Page 4–46
DURApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
Chapter 4: AC Drive Parameters
Type Hex Addr Dec Addr
P1.21 Skip Frequency 2 Upper Limit
R/W 0115 40278
Type Hex Addr Dec Addr
P1.22 Skip Frequency 2 Lower Limit
R/W 0116 40279
Type Hex Addr Dec Addr
P1.23 Skip Frequency 3 Upper Limit
R/W 0117 40280
Type Hex Addr Dec Addr
P1.24 Skip Frequency 3 Lower Limit
R/W 0118 40281
P1.21
thru
P1.24
Range/Units (Format: 16-bit unsigned) Default
0�00~600�00 Hz
0
These parameters allow additional Skip Frequency Upper Limit and Lower Limit settings.
The Skip Frequency Upper Limit parameters operate the same way as does Skip Frequency Upper
Limit 1, P1.19 (page 4–45).
The Skip Frequency Lower Limit parameters operate the same way as does Skip Frequency Lower
Limit 1, P1.20 (page 4–45).
Type Hex Addr Dec Addr
P1.25 DC Injection Current Level
♦R/W 0119 40282
Range/Units (Format: 16-bit unsigned) Default
0~100%
0�00
This parameter sets the level of DC Brake Current output to the motor during start-up and
stopping. When setting DC Injection Current Level percentage, the drive Rated Current is regarded
as 100%. It is recommended to start with a low DC Brake Current Level and then increase until
proper holding torque has been attained.
Type Hex Addr Dec Addr
P1.26 DC Injection Time During Start-up
♦R/W 011A 40283
Range/Units (Format: 16-bit unsigned) Default
0�0~60�0 sec
0
DC Brake at Start-up is used for loads that may move before the GS4 drive starts, such as fans
and pumps. Under such circumstances, DC Brake can be used to hold the load in position before
setting it in motion.
When the drive doesn’t have any output, the motor may be in the rotation status due to external
force or its inertia. If the drive is used with the motor at this moment, it may cause motor damage
or drive protection due to over current. This parameter can be used to output DC current before
motor operation to stop the motor and get a stable start. This parameter determines the duration
of the DC Brake current after a RUN command. When P1.26 is set to 0.0, DC Injection is not used
during start-up.
Example: P1.26 is set to 3 (and there is a non-zero value in P1.25). When the drive is given a RUN
command, the DC output (P1.25) will be applied for 3 seconds, then the normal acceleration ramp
will begin.
Related parameters: P1.25 DC Injection Current Level; P3.51 Brake Delay Time, Multi-Function
Output = #12 or #42.
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