Eaton MP-3000 Motor Protection Relay Guide

Important note: The URTD module can only be powered by 120 Vac. If using 240 Vac, URTD needs to be equipped with a step-down transformer (6 VA load).

6.8 Discrete Input Wiring

Discrete inputs can only be powered by 120 Vac. Terminal 6 always provides 120 Vac power, which can be used to wet remote contacts.

Discrete input circuits are completely isolated from other circuits and have their own common terminal (terminal 9).

Capacitor limitation: The total capacitance of parallel capacitors connected to discrete input contacts or solid-state relays should be less than 0.05 microfarads, otherwise charging current may cause false indication.

Chapter 7 Startup and Debugging

7.1 Pre power on inspection

Disconnect the MP-3000 control power supply

Confirm that there are no other power sources reversing the power supply

Check if the wiring meets the design requirements

Confirm that the CT secondary rating is consistent with the MP-3000 CT input rating (5A or 1A)

7.2 First power on inspection

Disconnect the power cord from terminal 4 and disconnect the URTD power plug

Measure the voltage between terminals 4 and 7 and confirm 120 or 240 Vac

Measure the voltage between terminals 6 and 7, which should be around 120 Vac

Check the discrete input status

Confirm that there is 120 Vac at the URTD power plug

7.3 Setting Input

Use Table 4.3 as the worksheet record setting selection

Pre configured settings files can be downloaded through PowerNet or PowerPort

Or manually input through the front panel programming mode

After exiting programming mode, verify that the settings are entered correctly

7.4 Contact Output Test

Confirm the mode settings of each output relay (P12L1-P12L4)

Enter programming mode and navigate to Page 13 SP TEST

Test each relay using P13L2-P13L5

Press the Reset button to switch the relay state

7.5 Complete System Testing

Reconnect the contactor to terminal 12

Confirm that all rotating components and transmission mechanisms are securely connected

Remove foreign objects from the surrounding area

Ensure that the MP-3000 Protection LED is on and displays READY-3

starter motor

Measure the current of each phase using a clamp ammeter and compare it with the displayed value of MP-3000 (within 5% error)

Chapter 8 Load Shedding Function

8.1 Functional principle

The load shedding function is used to send signals to process equipment when the motor is overloaded, reducing the load and avoiding stalling or thermal overload tripping. For example, the transportation of heavy objects to the conveyor can be temporarily stopped and restored after the load is reduced.

8.2 Parameter Setting

Setting description

P9L1 LSPU load rejection suction current 50-150% FLA, activate output when current exceeds this value

P9L2 LSDO load shedding release current 50-LSPU%, release output when current is lower than this value

P9L3 LSDL load shedding delay 0-5 seconds, shared by suction and release

Compulsory relationship:

If any one is set to OFF, the other will automatically be set to OFF

If LSPU is set and LSDO is OFF, LSDO will automatically be set to the minimum value of 50% FLA

If LSDO is set and LSPU is OFF, LSPU will automatically be set to the maximum value of 150% FLA

LSPU must be greater than LSDO

8.3 Application Examples

The load shedding function activates the AUX1 relay, which can be connected to the process control system. When the motor load exceeds LSPU and continues for LSDL time, the AUX1 contact will activate and stop adding load to the process. When the current is lower than LSDO and lasts for LSDL time, the AUX1 contact is released to restore the load.

Chapter 9 Emergency Bypass Function

9.1 Function Description

The emergency bypass function allows for forced restart of tripped motors in emergency situations without completely disabling protection. When receiving a bypass request:

Drain the heat accumulator to an initial level of 40 ° C

Reset the startup limit counter and timer (including anti reverse timer)

Cold start count fully restored

The motor protection is restored to the state after the motor has been stationary for a long time

9.2 Enabling Method

The emergency bypass function can be triggered in three ways:

Emergency Override button behind the front panel protective door (requires P12L7 to be set to EMRG EN)

Discrete input contacts configured as EMG OVR

Data communication commands for PowerNet host

9.3 Important Warning

The emergency bypass function will clear and restart all protection functions of MP-3000. Using this function may damage the motor. Only for use in truly emergency situations, and the reason for tripping must be clearly identified. Using a bypass means bearing the risk of motor damage to avoid more dangerous process states caused by tripping.

Chapter 10 Communication and Network Integration

10.1 PONI module selection

MP-3000 supports multiple PONI (Product Operation Network Interface) modules:

Type description

I-PONI INCOM network PONI, connected to a robust INCOM communication network

RS-485 PONI Modbus RTU communication, standard RS-485 network

D-PONI DeviceNet communication, 125/250/500 kilobaud

E-PONI Ethernet PONI, 10BaseT or fiber optic network connection

10.2 PONI Installation and Connection