Littelfuse MPU-32 User Manual
Protection Relays & Controls
Motor Protection–Advanced
MPU-32 SERIES (PGR-6200)
Motor Protection Unit
1
2
Simplified Circuit Diagram
PHASE CT
A
PHASE CT
MPU-CIM
(Current Input Module)
MPU-32
L1
L2
(Motor Protection Relay)
PHASE CT
GF CT
2
1
B
MPS-RTD
(Temperature
Input Module)
M
RTD x 8
C
Description
The MPU-32 Motor Protection Unit is used to provide currentand temperature-based protection, metering, and data logging
for three-phase low-voltage medium-horsepower induction
motors. This relay is ideal for retrofitting and upgrading obsolete
or aging motor protection using existing CTs. See the PMA
Family of Panel Mount Adapter Kits to replace common
obsolete relays.
1
Motor Protection Unit
g
Three ac-current inputs
g
Earth-leakage-CT input
g
Programmable digital input
g
24-Vdc source for digital input
g
Programmable 4-20-mA analog output
g
On-board temperature-sensor input,
g
100-Ω-Platinum RTD or PTC
g
Three programmable output relays
g
Local RS-232 communications, optional Network Communications
g
PC-interface software (SE-Comm-RIS)
g
4 line x 20 character backlit LCD display
g
Keypad for programming and display selection
g
4 LEDs; 1 user programmable
2
Current Input Module (MPU-CIM)
The MPU-CIM Current Input Module is the interface between
the MPU-32 relay and the 5-A-secondary, 1-A-secondary, and
sensitive current transformers. The MPU-CIM is ordered
separately from the MPU-32 and can be surface- or DIN-rail
mounted. Wire-clamping terminals are standard but the MPU-CTI
is available for those who require ring-tongue terminals.
Accessories
A
Phase Current Transformers
Phase CTs are required to detect phase
currents. For upgrade applications, existing
CTs can be used.
Ordering Information
ORDERING NUMBER COMMUNICATION
MPU-32-00-00 TIA-232
MPU-32-01-00 TIA-232 & TIA-485
MPU-32-02-00 TIA-232 & DeviceNet™
MPU-32-04-00 TIA-232 & EtherNet/IP™ & Modbus® TCP
NOTE: One of the following is required: MPU-CIM-00-00 Current Input Module, or
MPU-CTI-RT-00 Current Input Module with ring-tonque terminals.
ACCESSORIES REQUIREMENT
Phase CTs Required
MPS-RTD-01-00 Optional
MPS-DIF-01-00 Optional
MPU-32-SMK Optional
CA-945 Optional
MPU-16A-Y92A-96N Optional
© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/mpu-32
B
Ground-Fault Current Transformer
Optional zero-sequence current transformer detects
ground-fault current. Available with 5-A and 30-A
primary ratings for low-level pickup.
C
MPS-RTD Temperature Input Module
Optional module provides 8 inputs to connect
Pt100, Ni100, Ni120, and Cu10 RTDs.
D
MPS-DIF Differential Current Module
Optional motor differential protection,
compatible with core balance and summation
current transformer connections.
Rev: 4-A-050213
Based on Manual Rev 4
Protection Relays & Controls
Motor Protection–Advanced
MPU-32 SERIES (PGR-6200)
Motor Protection Unit
Features & Benefits
FEATURES IEEE # BENEFITS
Overload
Dynamic thermal model
Communications
Ground fault
Current unbalance/
Phase loss/Phase reverse
RTD temperature
Phase loss/Phase reverse (current)
Overcurrent
Jam
Undercurrent
PTC overtemperature
Starts per hour
Differential
Reduced overcurrent mode
Metering
MPU-CIM
Analog output
Data logging
Conformal coating
49, 51
50G/N, 51G/N
46
38, 49
46
50, 51
37
49
66
87
Extends motor life and prevents insulation failures and fires
Provides protection through starting, running, and cooling cycles
Remotely view measured values and event records, reset trips, and access setpoints
Prevents catastrophic failures and fires
Prevents overheating due to unbalanced phases
RTD temperature protection (MPS-RTD module) for high-ambient or loss-of-ventilation protection
Detects unhealthy supply conditions
Prevents catastrophic failures and fires; extends motor life
Prevents motor damage by detecting mechanical jams or excessive loading
Detects low level or no-load conditions
Overtemperature (PTC) protection for high-ambient or loss-of-ventilation detection
Limits the motor starts per hour to prevent overheating
Optional MPS-DIF module for sensitive winding-fault protection
Minimizes arc-flash hazards during maintenance
View measured and calculated parameters with on-board display
Separate current input module to reduce risk of open-CT hazard and for convenient installation
Provides means for metering selectable parameters
On-board 100-event recorder for data logging
Internal circuits are conformally coated to protect against corrosion and moisture
Wiring Diagram
PHASE CURRENT
TRANSFORMERS
(required)
MPU-CIM
CURRENT INPUT MODULE
13 14 15 16 17
CIM
MOTOR PROTECTION UNIT
MPU-32
RELAY 2
12 11
GROUND-FAULT
CURRENT
TRANSFORMER
(recommended)
A B
2
TEMPERATURE INPUT
9 8 7
10
18
RELAY 1
19
21 22 23 24
26 25
DIG IN
RELAY 3
5 4 3 2 1
6
MPS-RTD
INPUT MODULE
(optional)
MPS-DIF
DIFFERENTIAL
MODULE
(optional)
+
4-20 mA
ANALOG
OUTPUT
C
D
27 31
......
I/0 MODULE
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 DF T, Peak, 16 samples/cycle, and
positive and negative sequence of fundamental
Frequency 50, 60 Hz or ASD
Output Contacts Three Form C programmables
Communications TIA-232 (standard); TIA- 485, DeviceNet™, Ethernet (optional)
Analog Output 4-20 mA, programmable
Conformally Coated Standard feature
Warranty 10 years
Mounting
(Control Unit) Panel (standard)
Surface (with MPU-32-SMK converter kit)
(Current Input Module) DIN, Surface
Approvals CSA certified, CE (European Union),
1
C-Tick ( Australian)
Overload (49, 51)
Phase reverse (current) (46)
Overcurrent (50, 51)
Jam
Ground fault (50G/N, 51G/N)
PTC overtemperature (49
RTD temperature (38, 49)
Unbalance (current) (46)
Starts per hour (66)
Differential (87)
Phase loss (current) (46)
Undercurrent (37)
© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/mpu-32
CONTROL
POWER
Rev: 4-A-050213
Based on Manual Rev 4
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