Eaton 66D2032G01, Manual

Page: 7 / 123

I.L. 17562
Page 7
PR 0.3 Effective 8/99
SECTION 2. PRODUCT OVERVIEW
2.0 General Overview
The MP-3000 Motor Protection Relay is available in either a fixed mount, semi-flush case or in a
semi-flush Quick Release drawout case. Both housings are compact and fit a standard IQ cutout.
The optional Quick Release drawout case features 2-stage contact disconnects and self-shorting
Ct circuit terminal blocks. A spare self-shorting terminal pair is available for use as relay removal
alarm, or to keep the contactor energized for continuous motor operation on relay removal. The
optional communication module (PONI) is externally mounted on the fixed mount case and
internally mounted in the drawout case.
The MP-3000 has three phase current inputs and one ground current input. Both 5 A and 1 A
versions are available. The ground protection and metering functions are best used with a zero-
sequence ground Ct, rather than from the residual connection of the phase Cts - the zero
sequence ground Ct provides greater ground fault sensitivity. The unit is user programmable for
60 Hz or 50 Hz operation.
The MP-3000 has 2 discrete inputs, 4 form c (1 N.O. and 1 N.C.) output contacts, and one 4 to
20 ma analog output. The relay lets the user program the operation of all the I/O points except
for the trip output. In addition, the relay has 10 LED’s for the indication of protection on, program
mode, monitor mode, view setting mode, history mode, log mode, trip, alarm, Aux 1 and Aux 2
output relay operation. A test page in the program mode provides display indication of the
discrete input states and testing of the output relays, target LED’s and analog output circuit.
A user-friendly operator interface provides quick access to the settings, monitored values, motor
history and operational logs. A large LED alphanumeric display provides easy viewing from any
angle. Simple keypad operations provide quick and easy navigation through all settings and
stored data. The program mode and emergency override buttons are access restricted via a
seal and latched cover. An integrated context-sensitive help button provides an online
descriptive display of functions, abbreviations and operations.
2.1 Optimum Motor Protection
The MP-3000 Motor Protection Relay has been designed for maximum motor utilization and
protection. It is desirable to run the motor as close as possible to its design limits, while
protecting it against excessive heating and damaging overload conditions. The MP-3000 has
field proven protection algorithms developed from basic motor design principles and operating
parameters
The MP-3000 protects against rotor and stator overheating, short circuits or insulation faults,
excessive starting duty, and abnormal operating conditions.
2.1.1 Intel-I-Trip (Adaptive I
2
t Motor Overload Protection)
Motor operation is typically limited by the rotor thermal capabilities, but the measuring quantities
are stator currents. This requires accurate measurements and good motor thermal models to
provide maximum utilization and reliable protection.
The MP-3000 uses the field-proven Intel-I-Trip overload measurement and motor thermal
protection model that uses the manufacturer’s nameplate data to develop an overload protection
curve specifically for the motor being protected. When RTDs are used, the Intel-I-Trip overload
protection curve becomes adaptive. The overload trip times will change based on the modeling
impact of the motor’s internal temperature data. It also trips directly for high stator temperature.