BENSHAW RediStart MX3 Series, User Manual

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Description The Ramp Time 1 parameter is the time it takes for the starter to allow the current, voltage, torque or power
(depending on the start mode) to go from its initial to the maximum value. To make the motor accelerate
faster, decrease the ramp time. To make the motor accelerate slower, increase the ramp time.
A typical ramp time setting is from 15 to 30 seconds.
If the ramp time expires before the motor reaches full speed, the starter maintains the maximum current level
until either the motor reaches full speed, the UTS timer expires, or the motor thermal overload trips.
z
NOTE
: Setting the ramp time to a specific value does not necessarily mean that the motor will take this
time to accelerate to full speed. The motor and load may achieve full speed before the ramp time expires if
the application does not require the set ramp time and maximum current to reach full speed. Alternatively, the
motor and load may take longer than the set ramp time to achieve full speed.
See Also Up To Speed Time (QST09) on page 77.
Start Mode (CFN01) on page 78.
Initial Current 1 (QST06 / CFN03) on page 79.
Maximum Current 1 (QST07 / CFN04) on page 79.
Kick Level 1 (CFN11) on page 84.
Kick Time 1 (CFN12) on page 84.
Theory of Operation section 7.3.1, Current Ramp Settings, Ramps and Times on page 148.
Initial Current 1 CFN 03
LCD Display
Range
50 – 600 % of FLA
(Default 100%)
Description
The Initial Current 1 parameter is set as a percentage of the Motor FLA (QST01) parameter setting. The
Initial Current 1 parameter sets the current that is initially supplied to the motor when a start is commanded.
The initial current should be set to the level that allows the motor to begin rotating within a couple of seconds
of receiving a start command.
To adjust the initial current setting, give the starter a run command. Observe the motor to see how long it
takes before it begins rotating and then stop the unit. For every second that the motor doesn’t rotate, increase
the initial current by 20%. Typical loads require an initial current in the range of 50% to 175%.
If the motor does not rotate within a few seconds after a start command, the initial current should be increased.
If the motor takes off too quickly after a start command, the initial current should be decreased.
The Initial Current 1 parameter must be set to a value that is lower than the Maximum Current 1 parameter
setting.
See Also Start Mode (CFN01) on page 78.
Ramp Time 1 (QST08 / CFN02) on page 78.
Maximum Current 1 (QST07 / CFN04) on page 79.
Kick Level 1 (CFN11) on page 84.
Kick Time 1 (CFN12) on page 84.
Theory of Operation section 7.3.1, Current Ramp Settings, Ramps and Times on page 148.
Maximum Current 1 CFN 04
LCD Display
Range 100 – 800 % of FLA (Default 600%)
79
6 - PARAMETER DESCRIPTION
CFN: Init Cur 1
03
100 %
CFN: Max Cur 1
04
600 %