3.3. Main Menu - Load and Motor - Group 1
3.3.1. General Settings, 1-0*
Define whether the frequency converter operates in open loop or closed loop.
1-00 Configuration Mode
Option:
Function:
[0]
*
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 part of a closed loop control system based on an external
PID controller providing a speed reference signal as output.
[3]
Closed loop
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 par.
20-** Drive Closed Loop or via the Function Setups accessed by pressing the [Quick Menus] button.
This parameter can not be changed when motor is running.
NB!
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
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.
[1]
Variable torque
Variable Torque
[1]: 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]
Auto energy optim.
compressor
Auto Energy Optimization Compressor
[2]: For optimum energy efficient speed control of screw and scroll com-
pressors. Provides a voltage which is optimized for a constant torque load characteristic of the motor in the
entire range down to 15Hz 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 perform-
ance, the motor power factor cos phi must be set correctly. This value is set in par. 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 par. 1-29
Automatic Motor Adaptation (AMA)
. It is very rarely necessary
to adjust the motor power factor parameter manually.
[3]
*
Auto energy optim. VT
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 characteristic 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 par. 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 par. 1-29
Automatic
Motor Adaptation (AMA)
. It is very rarely necessary to adjust the motor power factor parameter manually.
3.3.2. 1-2* Motor Data
Parameter group 1-2* comprises input data from the nameplate on the connected motor.
Parameters in parameter group 1-2* cannot be adjusted while the motor is running.
VLT
®
HVAC Drive Programming Guide
3. Parameter Description
MG.11.C5.02 - VLT
®
is a registered Danfoss trademark
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