Omega DRA-CSM-1 Installationsanleitung

DRA-CSM-1

CURRENT MULTIPLEXER

User’s Guide

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Contents

1. GENERAL DESCRIPTION

2. MOUNTING INSTRUCTIONS

3. REPLACING FUSES

4. ASSEMBLY

5. SUPPLY VOLTAGE

6. CONNECTING TRANSMITTERS TO THE MULTIPLEXER

6.1 Two-Wire Transmitter

6.2 Three-Wire Transmitter

6.3 Four-Wire Transmitter

7. CONTROL

7.1 Enable/Test

7.2 Address

7.3 Address Polarity

7.4 Control Tables

7.4.1 True Low Setting

7.4.2 True High Setting

8. MULTI-DROP CONFIGURATION

9. SPECIFICATIONS

1.GENERAL DESCRIPTION

WARNING: Never connect a voltage source as an input to the

multiplexer. Its internal low dynamic impedance

will cause immediate fuse blowing.

3. REPLACING FUSES

2. MOUNTING INSTRUCTIONS

The DRA-CSM-1 is a multiplexer for 16 analog 4-20mA current loops.

The transmitter/transducer currents are input via "I" terminals. Each input is

protected by a 63mA fuse.

The current input is steered either to the output ("lo") terminal or to the negative

(COM) terminal of the power supply (PWR). Fifteen channels are routed to the

COM and only the selected one is routed to the output terminals, thus ensuring

a continuous and uninterrupted current loop.

The multiplexer's channel selection is controlled by 4 address lines, generated by

the PLC's discrete output module.

The unit provides 16, current limited (~40mA), voltage supply ("V") outputs. These

outputs are derived from the mux's power supply input and are used to feed two-

wire transmitters. The current limitation avoids fuse blowing in cases of short-

circuit of the transmitters' leads.

The DRA-CSM-1 is designed for standard DIN rail mounting.

Place the unit on the upper part of the mounting rail with the fastening tab facing

down. Loosen the tab slightly, using a suitable flat screwdriver, and attach the unit

to the rail. After releasing the tab, make sure that the unit is fastened securely in

place.

To replace a blown fuse, disassemble the unit as follows:

a. Take off both terminal strips by removing the four screws at the edges.

Note: This does not require disconnecting the cables connected to the strips.

b. Remove the front panel using a suitable flat screwdriver. Press down gently on

the plastic springloaded tabs located in the slots on either side of the unit.

4. ASSEMBLY

Note: The terminal strips are polarized and must not be placed backwards.

WARNING: Never install a channel fuse rated more than

100mA, and main fuse rated more than 800mA.

5. POWER SUPPLY

Figure 1.

The DRA-CSM-1 is supplied by a regulated power supply at a range of 15 to

40Vdc. This voltage is used to feed the connected transmitters via the multiplexer's

"V" terminals.

The DRA-CSM-1 unit adds about 350Wto the current loop

5.1 MINIMUM SUPPLY VOLTAGE

The minimum supply voltage required to operate the multiplexer and the transmitters

fed by it can be calculated using the following equation:

Vmin = Vt + 0.02*(Rs+350)

The DRA-CSM-1 unit includes three printed circuit cards designated as P.N 7016,

P.N 7017 and P.N 7030.

The printed circuit cards should occupy the slots in the enclosure according to fig1.

c. Disconnect the flat connectors from the front panel.

d. Replace the blown fuse.

Connect the flat cables between the

printed circuit cards and the front

panel. The front panel must be

inserted into the grooves on both

sides of the case while pressing down

until a distinct "click" is heard.

Assembly is completed by laying the

terminal strips in place.

Where:

Vmin - The minimum required supply voltage

- The minimum required voltage specified for the connected

transmitter (at load=0)

Rs - Total loop load including leads' resistance and PLC's input impedance

Example:

The minimum operational voltage of a given transmitter is 12V.

The total loop load is 250W.

Solving the above voltage:

Vmin= 24Vdc

6. CONNECTING THE TRANSMITTERS TO THE MULTIPLEXER

6.1 TWO-WIRE TRANSMITTER

A Two-Wire transmitter is connected

so that its positive terminal is connected

to the "V" terminal, and its negative

terminal is connected to the "I" terminal.

(see fig 2.)

Figure 2.

6.2 THREE-WIRE TRANSMITTER

A Three-Wire transmitter is connected

so that its positive terminal "+V" is

connectedto themultiplexer "V"terminal,

its negative terminal "-V" is connected

to the multiplexer's "COM" terminal and

the current output terminal "Io" is

connected to the DRA-CSM-1 "I"

terminal. (see fig 3).

