46 ESP program features
Starting the motor
In some cases pump motor can be difficult to restart. This might be caused by solids
and/or sedimentation clogging the pump. Thus, it requires higher starting torque to
break through the blockage. Another difficulty occurs with a complex electric circuit
between drive and motor, typical for the step-up systems which makes accurate
torque production.
ACS880 ESP control program contains advanced current controller that allows user
to set directly a desired motor current reference instead of manipulating voltage
output. This enables user to achieve more accurate control over the motor starting
torque but avoid excessive voltage. The number of starting routines are available for
the user to take full advantage of the current controller benefits that improve motor
starting procedure.
Starting speed
Starting speed defines the frequency at which the drive begins modulating upon
receiving start-command. In the ESP systems, where AC transformer is used to step-
up voltage from low voltage drive to medium voltage motor. This function assists
efficient power transmission and prevent undesirable transformer saturation at start.
Acceleration assistance
Acceleration assistance function enables the user to set motor current reference used
during acceleration. This setting makes drive to extremely develop energy in the
motor that is necessary to accelerate high load at fast ramp rate. The function will
work until motor accelerate to a desired speed and then continue with energy
efficiency settings set by the user in group 80 Voltage control.
Settings
Parameter group 80 Voltage control (page 437).
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