Eaton MP-4000 motor protection

Product description

• Microprocessor-based, multifunctional

motor protection

• Intel-I-Trip overload protection based on

motor data

• Event recording and operational logging

• Motor start profile

• Optional quick release drawout case

• Used on AMPGARD and medium

voltage assemblies

• “Help” menu provides user

operational assistance

Application description

The Cutler-Hammer MP-4000 motor protection

relay by Eaton Corporation is a multifunctional

microprocessor-based protective relay for the

protection of three-phase AC motors. The

MP-4000 motor relay may be applied to any size

motor at any voltage level. It is most commonly

used on large, medium voltage three-phase induc

tion motors. It has also been widely used on

important low voltage (480V) motor applications

and synchronous motors.

The MP-4000 motor relay monitors three-phase

and ground currents and three-phase voltages.

It provides motor overload, stall, short circuit,

phase unbalance, single phasing over/undervolt

age, underpower, power factor, and ground fault

motor protection.

It can also be used to provide protection for a load

jam or loss of load condition.

The MP-4000 motor relay provides start control

logic to protect the motor against excessive starts

or starting the motor before it has had sufficient

time to cool down. The MP-4000 motor relay

may be applied to either across-the-line starters

or reduced-voltage starters. On reduced-voltage

starters, the MP-4000 relay can control the switch

from reduced voltage to full voltage based on time

and/or motor transition. The MP-4000 can protect

the starter against failure to transition to full volt

age through contact feedback and an incomplete

sequence function.

MP-4000 motor relay

The MP-4000 motor relay is generally used on

a motor starter or a breaker used for a motor

load. The MP-4000 motor relay provides the

intelligence to protect and control the motor

against abnormal operating conditions. It monitors

the currents from either a 5A or a 1A secondary

of a CT circuit. Ground current may be obtained

from either a ground CT or from the residual

connection of the phase CTs. It provides a Form C

contact output for controlling the starter contacts

or breaker operation.

The protection functions are listed below:

• I2t overload protection (49/51)

• Locked rotor (49S/51)

• Ultimate trip current (51)

• Current unbalance (46)

• Instantaneous overcurrent (50)

• Ground fault protection (50G)

• Undervoltage (27)

• Overvoltage (59)

• Under power (32)

• Voltage unbalance (47)

• Power factor (55)

• RTD trip and alarm with URTD module (49/38)

• Underload trip (37)

• Starts per time (66)

• Jam or stall (51R)

• Auto or manual reset (86)

• Fail-safe or non-fail-safe trip modes

The metering functions are:

• Metering:

− Average current (I Ave)

− Amperes: magnitude and angle in primary values

− Amperes: positive, negative, and zero sequence

− Average voltage (V Ave)

− Voltage: magnitude and angle

− Voltage: positive, negative, and zero sequence

− Percent of full load

− Percent current unbalance

− Percent voltage unbalance

− Power, vars, and VA

− Power factor

− Frequency

− Energy metering with time and date stamps

• RTD temperatures:

− Individual winding

− Motor bearing

− Load

− Auxiliary temperatures

• Motor conditions:

− Percent of I2t thermal bucket

− Time before start

− Remaining starts allowed

− Oldest start time

Features, benefi ts, and functions

• Complete motor protection and control in a single compact case

reduces panel space requirements and wiring costs

• Microprocessor design with self diagnostics eliminates calibration

and reduces installation, commissioning, and maintenance

• Programmable stop 2–20% of PCT

• Intel-I-Trip overload protection develops customized curve from

manufacturer’s supplied motor data

• Intel-I-Trip overload protection provides adaptive trip characteris

tics based on motor temperature when motor RTDs are

connected through an optional URTD module

• Meets UL 1053 ground fault protection standards that eliminates

the need for a separate ground relay saving cost, space, wiring,

and time

• Voltage dip/loss ride through capability reduces unnecessary trips

caused by poor power quality

• Motor currents, temperatures, and conditions are monitored and