Mitsubishi Electric MEsoftstart/I01 Users, Installation & Instruction Manual page 52

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Switch
Usage
Bypass
The soft starter can be used with a built-in or external bypass contactor. A bypass contactor is activated once
the motor is running and reduces the current through the soft starter switching elements while the motor is
running. If present, the bypass contactor is controlled from the soft starter and is activated as soon as the motor
is running and de-activated before the stop ramp commences.
If the soft starter is configured for use without a bypass contactor, the running current of the motor passes
through the soft starter for the entire time that the motor is running.
A bypass contactor is recommended for installations where the motor is started a few times a day and run for
long periods between starts.
A bypass contactor does not add much value when the motor is started and then run for short intervals.
For models with built-in contactors this switch should always be in the 'Bypass' position.
Duty
When the soft starter is installed in a site where the motor requires a long start ramp or more than 10 starts
per hour, this switch should be set to Heavy Duty and the selection criteria in
Duty should be used to scale the motor size and the soft starter. Heavy duty usage generates more heat
internally to the soft starter and the lifespan of the soft starter will be affected if the soft starter is used in an
application that is not suitable for the duty of the motor.
The switch may be set to Normal Duty when the start ramp time is 30 seconds or less and the starts per hour is
10 or less.
Note that when the switch is changed to 'Normal' the 'Maximum Number of starts per hour' reverts to 10. This
may be changed using the Modbus interface (or PC Application) to any number of starts per hour up to 10.
When the switch is changed to 'Heavy' the 'Maximum Number of starts per hour' reverts to 60. This may be
changed using the Modbus interface (or PC Application) to any number of starts per hour up to 60.
JOG
The soft starter provides the capability to JOG the motor. This functionality may be used to e.g. align a conveyor
belt with a loading bay. The JOG functionality will allow the user to slowly turn the motor while the START button
is being pressed. The motor will coast to a stop when the START button is released.
JOG will run the motor at the percentage as set by the Start Ramp Starting % potentiometer.
The Motor Full Load Current % should be set correctly for the motor that is being used.
The intention of JOG is to use the functionality for short, infrequent periods. Over-use of the JOG function will
overheat the motor and the soft starter and will activate a temperature trip.
The normal setting for this switch is 'NORMAL'. In NORMAL the START button will initiate a start ramp to start
and run the motor.
Motor connection
The soft starter allows for motor to be wired in normal 3-wire connection or in 6-wire inside-delta connection.
The inside-delta wiring allows for a lower current that flows through the soft starter and larger motors may be
used with the same size soft starter. Refer to Figure 5 for Inside-Delta connection.
Refer paragraph 2.1.1 and paragraph 2.1.2 to understand the difference between the wiring, to be able to make
the correct selection.
The potentiometers can be used to configure the soft starter as listed below:
Potentiometer
Usage
Start Ramp Duration
The duration of the start ramp can be adjusted from 5 seconds to 30 seconds.
Stop Ramp Duration
The stop ramp may be disabled by setting this dial to zero and the motor will coast to a stop. When a controlled
soft-stop is required, the stop ramp duration may be set up to 30 seconds.
Start Ramp starting %
The Start Ramp may be started between 15% and 60% depending on the load of the motor. Starting the ramp
at too low a percentage will cause heating build-up in the motor without actually turning the motor.
52 Basic operation – Core models
Table 1
to Table 2 for Heavy

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