GE AF-650 GP Programming Manual page 65

Parameter Descriptions
H-43 Torque Characteristics
Option:
3 3
[0] Constant
torque
*
[1] Variable
torque
[2] Energy
Savings
CT
[5] Constant
Power
H-44 Constant or Variable Torque OL
Option:
[0] High torque
*
[1] Normal torque For oversized motor - allows up to 110%
64
AF-650 GP Programming Guide
Function:
NOTE
This parameter cannot be adjusted while
the motor is running.
Select the torque characteristic required.
VT and Automatic Energy Savings are both
energy saving operations.
Motor shaft output provides constant torque
under variable speed control.
Motor shaft output provides variable torque
under variable speed control. Set the variable
torque level in SP-40 VT Level.
Automatically optimises energy consumption by
minimising magnetisation and frequency via
SP-41 Energy Savings Min. Magnetization and
SP-42 Energy Savings Min. Frequency.
The function provides a constant power in the
field weakening area.
The torque shape of motor mode is used as a
limit in the generatoric mode. This is done to
limit the power in generatoric mode that
otherwise becomes considerable larger than in
motor mode, due to the high DC link voltage
available in generatoric mode.
P W = ω mech rad / s × T Nm
shaft
This relationship with the constant power is
illustrated in Illustration 3.24:
Illustration 3.24 Constant Power
Function:
NOTE
This parameter cannot be adjusted
while the motor is running.
Allows up to 160% over torque.
over torque.
H-45 Local Mode Configuration
Option: Function:
Select which application configuration
mode (H-40 Configuration Mode), i.e.
application control principle, to use when a
Local (keypad) Reference is active. A Local
Reference can be active only when
F-02 Operation Method is set to [0] Linked to
Hand/Auto or [2] Local. By default the local
reference is active in Hand Mode only.
[0] Speed open
loop
[1] Speed Closed
Loop
[2] As mode par
*
H-40
H-46 Back EMF at 1000 RPM
Range: Function:
500 [0 - Set the nominal back EMF for the motor when
V 9000 V] running at 1000 RPM.
*
Back EMF is the voltage generated by a PM
motor when no frequency converter is
connected and the shaft is turned externally.
Back EMF is normally specified for nominal
motor speed or for 1000 RPM measured
between two lines. If the value is not available
for a motor speed of 1000 RPM, calculate the
correct value as follows. If back EMF is eg. 320 V
at 1800 RPM, it can be calculated at 1000 RPM
as follows:
Calculate RPM at 1000 RPM as follows: Back
EMF= (Voltage/RPM)*1000 = (320/1800)*1000 =
178.
This is the value that must be programmed for
H-46 Back EMF at 1000 RPM
This parameter is only active when P-20 Motor
Construction is set to [1] PM motor (Permanent
Magnet Motor).
NOTE
When using PM motors, it is recommended
to use brake resistors.
H-47 Motor Angle Offset
Range: Function:
0 [-32768 - Enter the correct offset angle between the PM
*
32767] motor and the index position (single-turn) of the
attached encoder or resolver. The value range of
0 - 32768 corresponds to 0 - 2 * pi (radians). To
obtain the offset angle value: After frequency
converter start-up apply DC-hold and enter the
value of DR-20 Motor Angle into this parameter.
DET-618C