937CU-DIFRQ_1 Installation Instructions Universal Frequency Converter
Bul. 937C Universal Frequency 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 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 Universal Frequency Converter Installation Instructions Safety Notes The Frequency Converter with Trip Values must only be operated by trained personnel in accordance with this handbook. Attention Warning 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.
Bul. 937C Universal Frequency Converter Installation Instructions Installation and Connection Application Information Bulletin 937 Intrinsically Safe Convertes 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 Universal Frequency Converter Installation Instructions Catalog Number Explanation The following versions of the universal frequency converter are available: 937CU-DIFRQ-__1 Code Description DC Supply Voltage: 24 VDC or via Power Rail (24 VDC) Interface BC Universal Supply voltage: From 20 VDC up to 90 VDC From 48 VAC up to 253 VAC Installation The Universal Frequency Converter (UFC) can be mounted on a 35 mm standard rail corresponding to DIN EN 60175.
Bul. 937C Universal Frequency 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 Universal Frequency Converter Installation Instructions Terminals Terminals 4 ... 6 do not exist for the universal frequency converter. The functions of the other black terminals are as follows: • Terminals 7/8: current output (9 unused) • Terminals 10 ... 12: relay 1 • Terminals 13/14: start-up override or pulse suppression input (15 unused) • Terminals 16 ...
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Bul. 937C Universal Frequency Converter Installation Instructions Display modes and error messages The current measurement value is shown on the display in normal operating mode. On selecting the unit, Refer to Units. If restart inhibit (Refer to Restart inhibit) has been triggered, but the device is still working in normal mode, a message to that effect appears in the second line of the display.
Bul. 937C Universal Frequency 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 Universal Frequency 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 Universal Frequency 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 Universal Frequency Converter Installation Instructions Units The following illustration shows the units menu. Menu items on the lowest level are outlined in bold. Unit (see below) —— Hz rpm r/sec l/min l/h m³/h m/s km/h The Unit is used for display of measured values and for all corresponding settings in parameterization mode. The universal frequency converter always works internally in Hz (actually in mHz = 0.001 Hz).
Bul. 937C Universal Frequency Converter Installation Instructions The Unit is used for display of measured values and for all corresponding settings in parameterization mode. The universal frequency converter always works internally in Hz (actually in mHz = 0.001 Hz). If you want the measurement value to be displayed in rpm or r/sec, the number of input pulses per revolution must be specified.
Input Bul. 937C Universal Frequency Converter Installation Instructions The following illustration shows the menus for the input parameters. Menu items on the lowest level are outlined in bold. Menu items which only appear under certain conditions are marked in grey. Input —— Lead monitor (see below) —— LB —— ON LB OFF LB SC —— ON LK OFF LK Smoothing (see below) —— Pulses/unit () —— Bounce filter (see below) —— 0 sec ... 255 sec 1 ...
Bul. 937C Universal Frequency Converter Installation Instructions •For lead break monitoring, an appropriate parallel resistor must be present in the sensor or externally. For short-circuit monitoring, an appropriate series resistor must be present in the sensor or externally (See Display Modes and operation). No lead break monitoring is possible for NPN sensors and pushpull output stages. If you are using a sensor of this type, you should always select OFF for LB.
Bul. 937C Universal Frequency Converter Installation Instructions Pulses/unit The menu option Pulses/unit only appears if you have selected a unit other than Hz for the measurement value display (See Units). Depending on the unit chosen, you must enter the number of pulses per revolution, per liter, per m3, or per km. Pulses per km should also be entered for the unit m/s. For conversions, please consult section . Examples: •The speed of a stirring mechanism will be displayed in rpm (or r/sec).
Bul. 937C Universal Frequency Converter Installation Instructions Start-up override Activation of start-up override and its effect: •You can activate start-up override with a signal to terminals 13/14 (at least 100 ms). •Start-up override prevents switch outputs from signalling a limit violation during the configured override period (start-up phase). •Start-up override affects only those switch outputs with the MIN switching direction (Refer to Limit switch).
Bul. 937C Universal Frequency Converter Installation Instructions Output The following illustrations show the menus for the output parameters. Output —— Rel1 () —— Limit switch Serial switching Pulse divider Error switch Rel2 () —— same menu as Rel1 OT1 () —— same menu as Rel1 Iout () Switching outputs From the Rel1, Rel2 and OT1 menu options, the OK key takes you to a menu in which you can enter parameters for the selected switch output.
