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Mod-tronic MT300 User Manual

Three channel temperature monitor
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MT300
Three Channel Temperature Monitor
User Manual
MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ●
www.mod-tronic.com
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  • Page 1 MT300 Three Channel Temperature Monitor User Manual MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 1 of 43...

  • Page 2: Table Of Contents

     ........................20 4.2.15  ........................21 4.2.16 Secondary Configuration ......................21 through  ................. 21 4.3.1 General Usage ............................. 22 Operation Modes ........................22 MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 2 of 43...
  • Page 3 Weight ........................41 7.4.4 Environmental ......................41 7.4.5 Construction ......................41 7.4.6 Approvals ........................41 7.4.7 Factory Defaults ......................41 Glossary ............................... 42 Change Log ............................43 MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 3 of 43...

  • Page 4: Introduction

    In general, if a word or phrase is in all caps (LIKE THIS) it means that it refers to the name of a button or single LED indicator on the MT300 front panel. Exceptions to this are acronyms such as USB and MODBUS.

  • Page 5: Installation

    The MT300 should be installed in a rectangular cutout of dimensions 5.6” x 9.0”, or 142mm x 229mm. The dimensions of the MT300 are shown in Figure 1 for reference. It’s easiest to place the MT300 in the cutout, then mark or directly drill the screw mount holes.

  • Page 6: Wiring

    The rear panel is shown in Figure 2 and provides a visual guide of the terminal block connections. Each connection is detailed in following sections. Figure 2 MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 6 of 43...

  • Page 7: Controller Power

    3.2.1 Controller Power The MT300 is available in AC and DC models. While the external connections appear identical, care must be taken to properly connect the appropriate power supply. The power input for both the AC and DC model is electrically isolated from the rest of the MT300 circuitry.

  • Page 8: Outputs

    Common, NO = Normally Open, and NC = Normally Closed. 3.2.3.2 4 – 20mA Loop A 4 – 20 mA output is provided on the MT300. This output will pass a current between 4 and 20 mA to represent one of the sensor inputs. The output will fall as low as 3.8mA or as high as 21mA during normal operation in which the loop...

  • Page 9: Serial Communication

    ERROR. The COMM LED will blink when the selected interface, RS-485 or USB, is sending or receiving data. This LED will blink when the selected interface receives anything, including invalid data. The ERROR LED will blink if the MT300 receives a valid MODBUS message with a function code that isn’t supported by the MT300.

  • Page 10: Configuration

     menu”, , will be initially displayed. Should the user set the Primary Password and the Secondary Password to the same code, the MT300 will  behave as if the Secondary Password is disabled (i.e. set to 4.1 Non-Volatile Configuration Storage All configuration settings are stored to non-volatile memory at the point of exiting Configuration Mode.
  • Page 11     a   Y         T      R Figure 3 MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 11 of 43...
  • Page 12 Applying an offset may be useful to compensate for a sensor offset, or in effect, change multiple setpoints by only changing the offset value. It is possible to measure temperatures beyond the MT300’s specified range by applying an offset since only the displayed temperature is prevented from exceeding the rated range, however, accuracy in this case is not guaranteed.
  • Page 13 ENTER/MENU is used to save that setting and move to the next set. Once the final setting, span, is set, the display reverts to the base menu. Each of the four settings is described below in the order they are presented on the MT300: ...

  • Page 14: Through

    Figure 5 illustrates the sequence of options for each trip setting. The character below each setting, if shown, is the character that is shown on the leftmost digit on the MT300. This character helps the user remember what each setting is, otherwise would be difficult to distinguish from others.
  • Page 15 Trip: Engage Trip Relay on trip.  Buzzer: Engage Buzzer on trip.  Setpoint: Trip setpoint.  Hysteresis: Hysteresis for automatic trip cancel. Table 1 MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 15 of 43...
  • Page 16 This configures the MODBUS serial communications. The first option sets the slave ID of the MT300. Use UP and DOWN buttons to change the ID, and ENTER/MENU to confirm the desired ID. The second option sets the bitrate for RS-485, or alternately, selects USB. USB and RS-485 cannot be used simultaneously;...
  • Page 17 FAN, ALARM, and TRIP indicators will continue to behave the same.          Figure 8 MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 17 of 43...
  • Page 18 However, if the Primary Password is set to , both the Primary and the Secondary Password will automatically be disabled; therefore the MT300 will not prompt for the Secondary Password. See Figure 9 for the sequence of settings shown for this configuration.
  • Page 19 4.2.14  This sets the behavior of the MT300 when the error occurs. When this setting  is selected by pressing ENTER/MENU, followed by the present setting is initially displayed. The setting can be changed by pressing the UP and DOWN buttons, then ...
  • Page 20 4.2.15  This sets the behavior of the MT300 when the Test Mode is invoked. When this setting is  selected by pressing ENTER/MENU, followed by the present setting is initially displayed. The setting can be changed by pressing the UP and DOWN buttons, then ENTER/MENU is ...

  • Page 21: Secondary Configuration

     4.2.16 This sets the MT300 to factory defaults. If ENTER/MENU is pressed while this option is selected, (reset?) will be displayed in order to make sure the user really wants to continue. Press ENTER/MENU to confirm the reset. A progress indicator will be displayed, ...

  • Page 22: General Usage

    Setup Mode is used when configuring the unit; sensor inputs are not monitored when in this mode. In Test Mode, sensor inputs are not monitored and the MT300 ceases all regular operations. Instead, the unit enters a self-test sequence.

