Main Menu - Load And Motor - Group - Danfoss VLT FC 100 Series Programming Manual

Parameter Description

3.3 Main Menu - Load and Motor - Group 1

3.3.1 1-0* General Settings
3 3
Define whether the Adjustable frequency drive operates in
open-loop or closed-loop.
1-00 Configuration Mode
Option:
[0] Open-
*
loop
[3] Closed-
loop
NOTE!
This parameter cannot be changed while the motor is
running.
NOTE!
When set for Closed-Loop, the commands Reversing and
Start Reversing will not reverse the direction of the motor.
1-03 Torque Characteristics
Option:
[0] Compressor
torque
*
[1] Variable
torque
[2] Auto Energy
Optim. CT
3-14
VLT
Function:
Motor speed is determined by applying a speed
reference or by setting desired speed when in
Hand Mode.
Open-loop is also used if the Adjustable
frequency drive is part of a closed-loop control
system based on an external PID controller
providing a speed reference signal as output.
Motor speed will be determined by a reference
from the built-in PID controller varying the
motor speed as part of a closed-loop control
process (e.g., constant pressure or flow). The PID
controller must be configured in parameter
group 20-** or via the Function Setups accessed
by pressing the [Quick Menus] button.
Function:
Compressor [0]: For speed control of screw
and scroll compressors. Provides a voltage
which is optimized for a constant torque load
characteristic of the motor in the entire range
down to 10 Hz.
Variable Torque [1]: For speed control of
centrifugal pumps and fans. Also to be used
when controlling more than one motor from
the same Adjustable frequency drive (e.g.,
multiple condenser fans or cooling tower
fans). Provides a voltage which is optimized
for a squared torque load characteristic of the
motor.
Auto Energy Optimization Compressor [2]: For
optimum energy efficient speed control of
screw and scroll compressors. Provides a
voltage that is optimized for a constant
torque load characteristic of the motor in the
MG11CD22 - VLT
®
HVAC Drive Programming Guide
1-03 Torque Characteristics
Option:
[3] Auto Energy
Optim. VT
*
NOTE!
1-03 Torque Characteristics will not have effect when
1-10 Motor Construction = [1] PM, non-salient SPM.
NOTE!
For pumps or fan applications where the viscosity or
density can vary significantly or where excessive flow, e.g.,
due to pipe breakage can occur, it is recommended to
select Auto Energy Optim. CT.
® is a registered Danfoss trademark
Function:
entire range down to 15 Hz. In addition, the
AEO feature will adapt the voltage exactly to
the current load situation, thereby reducing
energy consumption and audible noise from
the motor. To obtain optimal performance,
the motor power factor cos phi must be set
correctly. This value is set in 14-43 Motor Cos-
Phi. The parameter has a default value which
is automatically adjusted when the motor
data is programmed. These settings will
typically ensure optimum motor voltage but
if the motor power factor cos phi requires
tuning, an AMA function can be carried out
using 1-29 Automatic Motor Adaptation (AMA).
It is very rarely necessary to adjust the motor
power factor parameter manually.
Auto Energy Optimization VT [3]: For optimum
energy efficient speed control of centrifugal
pumps and fans. Provides a voltage which is
optimized for a squared torque load charac-
teristic of the motor but in addition the AEO
feature will adapt the voltage exactly to the
current load situation, thereby reducing
energy consumption and audible noise from
the motor. To obtain optimal performance,
the motor power factor cos phi must be set
correctly. This value is set in 14-43 Motor Cos-
Phi. The parameter has a default value and is
automatically adjusted when the motor data
is programmed. These settings will typically
ensure optimum motor voltage but if the
motor power factor cos phi requires tuning,
an AMA function can be carried out using
1-29 Automatic Motor Adaptation (AMA). It is
very rarely necessary to adjust the motor
power factor parameter manually.