937CU-AITXF-DC1 Installation Instructions Transmitter Supply Converter
Bul. 937C Transmitter Supply Converter Installation Instructions Symbols Used This symbol warns of possible danger. Failure to heed this warning may result in personal injury or death, or property damage, including destruction. Warning This symbol warns the user of a possible fault. Failure to heed this warning can lead to total failure of the device and any other connected equipment. Attention This symbol draws attention to important information.
Bul. 937C Transmitter Supply Converter Installation Instructions Safety Notes The Transmitter Supply Converter must only be operated by trained personnel in accordance with this handbook. Attention Attention The protection of operating personnel and of the system is only ensured if the devices are used in accordance with their intended purpose. Any other type of operation than that described in this manual places the safety and functionality of the devices and systems connected to them in question.
Bul. 937C Transmitter Supply Converter Installation Instructions Installation and Connection Application Information Bulletin 937 Intrinsically Safe Barriers transmit signals between field devices and a process control system/control system. They are suitable for the connection of field devices used in potentially explosive atmospheres. Safe field circuits for these devices are intrinsically safe and are galvanically isolated from non-intrinsically safe circuits.
Bul. 937C Transmitter Supply Converter Installation Instructions Installation The Transmitter Supply Converter can be mounted on a 35 mm standard rail corresponding to DIN EN 60175. The devices must be snapped onto the rail vertically, and never slanted or tipped to the side. CORRECT: Device snapped on vertically. 4 INCORRECT: Device snapped on from the side. Can damage the contacts and cause the device to fail.
Bul. 937C Transmitter Supply Converter Installation Instructions Connection The removable terminals of the Bulletin 937 Converters simplify the connection and the switch cabinet assembly. They make it possible to replace devices quickly and without error if a customer service becomes necessary. Terminals are equipped with screws, are self-opening, have a large connection area for a wire cross-section up to 2.5 mm2/14 AWG and coded plugs, making it impossible to mix them up.
Bul. 937C Transmitter Supply Converter Installation Instructions Connection (Output) Safe Side The functions of the other black terminals are as follows: The control circuit and the power supply are connected to the black terminals 7 to 24. 1+ 23 mA 10 11 12 I 16 17 18 II 78+ III 23+ 24- 24 V DC The terminals have the following functions: • Terminals 7/8: current output (terminal 9 not used) • Terminals 10 ... 12: relay 1 • Terminals 16 ...
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Bul. 937C Transmitter Supply Converter Installation Instructions Display modes and error messages In normal operation, the current measured value is indicated in the selected unit. If the Alarm freeze is triggered but the device continues operating normally, a corresponding message appears in the second line of the display.
Bul. 937C Transmitter Supply Converter Installation Instructions Parameterization mode control panel Programming Main menu parameterization mode Display mode OK + ESC (simultaneously, 1 sec) ←ESC Unit () Input () Output Service You can return to display mode from any point in the menu in parameterization mode by pressing the ESC key (possibly multiple times). If you do not press any key for 10 minutes in parameterization mode, the device automatically switches back into display mode.
Bul. 937C Transmitter Supply Converter Installation Instructions Password You can protect the current configuration from unauthorized changes by using a password (See Service ; inactive when universal frequency converter is delivered). If password protection is active, the various settings in parameterization mode are visible before entry of the password, but may not be changed. The first time an attempt is made to change a setting, the device automatically displays a window for entering the password.
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Bul. 937C Transmitter Supply Converter Installation Instructions Lowest menu level Choose Values, Enter Numbers At the lowest level of the menus, you can either choose between particular possible values for individual parameters, or enter a numeric value. Lowest menu level Parameters OK→ ←ESC current value, flashing , ↓ : ESC↑ new value, flashing OK↓ ←ESC new value, saved, not flashing When entering numeric values, please note: • If you press the or key, the value changes stepwise.
Bul. 937C Transmitter Supply Converter Installation Instructions Units The following illustration shows the units menu. Menu items on the lowest level are outlined in bold. The Universal Transmitter Power Supply measures in mA. Using the parameters zero point and conversion factor it converts the measured value into the selected units. These units are used for the display of the measured values and for all corresponding settings in the parameterization mode.
Bul. 937C Transmitter Supply Converter Installation Instructions Input The following diagram shows the input parameters menu. Items from the lowest menu level are outlined in bold. The menu items Zero point and Conversion factor will not be shown if the unit mA is selected. Input —— Line monitor —— LB —— LB On LB Off SC —— SC On SC Off Zero point Conversion factor Linearization —— —— —— -15 mA ... 15 0.100 ... 5000 Linearization On Linearization Off Smoothing 14 —— 0 s ...
Editing device data: Input Bul. 937C Transmitter Supply Converter Installation Instructions Line monitor • If you select On for LB,an input current <0.2 mA will be registered as a lead break. • If you select On for SC,an input current >0.22 mA will be registered as a short circuit. • If you wish to process the <0.2 mA input values as measured values, you must deselect the lead breakage deterction (Off LB). If not, an error will be signalled within the measuring range.
Editing device data: Input Bul. 937C Transmitter Supply Converter Installation Instructions Example 1: selected unit °C, 0 °C ... 200 °C is to correspond to 4 mA ... 20 mA y [°C] 200 150 100 50 -4 -3 -2 -1 -50 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 x [mA] -100 -150 -200 • Linearization y=mx+n • Conversion factor = rise in the graph m = (y2 – y1) / (x2 – x1) m = (200 – 0) / (20 – 4) = 12.
