Mod-tronic MT300 Manuale utente

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MT300

Three Channel Temperature Monitor

User Manual

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Table of Contents

1 Introduction .......................................................................................................................................... 4

2 Conventions .......................................................................................................................................... 4

3 Installation ............................................................................................................................................ 5

3.1 Mounting................................................................................................................................... 5

3.2 Wiring ........................................................................................................................................ 6

3.2.1 Controller Power......................................................................................................... 7

3.2.2 Inputs .......................................................................................................................... 7

3.2.3 Outputs ....................................................................................................................... 8

3.2.4 Serial Communication................................................................................................. 9

4 Configuration ...................................................................................................................................... 10

4.1 Non-Volatile Configuration Storage ........................................................................................ 10

4.2 Primary Configuration ............................................................................................................. 10

4.2.1 ...................................................................................................................... 12

4.2.2 ...................................................................................................................... 12

4.2.3  ........................................................................................................................ 12

4.2.4 ...................................................................................................................... 12

4.2.5  .......................................................................................................................... 13

4.2.6 ...................................................................................................................... 14

4.2.7  through ................................................................................ 14

4.2.8 ...................................................................................................................... 16

4.2.9  ...................................................................................................................... 17

4.2.10  ...................................................................................................................... 17

4.2.11  ...................................................................................................................... 17

4.2.12  ........................................................................................................................ 18

4.2.13  .......................................................................................................................... 18

4.2.14 ...................................................................................................................... 19

4.2.15 ...................................................................................................................... 20

4.2.16  ........................................................................................................................ 21

4.3 Secondary Configuration......................................................................................................... 21

4.3.1 through  ................................................................................. 21

5 General Usage..................................................................................................................................... 22

5.1 Operation Modes .................................................................................................................... 22

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5.1.1 Monitoring Mode...................................................................................................... 22

5.1.2 Peak Display Mode.................................................................................................... 23

5.1.3 Setup Mode............................................................................................................... 24

5.1.4 Test Mode ................................................................................................................. 24

5.2 Access Restrictions .................................................................................................................. 24

5.3 Special Functions..................................................................................................................... 26

5.3.1 Recovery.................................................................................................................... 26

5.3.2 Error Reporting ......................................................................................................... 26

5.3.3 USB Reset .................................................................................................................. 26

6 MODBUS ............................................................................................................................................. 27

6.1 Holding Registers..................................................................................................................... 27

6.2 Input Registers......................................................................................................................... 31

6.3 Value Format Key .................................................................................................................... 31

7 Specifications ...................................................................................................................................... 40

7.1 Inputs....................................................................................................................................... 40

7.1.1 Power ........................................................................................................................ 40

7.1.2 Sensors ...................................................................................................................... 40

7.2 Outputs.................................................................................................................................... 40

7.2.1 4-20mA loop.............................................................................................................. 40

7.2.2 Relays ........................................................................................................................ 40

7.3 Communication ....................................................................................................................... 41

7.3.1 RS-485 ....................................................................................................................... 41

7.3.2 USB............................................................................................................................ 41

7.4 General .................................................................................................................................... 41

7.4.1 Accuracy.................................................................................................................... 41

7.4.2 Dimensions................................................................................................................ 41

7.4.3 Weight....................................................................................................................... 41

7.4.4 Environmental........................................................................................................... 41

7.4.5 Construction.............................................................................................................. 41

7.4.6 Approvals .................................................................................................................. 41

7.4.7 Factory Defaults ........................................................................................................ 41

8 Glossary............................................................................................................................................... 42

9 Change Log.......................................................................................................................................... 43

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1 Introduction

The MT300 is a universal, three-channel temperature monitor capable of utilizing any combination of the

supported sensor types. Three relay outputs and an internal buzzer are individually configurable to be

tripped by one or more sensor inputs. The included 4-20mA output is fully configurable and may be loop

powered or internally powered. An RS-485 interface and USB port use the MODBUS protocol to configure

the unit as well as read the configuration, sensor values, and peak values. However, all configuration and

available values are accessible via the intuitive front panel interface. Celsius and Fahrenheit scales are

supported.

Separate electrical isolation is provided on the 4-20mA loop, RS-485, and sensor inputs for compatibility

with a wide range of installation environments.

2 Conventions

Several different typestyles are used throughout this manual to make it easier to convey whether the text

refers to a button, indicator, numeric display, output, etc.

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.

If a word or phrase is first letter capitalized (Like This) it means that it refers to the name of a feature, such

as Fan Exerciser, or an input or output, such as Channel 1 or Fan Relay.

If a word or phrase is in an LED display font () it means that it refers to something displayed on

the numeric display.