Bul. 937C Universal Frequency Converter Installation Instructions Limit switch The following illustration shows the menu levels which are accessible through the Limit switch menu option. Menu items on the lowest level are outlined in bold. If the Limit switch function is activated (On), the OK key takes you from the Limit switch menu option to the MIN/MAX menu option.
Bul. 937C Universal Frequency Converter Installation Instructions Operating Behavior Either Max or Min may be selected as operating behavior; either Active or Passive may be selected as operating mode (See Limit switch).
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Bul. 937C Universal Frequency Converter Installation Instructions Switching Point and Hysteresis When entering values for the switching point and hysteresis, please note: •Both values should be entered in the unit that was selected under Unit (Refer to Units). Values can be entered between 0.001 Hz and 5000 Hz (for non-ex devices: 12 kHz). You can determine the input limits for a unit other than Hz by using the conversions given in Units.
Bul. 937C Universal Frequency Converter Installation Instructions Restart inhibit Restart inhibit prevents temporary trip value violations or line faults (Err LB, Err SC; Refer to Display modes and error messages and Input) from not being noticed by operations personnel. •If Alarm freeze On has been selected, the new state is retained after an output is switched until one of the following actions takes place: –Device is restarted –Signal on terminals 13/14 –ESC key pressed.
Bul. 937C Universal Frequency Converter Installation Instructions Serial Switching To select this function, in the serial switching menu option, press the OK key twice. You can cancel after the first OK with ESC. When serial switching is selected, input pulses are switched 1:1 to the switch output. Pulses can then be evaluated in the process control system/in the control unit. So in this function, the Bul. 937 device is only an isolator between intrinsically safe and non-intrinsically safe circuits.
Bul. 937C Universal Frequency Converter Installation Instructions Pulse Divider The following illustration shows the menu levels which follow the Pulse divider menu option. Menu items on the lowest level are outlined in bold. If the Pulse divider function is activated (On), the OK key takes you from the Pulse divider menu options to the Divider ratio menu. When you first activate the Pulse divider function, after the second press on the OK key, the Divider ratio is immediately shown.
Bul. 937C Universal Frequency Converter Installation Instructions Error switch The following illustration shows the menu levels which are accessible through the Error switch menu option. Menu items at the lowest level are outlined in bold. If the Error switch function is activated (On), the OK key takes you from the Error switch menu option to the Alarm freeze menu option.
Bul. 937C Universal Frequency Converter Installation Instructions Current output The following illustration shows the menu levels which are accessible from the Iout menu option. Menu items on the lowest level are outlined in bold. Iout —— Characteristic () —— 0 mA ... 20 mA 4 mA ... 20 mA, NAMUR NE 43 4 mA ...
Bul. 937C Universal Frequency Converter Installation Instructions Current path characteristic The various settings have the following meaning (for setting the starting value and final value, See Start value and final value; if you select the inverted characteristic, the conversion of starting value and final value will be exchanged): Setting 0 mA ... 20 mA mA 20.5 20.0 0 100 0 102.5 % For this setting, the start value is converted to 0 mA and the final value to 20 mA.
Bul. 937C Universal Frequency Converter Installation Instructions Setting 4 mA ... 20 mA mA 21.5 20.0 4.0 0 - 25 0 100 110 % For this setting, the initial value is converted to 4 mA and the final value to 20 mA. Intermediate values are converted proportional. If the value falls below the start value, the output current falls linearly to 0 mA (- 25 % of the measurement range). Additional underranges cannot be evaluated (output 0 mA).
Bul. 937C Universal Frequency Converter Installation Instructions Fault current Setting Current path characteristic 0 mA ... 20 mA Current path characteristic 4 mA ... 20 mA, acc. NAMUR NE 43 Characteristic 4 mA ... 20 mA hold last measured value before fault occurred Max (upscale) approx. 21.5 mA approx. 21.5 mA approx. 21.5 mA (indistinguishable from overlimit of final value) Min (downscale) 0 mA (indistinguishable from underlimit of starting value) 2.0 mA 2.
Bul. 937C Universal Frequency Converter Installation Instructions Service The following illustration shows the menus for the service parameters. Menu items on the lowest level are outlined in bold. Service —— Password —— On Off Language —— DE (German) ENG (English) Reset (see below) —— no yes Reset: If the value yes is shown flashing and you press the OK key, all parameters in the Universal Frequency Converter will be reset to their factory settings.
(DIR 10001176478) Publication 937-IN001A-EN-P - April 2014 (DIR 10001098996) 814568 Copyright © 2014 Rockwell Automation, Inc. All rights reserved. Printed in the U.S.A .
