0-89 Date and Time Readout
Range: Function:
0 N/A* [0 - 0 N/A] Displays the current date and time. The date and time is updated continuously.
The clock will not begin counting until a setting different from default has been made in
par. 0-70
Date and Time
.
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-** or via the Function Setups accessed by pressing the [Quick Menus]
button.
NB!
This parameter cannot 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 torque
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 con-
trolling 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. CT
Auto Energy Optimization Compressor
[2]: For optimum energy efficient 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 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 performance, the motor power factor cos phi must be set correctly.
This value is set in par. 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 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
3 Parameter Description VLT
®
HVAC Drive Programming Guide
48
MG.11.C9.02 - VLT
®
is a registered Danfoss trademark
3
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