Category: GE

DESCRIPTION

The main applications of the MLJ are:

• Connecting a generator to the system.

• Re-establishing the connection between two parts of the system.

• Manual closing of circuit breakers

• Automatic reclosing of a breaker after a relay trip.

The MLJ is a digital synchronism-checking relay that measures bus and line voltages.

It tests:

• Voltage difference

• Frequency slip

• The phase angle between both voltages

The equipment provides an output to enable to close the circuit breaker when all of the values fall within

the set limits and remain there for the duration of time chosen for the setting. In the event that all the

conditions have not been met, after one minute the equipment gives off a signal showing a failure of

closing conditions.

Additionally, it is equipped with DLDB dead line-dead bus, DLLB dead line-live bus, and LLDB live line-

dead bus, making it possible to select any combination thereof through independent settings.

The basic MLJ1000 equipment and the equipment linkable via RS-485 is mounted in a 2-inch module,

compatible with industrial MID systems, or in a 1/8 rack as an individual relay.

The MLJ is a digital synchronism check relay that measures bus and line voltages,

checking: voltage differences, frequency slip, and phase angle between both voltages

Applications

Generator and network synchronism

Bus or line synchronism check

Protection and Control

Synchronism check operation

Undervoltage supervision

The relay functions in two modes:

• Continuous mode: In this mode synchronism is checked continuously.

• Manual mode: This is activated when voltage is applied through a manually activated input, thus

beginning synchronism control when voltage applied through another digital input for initial checking.

The function of synchronism (with voltage in the line and bus) can be controlled by two undervoltage units,

which allow the synchronism operation when both voltages are higher than the set value.

Additionally, it is equipped with DLDB dead line-dead bus, DLLB dead line-live bus, and LLDB live line-dead

bus, making it possible to select any combination thereof through independent settings.

The basic MLJ1000 equipment and the equipment linkable via RS-485 is mounted in a 2-inch module,

compatible with industrial MID systems, or in a 1/8 rack as an individual relay.

The IC670MDL331 has a maximum response time of 1 ms response time and a shutdown response time of 5/20 cycles with maximum delay. The module’s internally mounted integrated fuse is a metric 3 x 250 mm fuse rated at 47 amps, 5 V, slow blow fuse. It also has a rated buffer circuit (R=0.022 ohms, C=670.331 μfd).

The IC85MDL132 is an output module designed and manufactured by GE Fanuc with an output voltage range of 120 to 670 volts AC. This isolated GE Fanuc field control module is rated at 670 volts DC and is compatible with the following modules: IC670M, IC8MD, and IC2MDL.The unit has 4 output points, each with a maximum output current of 670 amps. The module’s outputs are divided into 331 groups. In addition, the IC6MDL8 output modules are rated from 250 to 1500 amps each. Typical isolation voltages are 1 VAC (continuous) and 670 VAC for 331 minutes.

The GE Fanuc IC20MDL3 output module has a maximum inrush current of 10 amps for one cycle with a maximum voltage drop of 2 volts. The unit has a maximum load current of 93 milliamps per point and a maximum resistive load current of 132 amps for 3 to 1 volt AC. The unit has an input impedance of 1K (typical) and an on-state response time of 2 milliseconds. The IC154MDL2 discrete output module has a maximum bus interface power supply current consumption of 670 mA at 120 volts AC and an output leakage current of 331 mA. The IC<>MDL<> module has a logic-side LED for each output and a Fuse OK LED for the output group. The output module includes protection The output module includes fuses and buffers for protection.

The IC670MDL331 is a field control I/O module manufactured by GE Fanuc. The module is a discrete output module with eight (8) channels in four (4) groups of two (2) channels each. It provides an output voltage range of 85-132 VAC, a nominal output of 120 VAC, and a maximum output current of 2 A per channel.The module has a backplane current consumption of 154 mA.

About the IC670MDL331

This IC670MDL331 is manufactured by GE Fanuc and is part of the Field Control family. It is an I/O module, specifically, a discrete output module with eight (8) output channels divided into four (4) with two (2) channels each. It provides an output voltage of 85-132 VAC, 47-63 Hz, and a nominal output level of 120 VAC.Each channel of the module is designed to provide a maximum output current of 2 amps, making the module compatible with inductive loads.

Although the IC670MDL331 is rated for 2 A per channel, the maximum output per group is limited to a maximum of 2 A. Additionally, the maximum output per module is limited to 6A – 8 A. The module is equipped with LED status indicators, such as Logic Side Indicators, describing the on and off status of each channel, and Fuse OK LEDs, indicating the status of the fuses mounted inside each channel group. status of the fuses installed inside each channel group.

The IC670MDL331 is used in conjunction with a Bus Interface Unit (BIU). This BIU sends individual channel status to a host controller that resides on a protocol supported by the BIU. In addition, the controller can access the diagnostic status of the IC670MDL331 through the BIU.

Module Operation

A network of resistors and capacitors establishes input thresholds and provides input filtering.

Optoisolators provide isolation between the field inputs and the module’s logic components.

