Breaker Auxiliary Contact Control Equation Setting; Start And Emergency Restart Logic - Siemens SIMPRO-100 Instruction Manual

SIMPRO-100
The relay automatically locks out the motor by
asserting the trip signal under any of the following
conditions:
• Antibackspin Lockout
The antibackspin timer has not expired since
the motor trip occurred. The trip signal is
maintained until the antibackspin timer
expires.
• Minimum Time Between Starts Lockout
A new start is not permitted until after the
minimum time between starts has passed.
The trip signal is maintained until a start is
permitted.
• Starts-Per-Hour Limit Lockout.
If the starts-per-hour limit has been met, a
new start is not permitted until 60 minutes
after the oldest start. The trip signal is
maintained until a start is permitted.
• Thermal Element Lockout.
The motor thermal element % Thermal
Capacity value is too high to permit a normal
motor start without tripping. The trip signal is
maintained until the % Thermal Capacity
decreases to a level where a start can safely
take place.
If any of the above protection functions is not
enabled by the relay settings, that function does
not affect trip unlatch.
Also note that the relay automatically asserts the
trip signal if the motor stops and a lockout
condition is true. The trip signal is maintained
until all the enabled motor lockout conditions are
satisfied.
Trips initiated by the STOP command, the
front-panel Stop Motor function, or by Modbus
operation are maintained for at least the duration
of the Minimum Trip Duration Time (TDURD)
setting.
PRIM-2400C
Control Equations & Relay Logic
B.10 Breaker Auxiliary
Contact Control
Equation Setting
The breaker auxiliary contact control equation
setting, 52A =, defines the relay input contact that
is connected to a breaker auxiliary contact. The
factory default setting, 52A = !IN1, allows you to
connect a breaker 52B contact to input IN1. If you
wish to connect a breaker 52A contact to the
input, set 52A = IN1. The equation result is the
52A Relay Word bit. You can use the result to
create custom control functions such as breaker
failure logic, if necessary, for your application.
B.11 Start and Emergency
Restart Logic
Figure B.8 shows the logic the relay uses to
initiate motor starts.
Figure B.8 Start Logic
If the Trip output contact is not asserted, the relay
asserts the START Relay Word bit in response to
any of these conditions:
• The Motor Start control equation (STR) result
is true (logical 1)
• The Emergency Restart Relay Word bit
asserts
• You execute the STR serial port command or
a Modbus Start control command
B
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