Multilin SR469 Instruction Manual Download

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4. SETPOINT PROGRAMMING

S2 SYSTEM SETUP

4-13

4.3.4

SERIAL COMMUNICATION CONTROL

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If enabled, motor starting and stopping is possible via any of the three SR469 communication ports. Refer to the Communications
chapter for command formats. When a stop command is issued, the R1 TRIP relay will be activated for 1 second to complete the trip coil
circuit for a breaker application or break the contact coil circuit for a contactor application. When a start command is issued, the auxiliary
relay assigned for starting control will be activated for 1 second to complete the close coil circuit for a breaker application or complete
the start control circuit for a contactor application. A contactor sealing contact would be used to maintain the circuit.

To issue a start or stop command via communications see Chapter 6 section 6.3.3, function code 05 “Execute Operation”.

4.3.5 REDUCED VOLTAGE

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FUNCTION:

The SR469 is capable of controlling the transition of a reduced voltage starter from reduced to full voltage. That transition may be based
on Current Only, Current and Time, or Current or Time (whichever comes first). When the SR469 measures the transition of no motor
current to some value of motor current, a 'Start' is assumed to be occurring (typically current will rise quickly to a value in excess of FLA
e.g. 3 x FLA). At this point, the Reduced Voltage Start Timer will be initialized with the programmed value in seconds.

•

If Current Only is selected, when the motor current falls below the user's programmed Transition Level, transition will be initiated by
activating the assigned output relay for 1 second. If the timer expires before that transition is initiated, an Incomplete Sequence Trip
will occur activating the assigned trip relay(s).

•

If Current or Timer is selected, when the motor current falls below the user's programmed Transition Level, transition will be initi-
ated by activating the assigned output relay for 1 second. If the timer expires before that transition is initiated, the transition will be
initiated regardless.

•

If Current and Timer is selected, when the motor current falls below the user's programmed Transition Level and the timer expires,
transition will be initiated by activating the assigned output relay for 1 second. If the timer expires before current falls below the
Transition Level, an Incomplete Sequence Trip will occur activating the assigned trip relay(s).