Rockwell Automation 937CU-DIFRQ-1 User Manual

937CU-DIFRQ_1 Installation Instructions

Universal Frequency Converter

Symbols Used

Warn ing

Warn ing

Attention

Note

Bul. 937C Universal Frequency Converter Installation Instructions

This symbol warns of possible danger.
Failure to heed this warning may result in personal injury or death, or property
damage, including destruction.

This symbol warns the user of a possible f ault.
Failure to heed this warning can lead to total failure of the device and any other
connected equipment.

This symbol draws attention to important information.

1

Safety Notes

Warn ing

Attention

Attention

Attention

Warn in g

Attention

Warn in g

Note

Note

Bul. 937C Universal Frequency Converter Installation Instructions

The Frequency Converter with Trip Values must only be operated by trained personnel
in accordance with this handbook.

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.

The devices may only be installed, connected, and adjusted by electrical professionals
outside the hazardous area.

If faults cannot be elimina ted, the devices must b e taken out of operation and protected
from being placed in service again inadvertently. Tampering with or making changes to
the devices is dangerous and therefore not permitted. They render the warranty void.

The responsibility for the adherence to local safety standards lies with the operator.

2

Bul. 937C Universal Frequency Converter Installation Instructions

Installation and Connection

Application Information

Bulletin 937 Intrinsically Safe
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. establish an
electroma gnetic separation be tween the potentially
explosive atmospheres and the safe areas in a system.

Typical applications for the Bulletin 937 universal
frequency converter are flow and RPM measurements.

The universal frequency converter accomplishes this by
converting an input frequency into a
frequency-proportional current which can, for example,
then be redirected to a display device or the analog input of
the process control system/control system.

Moreover, the universal frequency converter can be used
universal frequency converter as a signal divider and as a
rotational speed controller (limit-value display for MAX
alarm and for MIN alarm).

Convertes transmit signals

3

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

IN EN 60175. The devices must be snapped onto the rail vertically, and never slanted or tipped to the

D
side.

4

Bul. 937C Universal Frequency Converter Installation Instructions

Connection

The removable terminals of the Bulletin 937 Converters simplif y 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 mm/14 AWG and
coded plugs, making it impossible to mix them up.

The intrinsically safe field circuit is connected to the blue
terminals 1 and 3. These may be g uided into the potentially
explosive areas with connector cables in accordance with
DIN EN 60079-14. Terminal 2 is always left unconnected.

The non-intrinsically safe field circuit is connected to
terminals 1 through 3.

Yo u c an co nn e ct :

• A sensor corresponding to DIN EN 60947-5-6
(NAMUR)

chanical contact

A me

•

For sensors that do not have the appropriate internal
resistors, you can add the following externally (as close as
possible to the sensor):

• A series resistor for short circuit monitoring

In reference to these monitoring options, please see also
Units.

5

Bul. 937C Universal Frequency Converter Installation Instructions

23

24

14

13

RS232

2
3

1

7

8

20

18

19

17

16

12

11

10

Start-up
override/
pulse
suppression

Ter min al s

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
erminals 13/14: start-up override or pulse suppressi

• T

nput (15 unused)

i

• Terminals 16 ... 18: relay 2

• Terminals 19/20: transistor output (21 unused)

• Terminals 23/24: power supply

(22 unused)

• On the exact terminal assignments, please see also the data

sheet.

on

6

Bul. 937C Univers

Display Modes and Operation

Front side of the Universal Frequency Converter
LED Indicators

IN CHK 1

• Flashing yellow cyclically - indicates input pulses

• Flashes red - indicates input malfunction

• Continuous red - indicates device malfunction

PWR (green)

• For displaying the supply voltage

LED OUT 1 (yellow)

• Indicates relay 1 active

LED OUT 2 (yellow)

• Indicates relay 2 active

LED OUT 3 (yellow)

• Indicates transistor active

RS 232 serial interface

• For connection to a PC for configuration and dia gnosis of the
universal frequency converter using FDT

Display

• Shows measurement values and malfunctions and for
parameterization mode

•



(Up) (Down) ESC (Escape) OK

• Four keys for parameterization on the universal frequency
converter

al Frequency Converter Installation Instructions

654321

1

PWR

IN

CHK

2

1

OUT

3

RS232

19 20 21 242322

esc

ok

10 11 12987
16 17 18151413

7

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.

If a malfunction occurs, one of the following messages is displayed (during appropriate parameterization)
until the malfunction is eliminated:

Err Device error

•

• Err LB for an lead breakage

• Err SC for a short circuit

On selecting error messages Refer to Display modes and error messages. The

switch outputs always revert to a no-current state when there is a malfunction.

Configuring Device Data

WARNING: A change in device data will change the operation of the device!
WARNING: Before ente

installation will result.

FDT Interface

This manual describes Parameterization mode of the universal frequency converter using the control panel. parameterization mode
for the universal frequency converter is more convenient with a PC using Field Device Tool (FDT) software.

Some specialized functions can only be selected using the FDT , for instance, pulse suppression as an alternative to the start-up
override.

The FDT interface is the specification describing the standardized data exchange between devices and control system or engineering

or asset management tools. Examples include: PACTware
FDT frame software can be downloaded from the web: www.pactware.com www.fdtgroup.org.

TM

PACTware

ring new data into the device, you should therefore as certain that no danger to the

TM

, FieldCare, FactoryTalk AssetCentre, and Process Device Configuration.

is trademark of PACTware Consortium

8

Parameterization mode control panel

Programming

Bul. 937C Universal Frequency Converter Installation Instructions

Main menu parameterization mode

Display mode

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.

OK + ESC (simultaneously, 1 sec) 

ESC

Unit ()

Input ()

Output

Service

9