I.L. 17562
Page 3
PR 0.3 Effective 8/99
SECTION 1. INTRODUCTION
1.0 General
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. It is frequently installed in motor
starters or switchgear.
The MP-3000 Motor Protection relay provides the following protection, alarm, and control
functions (ANSI device numbers in parentheses):
Protection
• Intel-I-Trip I
2
t Overload Protection (49/51)
• Locked rotor protection (49S/51)
• Ultimate trip current (51)
• Negative sequence current/ phase unbalance protection (46)
• Instantaneous overcurrent trip(50)
• Ground fault protection (50G)
• RTD trip with accessory URTD module (49/38)
• Underload trip (37)
• Starts per time limit (66)
• Jam or stall trip (51R)
• Zero-speed switch trip (14)
• Auto or manual reset (86)
• Fail-safe or non-failsafe trip modes
Alarming
• Ground fault
• I
2
t 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
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