Parameter and variable descriptions – Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE User Manual
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PARAMETER AND VARIABLE DESCRIPTIONS
1557-UM050F-EN-P – June 2013
Speed Command 9 Minimum [Speed cmd 9 min]
Linear number:
45
Minimum value:
127.0 Hz
Default value:
6.0 Hz
This parameter specifies the value of speed command corresponding to a digital speed command input of 0.
The required value can be calculated using the following formula:
Speed cmd 9 min = fmin + [vmin x (fmax-fmin) / (vmax-vmin)]
fmin is the minimum operating speed
fmax is the maximum operating speed
vmin is the value corresponding to minimum operating speed
vmax is the value corresponding to maximum operating speed
Speed Command 9 Maximum [Speed cmd 9 max]
Linear number:
46
Minimum value:
0.0 Hz
Maximum value:
127.0 Hz
Default value:
60.0 Hz
This parameter specifies the value of speed command corresponding to a digital speed command input of
32767. It may be less than Speed Command 9 Minimum. The required value can be calculated using the
following formula:
Speed cmd 9 max = fmin + [(32767-vmin) x (fmax-fmin) / (vmax-vmin)]
The terms are as defined in the description of parameter Speed Command 9 Minimum.
Speed Command Minimum [Speed cmd min]
Linear number:
47
Minimum value:
1.0 Hz
Maximum value:
75.0 Hz
Default value:
6.0 Hz
This parameter specifies the minimum value of the speed command. When the drive is running, the absolute
value of the speed command will not be less than this value regardless of the other parameter settings (except
for Speed Command Maximum).
Speed Command Maximum [Speed cmd max]
Linear number:
48
Minimum value:
1.0 Hz
Maximum value:
75.0 Hz
Default value:
60.0 Hz
This parameter specifies the maximum value of the speed command. The absolute value of the speed
command will not be greater than this value regardless of the other parameter settings (including Speed
Command Minimum).
4 Skip Speed Parameters
Skip Speed 1-4 [Skip speed 1-4]
Linear numbers:
49-52
Minimum value:
6.0 Hz
Maximum value:
90.0 Hz
Default value:
90.0 Hz
These four parameters specify the center of the skip speed zones.