Danfoss PTU 025 Programming Guide

3.3 Parameters: 1-** Load and Motor
3.3.1 1-0* General Settings
Dene whether the frequency converter operates in open
loop or closed loop.
1-00 Conguration Mode
Option: Function:
NOTICE
This parameter cannot be adjusted while
the motor is running.
NOTICE
When set for closed loop, the commands
reversing and start reversing do not reverse
the motor direction.
[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 is determined by a reference from the
built-in PID controller varying the motor speed as
of a closed-loop control process (for example,
constant pressure or ow). Congure the PID
controller in parameter group 20-** Feedback or via
the Function Set-ups accessed by pressing [Quick
Menu].
1-03 Torque Characteristics
Option: Function:
[0] Compressor
torque
For speed control of screw and scroll
compressors. Provides a voltage which is
optimised for a constant torque load charac-
teristic of the motor in the entire range down
to 10 Hz.
[1] Variable
torque
For speed control of centrifugal pumps and
fans. Also to be used when controlling more
than 1 motor from the same frequency
converter (for example, multiple condenser
fans or cooling tower fans). Provides a
voltage which is optimised for a squared
torque load characteristic of the motor.
[2] Auto Energy
Optim. CT
For optimum energy-ecient speed control
of screw and scroll compressors. Provides a
voltage which is optimised for a constant
torque load characteristic of the motor in the
entire range down to 15 Hz. In addition, the
AEO feature adapts the voltage exactly to the
current load situation, thereby reducing
1-03 Torque Characteristics
Option: Function:
energy consumption and audible noise from
the motor. To obtain optimum performance,
set the motor power factor cos phi correctly.
This value is set in parameter 14-43 Motor
Cosphi. The parameter has a default value
which is automatically adjusted when the
motor data is programmed. These settings
ensure optimum motor voltage. If the motor
power factor cos phi requires tuning, an AMA
function can be carried out using
parameter 1-29 Automatic Motor Adaptation
(AMA). It is rarely necessary to adjust the
motor power factor parameter manually.
[3]
*
Auto Energy
Optim. VT
For optimum energy-ecient speed control
of centrifugal pumps and fans. Provides a
voltage optimised for a squared torque load
characteristic of the motor. In addition, the
AEO feature adapts the voltage exactly to the
current load situation, thereby reducing
energy consumption and audible noise from
the motor. To obtain optimum performance,
set the motor power factor cos phi correctly.
This value is set in parameter 14-43 Motor
Cosphi. The parameter has a default value
and is automatically adjusted when the
motor data is programmed. These settings
ensure optimum motor voltage. If the motor
power factor cos phi requires tuning, an AMA
function can be carried out using
parameter 1-29 Automatic Motor Adaptation
(AMA). It is rarely necessary to adjust the
motor power factor parameter manually.
1-06 Clockwise Direction
Option: Function:
NOTICE
This parameter cannot be adjusted while
the motor is running.
This parameter denes the term clockwise
corresponding to the LCP direction arrow. Used for
easy change of direction of shaft rotation without
swapping motor wires.
[0] * Normal The motor shaft turns in clockwise direction when
the frequency converter is connected U⇒U, V⇒V,
and W⇒W to the motor.
[1] Inverse Motor shaft turns in counterclockwise direction
when the frequency converter is connected U⇒U,
V⇒V, and W⇒W to the motor.
Parameter Descriptions Programming Guide
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Danfoss PTU 025 Specifications

General

Brand	Danfoss
Model	PTU 025
Category	DC Drives
Language	English