ABB MRP31.0 User Manual

C urren t
M easu re m ent
T he rm al
Motor Model
Outputs
Phase L oss,
Imbala nc e
O th e r Protection
Functio ns
Predefined or User-Defined Function Block Model
T rip
U nit
C om mands
(D I,
B U S,
P anel)
Sta rt/S top
Lo gic
S tarter
Fun ctio n
M onitorin g
(Pan el,
B us )
P rotectio n
M oto r Control
H ard w are
Supervision
C he ck ba ck
Supervision
Status Signals,
Measured Values
PTC
Control Function
Relevant Outputs
Application Trip
Signals
Relay Out
T1
T2
DI
DI0
DI1
DI2
DI3
DI4
DI5
DI0
Comm.
Interface
UMC-PAN
24VDC
0V
int. supply
DOC
DO0
DO1
DO2
DO3
1Ca
1Cb
IO Bus
Ext. Earth Fault
DI0-DI2
L
N
int. supply and I/O module supply
Out
24V
0V
24V supplied version
110-240V supplied version
11
SYSTEM OVERVIEW
—
Overview of the major building blocks of UMC100 and the data flow among them.
Building Blocks of UMC100.3
The next diagram shows the major function blocks of the UMC100.3 and the data flow among them.
The upper main block contains the protection-related functions. Signals from different signal sources are evaluated from the trip
unit. Depending on the configuration either a trip or a warning can be created. The motor protection always has priority regarding
control of the relay outputs. In case of a protection trip the relevant contacts are opened and thereafter the motor
is stopped. If the device fails, the watchdog opens the relay outputs automatically for safety reasons. There is no possibility
to bypass this watchdog.
The main inputs for motor protection are the current measurement and the thermistor sensor. The current measurement
provides information about the actual motor current in the three phases. An advanced motor model uses the current
information and calculates the corresponding motor temperature. At a certain level it will trigger an overload trip.
The thermistor input measures the PTC resistance. Based on the resistance the cold and hot state of the motor can be
distinguished. Also short-circuit or wire break conditions can be detected.
The lower main block contains the control-related functions. Incoming commands from the panel, the digital inputs or the
fieldbus are ranked from the control place selection block according to the user settings and then forwarded to the active starter
function.
The starter function block controls the relay outputs depending on its input signals and the actual state. Additionally monitoring
signals are prepared for the LCD display, the UMC100.3 signalling LEDs and the fieldbus monitoring and diagnosis telegrams.
All these blocks run in the so-called logic engine. It is possible to change the application which is running there but usually the pre-
defined applications will be sufficient. Further information about the creation of custom applications can be found in the Custom
Application Editor manual.

ABB MRP31.0 Specifications

General

Brand	ABB
Model	MRP31.0
Category	Controller
Language	English