Parker AC890 Product Manual page 62

Set-up Parameters
The drive has several control modes:
V/Hz
SV
CLV
890SD (Standalone) Drive: Frame G, H & J
VOLTS / HZ Set-up as an Open-Loop Drive (V/F Fluxing) - low performance applications
(fan, pump). Simplest method involving no speed feedback and no
compensation for load changes.
Autotune is not required.
SENSORLESS Set-up using the Sensorless Vector Fluxing Mode - medium performance
applications where the drive uses an electrical model of the motor to
VEC
automatically compensate for load changes.
The drive must be tuned to the motor in use by matching the motor parameters
in the drive to those of the motor being controlled.
You MUST use the Autotune feature after entering your parameter
values.
Set-up using the Closed-Loop Vector Mode - high performance applications
CLOSED-
where the drive uses external sensors (encoders) to automatically compensate
LOOP VEC
for load changes.
In this mode, speed feedback signals from the motor shaft encoder are
processed to determine the rotational speed of the shaft. A PI algorithm within
the software uses this information to produce varying gate drive signals to the
drive circuits. These signals cause the drive to output the required voltage and
frequency for a particular motor speed.
You MUST use the Autotune feature after entering your parameter
values.
Control Modes
890SD Standalone Drive
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