GE AF-650 GP Programming Manual page 74

Parameter Descriptions
H-58 Flying Start Test Pulses Current
Range: Function:
30 % [0 - Sets the current level for the fly start test
*
200 %] pulses that are used to detect the motor
direction. 100% means I
be big enough to avoid noise influence, but
low enough to avoid affecting the accuracy
(current must be able to drop to 0 before the
next pulse). Reduce the value to reduce the
generated torque.
Default is 30% for asynchronous motors, but
may vary for PM motors. For adjusting PM
motors, the value tunes for back EMF and d-
axis inductance of the motor.
H-59 Flying Start Test Pulses Frequency
Range: Function:
200 % [0 - Asynchronous motor: Set the frequency of the
500 %] flying start test pulses that are used to detect
*
the motor direction. For asynchronous motors,
the value 100% means that the slip is doubled.
Increase this value to reduce the generated
torque.
For synchronous motors, this value is the
percentage nm,n of the free-running motor.
Above this value, flying start is always
performed. Below this value, the start mode is
selected in parameter F-20 PM Start Mode
3.7.6 H-6# Load Depen. Settings
Parameters to configure the load-dependent motor
settings.
H-61 High Speed Load Compensation
Range: Function:
100 % [0 - Enter the % value to compensate voltage in
*
300 %] relation to load when the motor is running
at high speed and obtain the optimum U/f
characteristic. The motor size determines the
frequency range within which this parameter
is active.
Motor size
0.25 - 7.5 kW
Table 3.14 Changeover Frequency
DET-618D
AF-650 GP™ Programming Guide
. Adjust the value to
m,n
Changeover
>10 Hz
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H-62 Brake Check Limit Factor Source
Select the input source for the function in parameter B-15 Brake
Check. If several frequency converters are carrying out a brake
check simultaneously, the resistance in the grid leads to a
voltage drop on the mains or DC-link and a false brake check
can occur. Use an external current sensor on every brake resistor.
If an application requires a 100% valid brake check, connect the
sensor to an analog input.
Option:
[0] DC-link voltage
*
[1] Analog Input 53
[2] Analog Input 54
H-63 Brake Check Limit Factor
Range: Function:
98 [0 - Enter the limit factor that parameter B-15 Brake
% 100 % Check uses when performing the brake check. The
*
] frequency converter uses the limit factor
depending on the selection in
parameter H-62 Brake Check Limit Factor Source:
[0] DC-link voltage - the frequency converter
applies the factor to the EEPROM data in the DC-
link.
[1] Analog Input 53 or [2] Analog Input 54 - the
brake check fails if the input current on the analog
input is lower than the maximum input current
multiplied by the limit factor.
For example, in the following configuration the
brake check fails if the input current is lower than
16 mA:
•
A current transducer with a range of 4-20
mA is connected to analog input 53.
•
Parameter H-63 Brake Check Limit Factor is
set to 80%.
Function:
The frequency converter
performs the brake check by
monitoring the DC-link
voltage. The frequency
converter injects current in
the brake resistor which
lowers the DC-link voltage.
Select to use an external
current sensor for brake
monitoring.
Select to use an external
current sensor for brake
monitoring.
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