Figure 3.

6.3 FOUR-WIRE TRANSMITTER

A Four-Wire transmitter is connected

so that its positive terminal is

connected to the "I" terminal, and its

negative terminal is connected to the

"COM" terminal. (see fig 4).

Figure 4.

7. CONTROL

The DRA-CSM-1 unit is controlled via

four address lines and one E/T

(Enable/Test) line. The control terminals

(Address and Enable), were designed

to receive control signals from TTL levels

up to 60V so that almost any PLC's DC

output module can be used. (see fig 5).

Figure 5.

7.1 ENABLE/TEST

The unit is enabled when "E/T" is in logical "0" (low) state. In a disabled state,

the DRA-CSM-1 outputs no current and reflects a Hi-Z state.

The disabled state of the DRA-CSM-1 multiplexer is used to check the functioning

of all the current inputs. This is performed by simultaneously injecting current pulses

to all 16 channels which cause the functioning channels to flash. This is a quick

and useful means to indicate a blown fuse.

7.2 ADDRESS

The required channel is selected by four address lines.

The operating voltage levels are:

"0" state 0V < Vaddress < 0.4V

"1" state 5V < Vaddress < 60V

7.3 ADDRESS POLARITY (see fig 6)

Address polarity is controlled by three

internal pins and a jumper over two of

them, accessible behind the Enable

terminal. The unit is supplied with the

jumper set for "true low" control logic,

i.e. "0000" selects channel #16, and

"1111" selects channel #1.

Moving the jumper to the second

alternative, reverses the logic.

Note: If the PLC and the DRA-CSM-1 are powered by separate power

supplies, then the negative terminals should be connected.

7.4 CONTROL TABLES

7.4.1 "True Low" Setting

7.4.2 "True High" Setting

ADDRESS BUS E/T OUTPUT

CHANNEL

A0A1A2

TEST MODE

ADDRESS BUS E/T OUTPUT

CHANNEL

A0A1A2

TEST MODE

Figure 6.

ADDRESS BUS E/T OUTPUT

CHANNEL

A0A1A2

TEST MODE

ADDRESS BUS E/T OUTPUT

CHANNEL

A0A1A2

TEST MODE

8. MULTI-DROP CONFIGURATION

In the disabled state (E=1), the multiplexer outputs no current and exhibits a high

Z state. This mode allows the connection of several DRA-CSM-1 units to one PLC's

analog input, by tying their output terminals and the address lines in parallel, and

applying individual Enable lines to select the desired multiplexer by disabling all

but one. (see fig 7)

Figure 7

ENABLE 1

MSB

LSB

ENABLE 2

DISCRETE

OUTPUT

MODULE

ANALOG

INPUT

MODULE

PLC

ANALOG +

ANALOG

POWER

SUPPLY

Supply Voltage

Supply Current Consumption

FUSES

Main Fuse

Channel Fuse

TEMPERATURE

Operating

Storage

HUMIDITY

HOUSING

Box

Terminals

WEIGHT

DIMENSIONS

15 - 40 Vdc (regulated)

15mA in operation mode,

120mA in Test mode

(transmitters not included)

630mA, Fast Blow (20x5 mm)

63mA, Fast Blow (20x5 mm)

0 to 70

C (32 to 158

-25 to +85

C (-13 to 185

5 to 95% Relative humidity, non condensing

Plastic Polycarbonate

According to IP50 DIN 40050

According to IP20 DIN 40050

0.75 Kg. (1.5 lb.)

73Hx200Wx121mmD

(2.88"x7.88"x4.76")

INPUTS

ANALOG INPUTS

(Reverse Polarity Protected)

Max Input Current

CONTROL INPUTS

Logic Levels

Logic Polarity

OUTPUTS

CURRENT OUTPUT

Switching time

Accuracy (Refer to Current Input)

"V" TERMINALS

"V" Voltage

Limitation Current

Automatic Temperature Shut-down

INDICATORS

16, 0/4-20mA Current loop

30mA

4 Address inputs

E/T Enable/Test input

Low: "0" < 0.4V

High: 5 < "1" < 60V

Selectable - True High/True Low

4-20mA, Current Loop

10mSec (into a resistive load)

0.01% maximum @ for the entire temperature range

V supply - 2.5V

40 ±1mA

Above 80

1 Yellow LED, Power-On indicator

16 Red LEDs, current activity indicators

9. SPECIFICATIONS

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