ABB ACS850 - IR Compensation for a Scalar Controlled Drive; Signal Supervision; Speed Controller Tuning

44 Program features
• If the nominal current of the motor is less than 1/6 of the nominal output current of
the drive
• If the drive is used without a motor connected (for example, for test purposes)
• If the drive runs a medium-voltage motor through a step-up transformer.
In scalar control, some standard features are not available.
 IR compensation for a scalar controlled drive
IR compensation is active only when
the motor control mode is scalar. When
IR compensation is activated, the drive
gives an extra voltage boost to the
motor at low speeds. IR compensation
is useful in applications that require a
high break-away torque.
In Direct Torque Control (DTC), no IR
compensation is possible or needed.
Signal supervision
Three signals can be selected to be supervised by this function. Whenever the signal
exceeds (or falls below) a predefined limit, a bit of 06.13 Superv status is activated.
Absolute values can be used.
Settings
Parameter group 33 Supervision (page 151).
Speed controller tuning
The speed controller of the drive can be automatically adjusted using the autotune
function (parameter 23.20 PI tune mode). Autotuning is based on the load and inertia
of the motor and the machine. It is, however, also possible to manually adjust the
controller gain, integration time and derivation time.
f (Hz)
Motor Voltage
No compensation
IR Compensation