BENSHAW RediStart MX3 Series, User Manual

Page: 84 / 238

Maximum Current 1 QST 07
LCD Display
Range 100 – 800 % of FLA (Default 600%)
Description The Maximum Current 1 parameter is set as a percentage of the Motor FLA (QST01) parameter setting. This
parameter performs two functions. It sets the current level for the end of the ramp profile, as well as the
maximum current that is allowed to reach the motor after the ramp is completed.
If the ramp time expires before the motor has reached full speed, the starter holds the current at the maximum
current level until either the UTS timer expires; the motor reaches full speed, or the overload trips.
Typically, the maximum current is set to 600% unless the power system or load dictates the setting of a lower
maximum current.
See Also Up To Speed Time (QST09) on page 77.
Start Mode (CFN01) on page 78.
Ramp Time 1 (QST08 / CFN02) on page 78.
Initial Current 1 (QST06 / CFN03) 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.
Ramp Time 1 QST 08
LCD Display
Range 0 – 300 seconds (Default 15)
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.
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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.
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6 - PARAMETER DESCRIPTION
QST: Max Cur 1
07
600 %
QST: Ramp Time 1
08
15 sec