Danfoss VLT FC 103 Programming Manual Download Page 37

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3.3 Main Menu - Load and Motor - Group 1

3.3.1 1-0* General Settings

Define whether the frequency converter operates in open
loop or closed loop.

1-00 Configuration Mode

Option:

Function:

[0]

Speed
Open
Loop

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 frequency
converter is of a closed loop control system
based on an external PID controller providing a
speed reference signal as output.

[3]

Process
Closed
Loop

Motor Speed will be determined by a reference
from the built-in PID controller varying the
motor speed as 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 [Quick Menus].

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:

Function:

[0]

Compressor
CT

For speed control of screw and scroll
compressors. Provides a voltage which is
optimized for a constant torque load charac-
teristic of the motor in the entire range down
to 15 Hz.

[1] Condenser

For speed control of centrifugal pumps and
fans. Also to be used when controlling more
than one motor from the same frequency
converter (e.g. multiple condenser fans or
cooling tower fans). Provides a voltage which
is optimized for a squared torque load
characteristic of the motor.

[2] Compressor

AEO CT

Auto Energy Optimization Compressor

. For

optimum energy efficient speed control of
screw, scroll and piston compressors. Provides
a voltage which is optimized for a constant
torque load characteristic of the motor in the
entire range down to 15 Hz 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

1-03 Torque Characteristics

Option:

Function:

performance, the motor power factor cos phi
must be set correctly. This value is set in

14-43 Motor Cosphi

. 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.

[3] Single fan/

pump AEO

Auto Energy Optimization VT

. 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

Cosphi

. 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.

3.3.2 1-1* Motor Selection

1-10 Motor Construction

Select the motor construction type.

Option:

Function:

[0]

Asynchron

For asynchronous motors.

NOTE

Motor construction can either be asynchronous or
permanent magnet (PM) motor.