Eaton MP-3000 Motor Protection Relay
The MP-3000 is an advanced microprocessor-based motor protection
relay that is easy to set up and use. It monitors, controls, and protects
motors against overload, thermal damage to rotor or stator, electrical
faults, and excessive starting, and many process equipment failures.
Advanced algorithms and thermal models give safe operation over a
wide range of conditions.
The MP-3000 protects 50 or 60 Hz three-phase motors of any size
or voltage level. It can protect induction or synchronous motors, with
or without RTDs. The relay is frequently installed in motor starters or
switchgear.
The MP-3000 Motor Protection Relay provides the following pro
tection, alarm, and control functions. ANSI device numbers are in
parentheses.
Protection
Intel-I-Trip I2t Overload Protection (49/51)
Locked-rotor protection (49S/51)
Ultimate trip current (51)
Negative sequence current/phase unbalance and reverse
phase protection (46)
Instantaneous overcurrent trip (50)
Ground fault protection (50G)
RTD trip with accessory URTD module (49/38)
Underload trip power and current (37)
Starts per time limit (66)
Jam or stall trip (51R)
Zero-speed switch trip (14)
I2t Auto or manual reset (86)
Fail-safe or non-fail-safe trip modes
alarming
Ground fault
I2t Overload
Jam / Stall
Underload
Phase unbalance
RTD temperature with URTD module
Control features
Transition control for reduced voltage starters
Incomplete sequence (process feedback) detection and trip
Permits user-set number of cold starts
Limits number of starts per time
User sets minimum time between starts
Antibackspin (time from stop to next start) delay
Current-based process load shedding and restoration
Long acceleration timing feature
Motor stop input for synchronous motor and condenser
applications
Remote trip input
Differential trip input
Emergency override clears blocks to motor restarting (if
enabled)
Program settings while motor runs, with controlled change
over (if enabled)
Disarmed mode for commissioning and checking in a
running process
MP-3000 features and Enhancements
The MP-3000 Motor Protection Relay incorporates the field proven
motor thermal models and sequence component measurement
techniques that were pioneered in the IQ 1000 II relay thermal models.
The MP-3000 also adds several enhancements. Significant enhance
ments and features include:
1. Recognized to meet UL 1053 Standards for Ground Fault Protec
tion Devices.
2. Power supply operates continuously at 55% of nominal supply
voltage. It can ride through a voltage sag or loss for 30 cycles
without dropping out and taking the motor off line.
3. Optional Quick Release Drawout Case that makes removal and
replacement fast and easy.
4. New Armed/Disarmed feature for trip-free installation with Quick
Release Drawout Case.
5. User selectable trip or alarm only on relay internal failure detec
tion.
6. Real-time clock for date and time stamping of trips, alarms, and
events (Y2K compliant).
7. Expanded memory for extensive recording and logging of events,
trips, alarms, history, and motor starting current profiles.
8. Motor starting profile plot versus protection limits.
9. Easy-to-use faceplate and user interface. Settings and data are
organized into pages under six main modes. The modes are
Default (motor state), Monitor, View Setting, History, Logs, and
Program (change settings).
10. intel-i-trip Intelligent Overload Protection with adaptive trip char
acteristics based on RTD readings and motor operating history.
11. RTD diagnostics and communications error checking for addi
tional security against operation from RTD failures.
12. Mechanical Process Load Shedding feature provides overload
indication to control upstream processes, averting unnecessary
motor overload shutdown or jam trips, and maintaining process
continuity