EATON PXQ-ST2-1A1 Quality Analysis System Kit, 700/1200 VAC

2.1.2 Instantaneous Overcurrent Protection

The MP-3000 has an instantaneous phase overcurrent function to trip

the motor for fault currents, sometimes saving the fuses for medium

current faults.  This function can be disabled and has an adjustable

start time delay on starting to avoid nuisance tripping on inrush.

2.1.3 Phase Current Unbalance Protection

Motor supply circuits are often fed through fuses and may be ener

gized with one fuse blown, causing single phasing of the motor.  The

MP-3000 measures the current unbalance and can be used to alarm

or trip the motor before heating and a thermal-model trip.  Pickup, start

and run timers, and separate alarm settings are provided.

2.1.4 Ground fault Protection

A separate monitoring circuit is used to measure ground current.  A

zero sequence ground CT is recommended for more sensitive protec

tion against winding insulation failure to ground.  The relay ground CT

input can be connected residually from the three phase CTs, but with

much inferior protection sensitivity.  The ground fault protection has

adjustable pickup and time delay set points, or it can be disabled.

2.1.5 jam Protection

The User-selectable Jam function protects motors that are running

against a sudden mechanical jam or stall condition.  The common

application is on motors used on crushers, chippers, or conveyors.  It

detects an increase of motor current to a level above full load. Pickup,

start and run timers, and a separate alarm setting are provided.

2.1.6 Underload Protection

The User-selectable underload function is used to detect the loss of

load on the motor.  Coupling failure is a common cause for loss of load.

Pickup, start and run timers and a separate alarm setting are provided.

2.1.7 Remote and Differential Trip

One of the discrete inputs can be programmed to accept a contact

input from a separate differential relay or other device to trip the motor.

This provides local and remote target (logging) information, and utilizes

the trip contacts of the MP-3000.  It also records and logs the motor

information at the time of the trip.  For differential tripping, the Eaton

MD-3000 is recommended.

2.1.8 Zero-Speed Switch Trip

One of the discrete inputs can be programmed to accept a contact

input from a zero-speed switch connected to the motor shaft.  This pro

vides faster tripping for a motor that remains completely stalled when

energized for a start.  It

Catalog Number Description Style Number

MP3011-IC MP-3011 Inner Chassis, 5A CT, No Communications 66D2208G11

MP3012-IC MP-3012 Inner Chassis, 5A CT, with INCOM Communications 66D2208G12

MP3013-IC MP-3013 Inner Chassis, 5A CT, with Modbus Communications 66D2208G13

MP3014-IC MP-3014 Inner Chassis, 5A CT, with DeviceNet Communications 66D2208G14

MP3111-IC MP-3111 Inner Chassis, 1A CT, No Communications 66D2208G15

MP3112-IC MP-3112 Inner Chassis, 1A CT, with INCOM Communications 66D2208G16

MP3113-IC MP-3113 Inner Chassis, 1A CT, with Modbus Communications 66D2208G17

MP3114-IC MP-3114 Inner Chassis, 1A CT, with DeviceNet Communications 66D2208G18

MP3X11-OC MP-3XXX Outer Chassis, for Use with No Communications or INCOM Comminica

tions Inner Chassis

66D2035G01

MP3X13-OC MP-3XXX Outer Chassis, for Use with Modbus Communications Inner Chassis 66D2035G02

MP3X14-OC MP-3XXX Outer Chassis, for Use with DeviseNet Communications Inner Chassis 66D2035G03