Operating instructions

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]
*
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.
NOTE
This parameter cannot be changed when 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]
*
Compres-
sor torque
Compressor [0]: For speed control of screw and
scroll compressors. Provides a voltage which is
optimized for a constant torque load characteris-
tic of the motor in the entire range down to 10
Hz.
[1] Variable
torque
Variable Torque [1]: For speed control of centrifu-
gal 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 character-
istic 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 character-
istic of the motor in the entire range down to
1-03 Torque Characteristics
Option: Function:
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 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 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.
1-06 Clockwise Direction
This parameter defines the term “Clockwise” corresponding to the
LCP direction arrow. Used for easy change of direction of shaft
rotation without swapping motor wires. (Valid from SW version
5.84)
Option: Function:
[0]
*
Normal Motor shaft will turn in clockwise
direction when frequency convert-
er is connected U -> U; V -> V, and
W -> W to motor.
[1] Inverse Motor shaft will turn in counter
clockwise direction when frequen-
cy converter is connected U -> U; V
-> V, and W -> W to motor.
This parameter cannot be changed while the motor is running.
Parameter Description
VLT
®
HVAC Drive Programming Guide
38 MG.11.CA.02 - VLT
®
is a registered Danfoss trademark
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