If a value is preceded by “0x”, that value is in hexadecimal; other numbers should be assumed to be

decimal.

The usage of the words “alarm” and “trip”, in particular, regardless of capitalization, could be confusing.

These two words are industry standard terms for relay outputs on products such as the MT300.

Alarm could refer to the Alarm Relay output, front panel ALARM indicator, or the audible alarm (Buzzer).

However, when referring to the relay output, it is explicitly written as such. When referring to the front

panel indicator, capitalization will be used as previously described to prevent confusion.

Trip can refer to the Trip Relay output, the front panel TRIP indicator, the action of a setpoint being

exceeded, or describing the group of settings that determine a setpoint, and what happens when that

setpoint is exceeded, which is referred to as “trip settings”. Again, the previously described convention

will be used to clarify the intended meaning.

Because of the Reverse Acting Relay feature, specific terms are used to indicate whether a relay’s coil is

actually powered, or if that relay output is in the trip state regardless of the Reverse Acting Relay settings.

If referring to whether a relay’s coil is powered, “energize” will be used. If referring to if a relay output is

in the trip state, “engage” will be used.

If a relay output is engaged, the associated front panel LED will light, however, whether the relay is

energized will depend on the Reverse Acting Relay settings.

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3 Installation

There are no jumpers or user-accessible connections inside the MT300. Instead, it is suggested that the

user determines whether the C or F scale is preferred and set this before further configuration since the

MT300 will not convert existing settings when the scale is changed.

3.1 Mounting

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.

The mounting screws/bolts should be tight enough to compress the foam gasket so as to prevent

debris from entering behind the MT300.

Figure 1

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3.2 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

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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.

3.2.1.1 AC Model

On AC models, the line and neutral must be connected to the L/+ and N/-

terminals, respectively. The remaining connection is earth ground. It is

imperative that the earth ground terminal be properly connected. While the unit

will function without it, failure to do so is a potential shock hazard, may cause

reduced performance, and puts the MT300 at risk for damage due to ESD and

consequently will void the warranty.

3.2.1.2 DC Model

On DC models, the positive and negative must be connected to the L/+ and N/-

terminals, respectively. As with the AC model, the remaining connection is earth

ground, and it is imperative that the earth ground terminal be properly

connected. While the unit will function without it, failure to do so is a potential

shock hazard, may cause reduced performance, and puts the MT300 at risk for

damage due to ESD and consequently will void the warranty.

3.2.2 Inputs

The MT300 can use any combination of supported sensors which are listed in 7.1.2.

The sensor inputs are collectively isolated from the rest of the device, but are not isolated

from each other. Therefore, care must be taken to not create a situation where a voltage

differential can occur between sensors. This is generally an issue only if grounded

thermocouples are used since most RTDs are electrically isolated from the sensor casing.

Each sensor channel has four terminals. Terminals A through C are sensor inputs, and

terminal D is an earth ground connection for sensor lead wire shields. In general, shielded

and twisted pair sensor wires are the best for electrically noisy environments. In addition,

RTDs are generally more immune to noise than thermocouples, and offer better accuracy.

If a shield is provided on a sensor lead, it should be grounded at only one end for best

performance. Which end to ground is usually determined through trial and error since

otherwise it is extremely difficult to determine. Terminal D is provided for this purpose if

the sensor is grounded at the MT300 end.

3.2.2.1 RTDs

Either two-wire or three-wire RTDs may be used. Using three-wire RTDs will allow

the MT300 to automatically compensate for wire resistance as long as all three

wires have the same resistance (i.e. same wire gauge and length).

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When using two-wire RTDs, connect terminals B and C together with a short

jumper, then connect the RTD to terminal A and the junction of B and C. Be aware

that the lead wire resistance on a two wire RTD will be included in the

measurement, and therefore, will be less accurate.

When using three-wire RTDs, the uniquely colored wire is usually the one to

connect to terminal A, and the remaining two similar colored wires should be

connected to terminals B and C. If in doubt, an ohmmeter may be used to

determine which two sensor wires are connected together at the sensor end.

These are the wires that should connect to terminals B and C.

3.2.2.2 Thermocouples

The thermocouple’s positive lead should be connected to terminal A, and the

negative lead should be connected to terminal C. Generally the negative wire on a

thermocouple is red. Terminal B must remain unconnected.

3.2.3 Outputs

3.2.3.1 Relays

Three relay outputs are available: two SPDT relays and one SPST relay. It should

be noted that although the relays have specific names, the function of each relay is

fully programmable with the exception of the Fan relay, which in addition is

permanently linked to the MANUAL FAN button and the Fan Exerciser.

