240
1MRS751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
11.7.5.
Connections
All the necessary settings for the connections and signal routings can be set by using
Relay Setting Tool or a local HMI.
11.7.5.1.
Protection signal routing
The settings for the protection signal routing can be implemented as described in
Section 9.2.3.3. Protection signal routing.
11.7.5.2.
Indication and control connections
The connections for indication and control can be implemented as described in
Section 9.2.3.4. Indication and control connections with the exception of the signals
for the open and close buttons that are disconnected in this example. Local control
can be executed via HMI according to the instructions in
REX 521 Operator's
Manual
(see Section 1.5. Related documents).
If the TOL3Dev or MotStart block are not in use, they should be disconnected from
the Restart Enable signal by the SWGRP (10V325).
11.7.5.3.
Indication of motor status
The motor statuses “Stop” and “Runs” can be indicated both remotely and locally
by the function block I<->O IND3. Indication can be based on the measured current
level, and/or on the state of the speed switch binary input, or on the measured current
level and circuit breaker state. The open indication of I<->O IND3 function block
corresponds to “Stop” status and close indication corresponds to “Runs” status of the
motor.
The basis for the motor status indication can be selected in
Main menu\Configuration\Input SWGRP\Motor status
. The
different options are the following:
Table 11.7.-1 Motor status indication options
Option
Description
Checksum
STOP:CB & I
Motor stop indication by current limit (low
alarm) and circuit breaker open status input
1
STOP:I
Motor stop indication by current limit (low
alarm)
2
STOP:I & Ind.
Motor stop indication by current limit (low
alarm) and motor status input
4
STOP:Ind.
Motor stop indication by speed switch input
8
RUNS:Ind.
Motor runs indication by speed switch input
16
RUNS:I & Ind.
Motor runs indication by current limit (high
alarm) and speed switch input
32
RUNS:I
Motor runs indication by current limit Motor
runs indication by current limit (high alarm)
64
RUNS:CB & I
Motor runs indication by current limit (high
alarm) and circuit breaker close status input
128
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