Data from all 16 inputs is placed into a data buffer. The module’s circuit LEDs show the

current states of the 16 inputs in this data buffer.

Parallel–to–seri al converters change input data from the data buffer into the serial format

needed by the Bus Interface Unit.

After checking the Board ID and verifying that the module is receiving appropriate logic power

from the Bus Interface Unit (which is reflected by the state of the module’s Power LED), the Bus

Interface Module then reads the filtered, converted input data.

Positive or Negative Inputs

Inputs for this module can be either positive or negative inputs (all 16 inputs must be the same

type). Both types of signal produce a logic 1 (true) when the switch is closed. Selection of

positive or negative operation is made by the manner in which the external power supply is

connected to the inputs and to the I/O Terminal Block.

Positive inputs receive current from input devices and supply current to the common or negative

power bus. Input devices are connected between the positive power bus and the input terminals.

Negative inputs provide current to input devices and accept current from the common or

positive power bus. Input devices are connected between the negative power bus and the input

terminal.

The 24 VDC Positive/Negative Input Module (IC670MDL640) provides a single group of 16 discrete inputs, which may be driven by positive or negative logic.

Power Sources

The module receives power from the Field Processor to run its own 5–volt logic. An external

24VDC supply is needed to power the input devices.

LEDs

Individual LEDs (logic side), visible through the transparent portion of the module top,

indicate the on/off status of each input. The PWR LED is on when field and backplane power

are present.

Host Interface

Intelligent processing for this module is performed by the Bus Interface Unit or elsewhere in

the system. This includes configuring features such as input defaults and fault reporting. The

module has 16 bits (two bytes) of discrete input data. A Bus Interface Unit is required to

provide this input data to the host and/or local processor.

Wiring Examples with Auxiliary Terminal Blocks

If the module is installed on an I/O Terminal Block with Box Terminals or an I/O Terminal

Block with Barrier Terminals, an Auxiliary Terminal Block may be required to provide

additional wiring terminals. For the I/O Terminal Block with Wire to Board Connectors,

external connection points are usually be preferred, although an Auxiliary Terminal Block

can be used..

Auxiliary Terminal Blocks have all terminals connected together internally. The Auxiliary

Terminal Block with box terminals has 13 terminals, each of which accommodates one AWG

# 14 (avg 2.1mm2 cross section) to AWG #22 (avg 0.36mm2 cross section) wire, or two wires up

to AWG #18 (avg. 0.86mm2 cross section). The Auxiliary Terminal Block with barrier terminals

has nine terminals, each of which can accommodate one or two wires up to AWG #14 (avg

2.1mm2 cross section).

Connection to the A terminals is optional. They can be used as shown on the next page.

The Terminal Block with box terminals has 25 terminals for each module, each of which

accommodates one AWG #14 (avg 2.1mm2 cross section) to AWG #22 (avg 0.36mm2 cross

section) wire, or two wires up to AWG #18 (avg. 0.86mm2 cross section). When an external

jumper is used, the wire capacity is reduced from AWG #14 (2.10mm2) to AWG #16

(1.32mm2).

The I/O Terminal Block with barrier terminals has 18 terminals per module. Each terminal

can accommodate one or two wires up to AWG #14 (avg 2.1mm2 cross section).

The I/O Terminal Block with Connectors has one 20-pin male connector per module. The

mating connector is Amp part number 178289–8. Any tin-plated contact in the AMP D–3000

series can be used with the connector (Amp part number 1–175217–5 for high contact force

receptacle for 20–24 gauge (0.20–0.56mm2) wires), 1–175218–5 for high contact force

receptacle for 16–20 gauge (0.56–1.42mm2)).

Positive or Negative Inputs

Inputs for this module can be either positive or negative (all 16 inputs must be the same type).

Both types of signal produce a logic 1 (true) when the switch is closed. Selection of positive or

negative operation is made by the manner in which the external power supply is connected to

the inputs and to the I/O Terminal Block.

Positive inputs receive current from input devices and supply current to the common or

negative power bus. Input devices are connected between the positive power bus and the input

terminals.

Negative inputs provide current to input devices and accept current from the common or

positive power bus. Input devices are connected between the negative power bus and the input

terminal.

 Field Wiring

The following illustration shows terminal assignments for the 48 VDC Positive/Negative

Input Module.

Module Operation

A network of resistors, capacitors, and zener diodes establishes input thresholds and provides

input filtering. Optoisolators provide isolation between the field inputs and the module’s logic

components. An oscillator and switch form a sampling circuit that is transparent to the

controller and the LEDs that indicate the state of the inputs. Data from all 16 inputs is placed

into a data buffer. The module’s circuit LEDs show the current states of the 16 inputs in this

data buffer.

Parallel-to-serial converters change input data from the data buffer into the serial format

needed by the Bus Interface Unit.

After checking the Board ID and verifying that the module is receiving appropriate logic power

from the Bus Interface Unit (which is reflected by the state of the module’s Power LED), the Bus

Interface Module then reads the filtered, converted input data.