The terminal assignments are indicated on the rear cover of the unit; COM =

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

output has reached beyond the range defined by the user. The output may also

fall to either 3.5mA or 23mA to indicate a sensor out of range.

The loop may be configured to be external loop-powered or powered by the

MT300.

The loop output is electrically isolated from the rest of the MT300 except when

internal loop power is selected. When internal loop power is selected, it is

electrically connected to the power supply of the MT300, and therefore

electrically connected to the USB port, while other terminals on the MT300 remain

electrically isolated from the loop.

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In environments harboring a high amount of EMI or electrical interference, the 4-

20mA loop cable will need to be wrapped around a ferrite to meet the stated loop

accuracy. This ferrite is generally required only if the 4-20mA loop is used and is in

very close proximity to devices generating a high amount of EMI (such as motors

and radio transmitters). An indication this ferrite is required would be if the 4-

20mA output fluctuates wildly. If the 4-20mA loop output is stable, there is no

need to add anything. Please contact Mod-Tronic if you believe you require this

part and one will be provided free of charge.

For reference, the recommended part is Würth Elektronik 7427153.

3.2.4 Serial Communication

The MT300 includes an RS-485 and USB interface, both of which communicate using the

MODBUS protocol. Either interface may be chosen to communicate with the unit, but both

cannot be used simultaneously. Both interfaces accept the same commands and have

access to the same registers, but USB will typically be used for an easy connection to a

computer, while RS-485 will typically be used when multiple MODBUS devices must be

connected in a network, when other standalone MODBUS devices communicate with the

MT300, or when long bus length is required.

Two LEDs are located near the USB jack; one is labeled COMM and the other is labeled

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.

3.2.4.1 RS-485

RS-485 is a differential signaling method that provides high reliability over long

distances and multiple devices on a single network, over a single twisted pair. The

MT300 has two identical sets of terminals for RS-485 connections, each set

containing terminals A, B, and S. Both “A” terminals are electrically identical and

are the non-inverting connections, while both “B” terminals are electrically

identical and are the inverting connections. The “S” terminals are also electrically

identical and are for the cable shield which should be connected in one location

only. A 120Ωtermination resistor will typically be connected across terminals A

and B in each end device in an RS-485 network.

A MODBUS slave ID and baud rate must be selected in the configuration before

the RS-485 interface can be used.

The RS-485 interface is electrically isolated from other MT300 circuitry.

3.2.4.2 USB

The USB interface provides a quick and convenient method of connecting the

MT300 to a computer when an RS-485 interface is not available. The commands

and capability are identical to the RS-485 interface; the USB interface appears as a

COM port to Windows so it may be possible to use some third-party Windows RS-

485 applications with USB.

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In order to use the USB interface, a MODBUS slave ID must be selected and the

baud rate must be set to “”. The Windows application must be set to the COM

port assigned to the USB connection, baud rate set to 19.2K, and no flow control.

The USB interface is not electrically isolated.

The Windows driver is on the included CD under “MCP2200\Driver Installation

Tool”. From there, choose “x86” or “x64” depending on if your Windows

installation is 32 bit or 64 bit, respectively.

4 Configuration

To configure the MT300, Configuration Mode must be entered. To do this, press and hold the

ENTER/MENU button. If no password is set, the Primary Configuration will immediately be presented and

the first menu option, , will be displayed. Otherwise, if at least the Primary Password is set, the

MT300 will ask for the password by displaying . Use the UP and DOWN buttons to change the first

digit to the desired number, and then press ENTER/MENU to accept and move to the next digit. Continue

until all four digits have been set.

If the entered password does not match either the Primary or Secondary Password,  will

momentarily display and will revert back to Monitoring Mode. If the entered password matches the

Primary Password, access to the Primary Configuration will be granted; all configuration settings will be

available. The first menu option, , will be initially displayed. (Note: the front panel TEST button is

protected by the Primary Password)

If the entered password matches the Secondary Password, access to the Secondary Configuration will be

granted; only the trip setpoints will be available. In this case the first menu option of the “setpoint-only

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. When power to the MT300 is lost, or a reset occurs, the configuration is kept intact.

4.2 Primary Configuration

Use the UP and DOWN buttons to cycle through the base menu options, then use the ENTER/MENU

button to select. The specifics of each base menu option are detailed in the following sections. See

Figure 3 for the list and order of the base menu options.

CANCEL may be pressed at any time to back up one menu level at a time. Once a specific setting is

confirmed with the ENTER/MENU button, it is saved and the user may press CANCEL to drop back a

menu level, or pressed repeatedly until the MT300 exits Setup Mode.

If no buttons are pressed while in Setup mode for two minutes, Setup will automatically exit. Any

changes made will be saved. The automatic exit function simulates a press of the CANCEL button.

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