EATON MP-3000 Motor Protection Relay

2.8 Startup Control and Limitations

The MP-3000 is equipped with a complete motor start management logic, including:

Allowable startup times/times (ST/T, T/ST): Limit the maximum number of startups within the set time.

Startup Interval Time (TBS): Prevent frequent startups.

Number of cold starts (NOCS): The number of consecutive cold starts allowed.

Anti reverse time (ABK): For pump loads, prevent starting immediately after the motor stops to avoid reverse impact.

When any restriction is triggered, the relay will display the remaining waiting time and prevent restarting after the motor stops.

2.9 Emergency override function

In emergency situations, operators can use the emergency override button on the panel (to be enabled) or remote input to forcibly reset all startup restrictions and clear the thermal model bucket, allowing for immediate restart of the motor. This operation will be recorded in the event log and may cause damage to the motor. It should only be used in emergency situations that endanger personnel or equipment.

2.10 Disarmament Mode

This mode allows the relay to be placed in the "disarmed" state during operation, while all protection functions are still running internally. The tripping conditions will be displayed and recorded, but the tripping relay will not operate. This is very useful for debugging new relays or new settings in key processes, and can observe the protection behavior without interrupting production.

Technical specifications and hardware features

3.1 Power Supply and Control

Rated voltage: 120 Vac or 240 Vac (automatic adaptation), allowable fluctuation range -25%/+10%.

Power consumption: Maximum 24 VA (body), URTD module 6 VA, IPONI 1 VA.

Voltage sag tolerance: It can still operate continuously at 55% of the rated voltage, and can maintain 13 cycles (60 Hz) after complete power loss.

3.2 Current input

Rated current: 1 A or 5 A (depending on the model).

Thermal endurance: 2 times rated continuous, 50 times rated 1 second.

Accuracy: Phase current ± 1% of I1 (0~I1) or ± 1% reading (above I1); The accuracy of grounding current is slightly lower.

3.3 Output contacts

4-channel Form C (1NO+1NC) contacts: trip, alarm AUX1、AUX2， Programmable (except for trip relays).

Contact capacity: 5 A @ 120/240 Vac, 0.25 A @ 250 Vdc resistive load.

3.4 Discrete Input

2-channel programmable 120 Vac input, configurable for remote reset, remote tripping, differential tripping, motor stop detection, reset disable, emergency override, zero speed switch, incomplete sequence feedback, etc.

3.5 Analog Output

4~20 mA programmable output, selectable to represent average phase current (0~100% FLA or 0~125% FLA), I2t thermal capacity percentage, or maximum winding temperature. The maximum load is 1 k Ω.

3.6 URTD module

Communication method: plastic fiber optic (recommended) or three wire electrical connection.

RTD type: 10 Ω copper, 100/120 Ω nickel, 100 Ω platinum.

Maximum distance: Fiber optic 400 ft (122 m), electrical 500 ft (152 m).

3.7 Environment and Certification

Working temperature: -20 ° C to+60 ° C.

Storage temperature: -45 ° C to+85 ° C.

Humidity: 0~95% without condensation.

Standards: Compliant with ANSI/IEEE C37.90, UL 1053, CE (EMC), etc.

Operation panel and user interface

The front panel design of MP-3000 is intuitive and easy to use, including:

4-line alphanumeric display screen: displays status, measurement values, settings, and logs.

Mode buttons: Monitor, view settings, history, logs, corresponding LED indicators.

Navigation buttons: page up and down, line up and down, numerical addition and subtraction, help to quickly navigate.

Reset button: Clear the trip status and exit programming.

Help button: Display help information for the current screen.

Protection door: The lower small door contains programming buttons and emergency override buttons, which can be sealed with lead to prevent unauthorized operation.

Installation and wiring

5.1 Mechanical Installation

MP-3000 adopts semi embedded installation, with hole size fully compatible with IQ 1000 II, making it easy to replace directly. The optional Quick Release Drawout Case allows for quick replacement of relays without disconnecting wiring, and the CT circuit has a self short circuit function to ensure safety.

5.2 Electrical wiring

CT wiring: It is necessary to pay attention to polarity and phase sequence, and it is recommended to use short and thick wires to reduce saturation effects. The grounding CT should use a magnetic balance CT, with three phase wires passing through simultaneously.

Output contacts: Trip relays are usually connected in series in the contactor coil circuit; Alarm, AUX1, and AUX2 can be freely configured according to the application.

Power supply: Connect to terminal 4 and automatically adapt to 7120 Vac or 240 Vac.

Discrete input: Using a 120 Vac signal, wet power can be provided by internal terminal 6.

URTD module: Priority is given to using fiber optic communication, with strong anti-interference ability. RTD wiring adopts a three wire shielded cable, with the shielding layer grounded at one end.

Communication and System Integration

MP-3000 supports multiple communication protocols and is implemented through the optional PONI (Product Operation Network Interface) module