  • Page 23: Peak Display Mode

    An alternative way to automatically cancel a trip when the trip condition no longer exists is to use the hysteresis feature. 5.1.1.6 ENTER/MENU From Monitor Mode, pressing and holding this button will cause the MT300 to enter Setup Mode. 5.1.1.7 UP and DOWN While in Monitor Mode, these buttons will cycle through the displayed channel if Y...

  • Page 24: Setup Mode

     The relay outputs, Buzzer, and 4-20 Loop will behave according to 4.2.15. Press and hold CANCEL to exit from Test Mode. The MT300 will reset (behave as if power was momentarily disconnected) when exiting Test Mode. Test Mode will automatically exit after two minutes.
  • Page 25 Should the user set the Primary Password and the Secondary Password to the same value, the MT300 will behave as if the Secondary Password is disabled, i.e. it will be impossible to access the setpoint-only configuration. Note that both passwords, like all of the MT300’s settings, can be read and changed via MODBUS regardless of whether a password is set or not.

  • Page 26: Special Functions

    The factory default listing is in 7.4.7.  : This error indicates the respective sensor input channel is reporting a temperature below the allowed range of the MT300. This is often due to the incorrect sensor type selected, or a defective or missing sensor. ...

  • Page 27: Modbus

    Configuration values are considered to be in Holding Registers, while the read-only status values are considered to be in Input Registers. If a written value is not within the valid range, the MT300 will automatically change it to the factory default value, which is listed in 7.4.7.
  • Page 28 (2 * y ) value 1 The first 16 bit value to be written value n Additional 16 bit values to be written cyclic redundancy check MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 28 of 43...
  • Page 29 2 Trip-A Over/Under, 2 Trip-A Fan Relay Enable 0x0024 2 Trip-A Trip Relay Enable, 2 Trip-A Alarm Relay Enable 0x0025 2 Trip-A Buzzer Enable, 2 Trip-A Output Reset Method MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 29 of 43...
  • Page 30 Test Mode Fan behavior, Test Mode Alarm behavior 0x0048 Test Mode Trip behavior, Test Mode Buzzer behavior 0x0049 A/D Error 4-20 Loop behavior 0x004A Test Mode 4-20 Loop behavior Table 3 MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 30 of 43...

  • Page 31: Input Registers

    Channel 3 Maximum Table 4 6.3 Value Format Key Table 5 contains the legend for the last column of the MODBUS register tables. Value Definition Format MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 31 of 43...
  • Page 32 Valid values are 0 – 120, representing the number of minutes that elapses before a Manual Fan activation is disengaged. 0 disables feature. Example Set Period to 10 (0x0A) and Timeout to disabled (0x00): 0x0A00 MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 32 of 43...
  • Page 33 The LSB is first. Example Set to 200F (0xC8): 0xC800, and Temperature Scale must be set to Fahrenheit. MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 33 of 43...
  • Page 34 Upper byte: Value Mode 0x00 Disabled 0x01 Enabled Lower byte: Value Mode 0x00 Disabled 0x01 Enabled Example Enable the first setting(0x01) and disable second setting(0x00): 0x0100 MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 34 of 43...
  • Page 35 The LSB is first. Example Set to 200F (0xC8): 0xC800, and Temperature Scale must be set to Fahrenheit. MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 35 of 43...
  • Page 36 Output Reset Method: Value Mode 0x00 Reset Using Hysteresis 0x01 Reset Using Cancel Example Disable Buzzer Enable (0x01) and set Reset Method to Using Hysteresis (0x00): 0x0100 MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 36 of 43...
  • Page 37 I = current loop output in mA x = 4-20mA loop value Example 0x2403 Read as 0x0324, or 804 I = 3.5 + (804 / 200) = 7.52mA MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 37 of 43...
  • Page 38 This register holds the 4-20 Loop behavior on A/D Error setting. Value Mode 0x0000 3.50mA 0x0001 20.50mA 0x0002 No Change Example Set to 20.50mA (0x0001): 0x0001 MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 38 of 43...
  • Page 39 Valid values are 350 (0x015E) to 2100 (0x0834), which represents 3.50mA to 21.00mA, respectively. Two additional valid values are: Value Mode 0x0835 No Change 0x0836 Cycle Example Set to 12.50mA (0x04E2): 0x04E2 Table 5 MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 39 of 43...

  • Page 40: Specifications

    240VAC, 22A, 1 ½ HP, General Use in 72°C ambient 240VAC, 30A, 1 ½ HP, General Use in 55°C ambient Alarm and Trip: 240VAC, 10A, General Use MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 40 of 43...

  • Page 41: Communication

    4-20, Source 4-20, Zero 4-20, Span Silent Disabled Trip, Setting Disabled Trip, Error Disabled Trip, Fan Disabled Trip, Alarm Disabled Trip, Trip Disabled Trip, Buzzer Disabled MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 41 of 43...

  • Page 42: Glossary

    A communications protocol frequently used by industrial electronics. RS-485 A differential serial communications bus frequently used in industrial environments. Remote Terminal Unit: A MODBUS communication mode. MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 42 of 43...

  • Page 43: Change Log

    5.3.2: Changed text of “” paragraph Table 3: Added lines starting at 0x0045 Table 5: Added S, T, and U 7.4.7: Added Test Mode and sensor input section failure defaults MT300 User Manual (2) Tel: 905.457.6322 ● Fax: 905.457.4716 ● www.mod-tronic.com Page 43 of 43...

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