Protection Relays and Controls

© 2017 Littelfuse Protection Relays & Controls

Littelfuse.com/mps

Motor Protection–Advanced

PHASE

VOLTAGES

MPS-CTU

CONTROL UNIT

RELAY

OUTPUTS

I/0 MODULE

DIGITAL

INPUTS

4-20 mA

ANALOG

INPUT

+

ANALOG

OUTPUT

4-20 mA

+

39

40

53

52

43

51

......

5

16

......

1

2

60

56

20

17

......

33

22

CONTROL

POWER

RS-485

35

37

......

30 29

27

26

23

22

PHASE CURRENT

TRANFORMERS

GROUND-FAULT

CURRENT

TRANSFORMER

OPERATOR

INTERFACE

MPS-OPI

(recommended)

(required)

(required)

MPS-RTD

RTD MODULE

(optional)

(optional)

MPS-DIF

DIFFERENTIAL

MODULE

Wiring Diagram

A

B

C

D

1

2

Specifications

Protective Functions

(IEEE Device Numbers)

Input Voltage

65-265 Vac, 25 VA; 80-275 Vdc, 25 W

Power-Up Time

800 ms at 120 Vac

Ride-Through Time

100 ms minimum

24-Vdc Source

100 mA maximum

AC Measurements

True RMS and DFT, Peak, 16 samples/cycle, and

positive and negative sequence of fundamental

Frequency

50, 60 Hz or ASD

Inputs

Phase current, Earth-leakage current, Phase voltage,

7 digital, tachometer, 1 analog

Output Contacts

5 contacts — See Product Manual

Approvals

CSA Certified, RCM (Australian), UL Recognized

Communications

Conformally Coated

Standard feature

Warranty10 years

Mounting

(Control Unit)

Surface

(Operator Interface)

Panel, Control-Unit mounted

Overload (49, 51)

Phase reverse (current) (46)

Overfrequency (81)

Overcurrent (50, 51)

Jam

Underfrequency (81)

Ground fault (50G/N,

51G/N)

Undercurrent (37)

Unbalance (voltage) (47)

Failure to accelerate

RTD temperature (38, 49)

Unbalance (current) (46)

Underspeed (14)

Starts per hour (66)

Phase loss (voltage) (47)

Overvoltage (59)

Differential (87)

Phase loss (current) (46)

Undervoltage (27)

Phase reverse (voltage) (47)

Power factor (55)

Features & Benefits

FEATURES

IEEE #

BENEFITS

Overload

49, 51

Extends motor life and prevents insulation failures and fires

Current unbalance/

Phase loss/Phase reverse

46

Prevents overheating and extends motor life

Overcurrent/Jam

50, 51

Prevents catastrophic failures and fires and extends motor life

Undercurrent

37

Detects low-level or no-load conditions

Ground fault

50G/N, 51G/N

Prevents catastrophic failures and fires

RTD temperature

38, 49

Optional RTD temperature protection (MPS-RTD module) for

high ambient or loss of ventilation protection

Overvoltage

59

Prevents stress to insulation

Undervoltage

27

Prevents a start attempt when it will damage the motor

Voltage unbalance

47

Detects unhealthy supply voltage

Phase differential

87

Provides sensitive protection for high-resistance winding faults

Dynamic thermal mode

Provides protection through starting, running, overload, and cooling cycles

Reduced overcurrent mode

Minimizes Arc-Flash hazards during maintenance

Starter control

Simplifies the installation by reducing component count

Metering

Displays the measured and calculated motor parameters

Data logging

On-board 64-event recorder helps with system diagnosis

Communications

Remotely view measured values, event records & reset trips

Conformal coating

Internal circuits are conformally coated to protect against corrosion and moisture

MPS SERIES (PGR-6300)

Motor Protection System

Rev: 4-B-061517

Based on Manual Rev: 6-F-022117