5-126 F650 DIGITAL BAY CONTROLLER GEK-106310-AF
5.5 CONTROL ELEMENTS CHAPTER 5: SETPOINTS
The time to Restart feature may be used to ensure that a certain amount of time passes between stopping a motor and
restarting that motor. This timer feature may be very useful for some process applications or motor considerations. If a
motor is on a down-hole pump, after the motor stops, the liquid may fall back down the pipe and spin the rotor backwards.
It would be very undesirable to start the motor at this time. In another scenario, a motor may be driving a very high inertia
load. Once the supply to the motor is disconnected, the rotor may continue to turn for a long period of time as it
decelerates. The motor has now become a generator and applying supply voltage out of phase may result in catastrophic
failure.
The Restart Block feature is strictly a timer. The F650 does not sense rotor rotation.
Maximum number of starts settings description:
Function: This setting allows enabling or disabling the Maximum numbers of starts function.
Full Load Amps.: This setting must be set with the current at full load of the motor in running conditions.
Breaker Supervision: This setting specifies if the element must consider the motor is stopped when the unit detects that
the breaker is open. If the Breaker supervision is DISABLED, the motor is considered to be stopped when the average
current of the three phases is below 5% of the value set for “Full Load Amps” during at least the period of time
programmed in “Min Stop time”. A motor start-up is detected when, being the motor stopped (according to the above
consideration), the average current of three phases rises above 7% of FLA. If the Breaker supervision is ENABLED, the
motor is considered to be stopped when the unit detects that the breaker is open. A motor start-up is detected when the
breaker is closed.
Min Stop Time: As has been related before, this setting must be configured with the time that this units has to detect the
average current below 5%of FLA, before considering that the motor is stopped.
Number of starts: Once the motor is stopped, the number of starts within the past hour is compared to the number of
starts allowable. If the two values are the same, an inhibit occurs. If an inhibit occurs, the lockout time is equal to one hour
less the first start time stored. A zero value in this setting disables this unit. The global counter of Number of starts
increases at each start of the motor detected but no action is taken.
Time to Restart: This setting may be used to ensure that a certain amount of time passes between stopping a motor and
restarting that motor.
Reset Counter: This settings is always DISABLED by default. When this setting is change or ENABLED the global counters of
starts is set to a zero value. It operates like a command to reset the starts counters, after being enabled it goes to its
default disabled status.
Snapshot events: The snapshot event setting enables or disables the snapshot event generation for this element.
This unit operates only if the motor is stopped, in order to avoid a new start. The unit nevers operate while the motor is
running.
The maximum number of starts actual values can be viewed at Actual > Status > Control Elements >Max. Number of
Starts:
SETPOINT > CONTROL ELEMENTS > MAX. NUMBERS OF STARTS
SETTING DESCRIPTION NAME DEFAULT VALUE STEP RANGE
Function Permission Function DISABLED N/A [DISABLED- ENABLED]
Motor Full Load Current Full Load Amps 5.0 0.1 A [0.5: 10.0]
Stop condition supervised
by breaker
Breaker
Supervision
DISABLED N/A [DISABLED- ENABLED]
Min. Stop Time 0.0 0.1s [0.0: 900.0]
Number of Starts per tour Number of Starts 5 1 [0: 100]
Reset counter setting Reset Counter DISABLED N/A [DISABLED- ENABLED]
Snapshot Event Generation Snapshot Events ENABLED N/A [DISABLED- ENABLED]
NOTE 1: A zero value in the number of starts disables the unit
NOTE 2: The reset counter setting can be enabled to set the motor starting count to zero
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