Editing device data: Input Bul. 937C Transmitter Supply Converter Installation Instructions Example 2: selected unit °C, 0 °C ... -100 °C is to correspond to 20 mA ...
Editing device data: Input Bul. 937C Transmitter Supply Converter Installation Instructions Example 3: selected unit bar, -4 bar ... 4 bar is to correspond to 4 mA ... 20 mA y [bar] 4 3 2 1 -4 -3 -2 -1 -1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 -2 -3 -4 • • • 18 Linearization y=mx+n Conversion factor = rise in the graph m = (y2 – y1) / (x2 – x1) m = (4 - 0) / (20 – 12) = 0.5 Zero point = intersection point with the x-axis on the graph (bar value at y = 0) n=y–mx n = 4 – 0.
Bul. 937C Transmitter Supply Converter Installation Instructions Linearization Using the FDT parameterization software, a linearization table can be saved in the Transmitter Supply Converter; for details of this function see On-line help. Via the operator panel you can merely switch the use of the table for the calculation of the output value on and off (On/Off).
Bul. 937C Transmitter Supply Converter Installation Instructions Relays The following diagram shows the relay outputs menu. Items from the lowest menu level are outlined in bold. From the Rel1 and Rel2 menu options, you can use the OK key to get to a menu in which you can enter individual parameters for the selected relay. Both menus are structured in the same way and are thus only described once. Information about current output.
Bul. 937C Transmitter Supply Converter Installation Instructions Alarm freeze —— On Off Delay —— 0 s ... 250 s Operating behaviour The switching direction can be set as Max or Min and the direction of action as Active or Passive . Application ranges: • Switching direction Max, mode of operation Active: alarm on trip value overrange, e. g. audible alarm on • Switching direction Max, mode of operation Passive: switch off on trip value overrange, e. g. pump, heating, ...
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Bul. 937C Transmitter Supply Converter Installation Instructions Trip and Hysteresis When entering the values for Trip and Hysteresis please note: • Both values are to be entered in the units, which were selected under Units. • You can enter values − between 0 mA and 24 mA and - between the converted values of these limits in the selected units; for conversion using the parameters Zero point and Conversion factor.
Bul. 937C Transmitter Supply Converter Installation Instructions The following diagram shows the operating behaviour for the trip mode Max, operating mode Active.
Bul. 937C Transmitter Supply Converter Installation Instructions Current output The following illustrations show the current output menus. Items from the lowest menu level are outlined in bold. Review the information about relay outputs. Output —— Rel1 Rel2 Iout —— Characteristics —— 0 mA ... 20 mA 4 mA ... 20 mA NE43 4 mA ...
Bul. 937C Transmitter Supply Converter Installation Instructions Start value —— 7.5.3 End value —— 7.5.3 Inverted —— Inverted Normal Characteristic With the parameters Start value and End value establish a sub-range of the input signal as the measuring range of the application. This measuring range is formed linearly on the output signal. The following table shows, for the various characteristics, the conversion of the Start value and End value and the behaviour during measuring overrange.
Bul. 937C Transmitter Supply Converter Installation Instructions Characteristic Start value converted into End value converted into Linear Linear overrange underrange up to up to 0 mA ... 20 mA 0 mA 20 mA 0 mA 20.5 mA 4 mA ... 20 mA NE43 4 mA 20 mA 3.8 mA 20.5 mA 4 mA ... 20 mA 4 mA 20 mA 0 mA approx. 22 mA Example of a diagram of a mA measurement range on the output signal Characteristic 4 mA ... 20 mA NE43, start value 2 mA, end value 10 mA mA 20.5 20.0 4.0 3.8 0 -1.
Bul. 937C Transmitter Supply Converter Installation Instructions Fault current The following table shows the current output in the event of a fault, depending on the characteristic. Setting Up/Down 0 mA ... 20 mA 4 mA ... 20 mA NE43 4 mA ... 20 mA 21.5 mA 21.5 mA 22 mA with short-circuit with short-circuit with short-circuit (not distinguishable from End value overrange) 0 mA 2.
Bul. 937C Transmitter Supply Converter Installation Instructions Service The following diagram shows the service parameter menus. Items from the lowest menu level are out-lined in bold. Service —— Password —— On Off Language —— DE (German) ENG (English) Reset (see below) —— On Of Reset: Pressing the OK key when On Reset is flashing resets all settings on the transmitter supply converter to default. Any entries that you have made in parameterization mode are lost.
Editing device data: Default settings Bul. 937C Transmitter Supply Converter Installation Instructions Default settings Menu Parameter Default setting Main menu Unit mA Input Output Rel1 Output Rel2 Output Iout 30 Line monitor On LB/On SC Zero point 4.000 mA Conversion factor 0.100 Linearization Off Smoothing 3s Min/Max (= switching direction) Min Trip 16.00 mA Hysteresis 2.000 mA Mode Passive Alarm freeze Off Delay 0s Min/Max (= switching direction) Min Trip 2.
Bul. 937C Transmitter Supply Converter Installation Instructions Menu Service Parameter Default setting Fault current Min Start value 0.000 mA End value 20.
(DIR 10001176477) Publication 937-IN002A-EN-P - April 2014 (DIR 10001099000) 814569 Copyright © 2014 Rockwell Automation, Inc. All rights reserved. Printed in the U.S.A .
