STEP ET Series - Page 105

Chapter 7 Parameter Explanation
ET/EP/EH Series Intelligent Flexible Driver Manual
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P17.00
DC injection current (%)
0.1~200.00
30.00
Starting injection DC size. Use injecting DC current during start-up as start torque. If current has
oscillation during start-up, you can increase the size of current injection appropriately.
P17.01
DC injection slope (s)
0.00~655.35
1.00
Slope of DC injection current rise and the increasing speed of start injection current represent the
current increase from 0 to the set corresponding time. Unit is s and default is 1.0s. This parameter
should be smaller than excitation time (P11.05) to ensure DC injection current or excitation current
reach the set value.
P17.02
External synchronization
switching frequency (%)
0~100
5
Setting to 0 indicates that there is no external synchronization function. If set to a non-zero value, the
external synchronization function will be enabled. The setting value is the external synchronization
switching frequency point. When preset frequency is less than or equal to switching point
corresponding frequency, the output control is constant current. GVC control is selected if the value
is greater than this frequency.
For example, for the motor with 50Hz rated frequency, if this parameter is 10%, then it uses constant
current output control when running frequency is below and including 5Hz. If greater than 5Hz,
GVC control is used.
External synchronous output current can be set by parameter P17.00. During heavy load start-up, DC
injection current value should be increased. Generally during motor start-up vibration or when
reporting 21#fault, you can try external synchronization start-up.
Function code
Name
Setting range
Factory setting
P17.03
Low-velocity voltage
compensation gain (%)
0.00~200.00
0.00
During low velocity operation, increase output voltage capabilities and also increase the motor
capabilities of low velocity operation with load. The default value of P17.03 is 0%, which means no
low velocity voltage compensation by default.
Function code
Name
Setting range
Factory setting
P17.04
Voltage compensation upper
limit frequency (%)
0.00~300.00
0.40
Voltage compensation upper limit frequency P17.04 is the calibration value, and the default value is
40%, which means if rated frequency is 50Hz, then default voltage compensation upper limit
frequency is 50Hz

40% = 20Hz.
No output voltage compensation when greater than P17.04 voltage compensation upper limit
frequency; Output voltage will compensate when lower than P17.04 voltage compensation upper
limit frequency.
P17.05
Vibration rejection gain
0.00~655.35
2.00
Generally, the value is 1/25 of rated frequency. For example, the motor rated frequency is 50.00Hz,
then this value should be 2.00. This value is used to adjust the current fluctuation rejection function
of the GVC control algorithm. The greater the vibration rejection gain, the more obvious the
vibration rejection effect; but dynamic performance will deteriorate.
P17.15
Compensation function
selection
0~65535
256