Short circuited NTC sensor.
	• Measured temperature is below the minimum measurement range of the sensor. • Short circuited Pt1000 or T/C. • Broken NTC.

WARRANTY

Warranty conditions are available on our website www.novusautomation.com/warranty.