890CS & 890CD Common Bus Units
Page
4-38
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D
8
9
10
11
A
B
C
D
1
2
3
4
5
6
7
E
Set-up Parameters
The drive has several control modes:
Control Modes
V/Hz
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
.
SV
SENSORLESS
VEC
Set-up using the Sensorless Vector Fluxing Mode
- medium performance
applications where the drive uses an electrical model of the motor to
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.
CLV
CLOSED-
LOOP VEC
Set-up using the Closed-Loop Vector Mode
- high performance applications
where the drive uses external sensors (encoders) to automatically compensate
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.
