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ABB D685A1156U01 electromagnetic flowmeter control unit motherboard

From: | Author:Wang | Time :2024-11-28 | 63 visit: | Share:

THEORY OF OPERATION

Triplicated data enters and leaves the module (Figure 2-3 ) via the chassis backplane

connector J1 and is isolated from the MPP by bus transceivers. Data for transmission is

loaded into dual port RAM in each of the three circuit branches and is voted 2-oo-3 before being

passed to the USARTs on the daughter board where it is serialised and sent to the appropriate

communications port.

Data received at the ports is converted to parallel form by the USART and written to dual port

RAM in each branch, the data is accompanied by information about the status of the ports and

the embedded microprocessor. The dual port memory is then read by the MPP via a second

set of transceivers.

The four communications ports are configured to run in full duplex mode using an RS232

interface and having a maximum rate of 19200 Baud. The communications ports are isolated

from the module circuits by opto-isolators and connected to field connector J2 at the rear of the

module. The ports are capable of powering modems or line drivers for transmission over long

distances.

Power for the module circuits is derived from the dual redundant SC300E power supply units,

individual auctioneering and regulating circuits supplying various logic areas. The

communications port opto-isolators and interfaces also have separate supplies.

SCOPE

CAUTION: 1

The module contains components that may be electrostatically sensitive, it should be

transported and stored in its original packaging material.

System repair is by module replacement. Faulty modules are not repairable in the field; they

should be returned for repair.

DIAGNOSIS

The TriBuild workstation is used for fault diagnosis. In the case of an Input/Output fault the

Health LED on the faulty module will be extinguished.

REMOVAL AND REPLACEMENT

CAUTION 2

Failure to take the faulty module off-line before removing it from the chassis could trigger a fault

alarm or cause plant shutdown.

CAUTION 3

When inserting a module ensure that it is aligned with the markings on the chassis rails and

that it engages with the upper and lower guides. Improper insertion may cause damage to the

module and/or chassis connectors.

Operate the On/off Line Request switch on the faulty module, the three On Line LEDs should

all extinguish to indicate that the MPPs have recognised the request and taken the module offline.

Slacken the two module securing screws and use the black ejection levers (top and bottom) to

draw the module from its slot.

Insert the new module ensuring that it engages properly in the upper and lower guides in the

chassis, the top and bottom chassis rails carry alignment marks to assist. Pull out the

ejection levers and as the module is pushed back engage the levers on the chassis rails. The

levers should then be used to draw the module into position, some resistance will be felt as the

rear connector pins engage. The module should be fixed in position with the securing screws.

Triguard SC300E

Operate the On/off Line Request switch and check that the three On Line LEDs illuminate for

one second, extinguish for one second and then illuminate permanently to indicate that the

module has been put on-line. If the LEDs do not illuminate either the first or second time or fail

to remain illuminated, then the module must be considered faulty.

PREVENTIVE MAINTENANCE

No preventive maintenance is necessary

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