Chapter Six: Remote Operation How To Set The Softstart Control Rate
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How To Set The Softstart Control Rate
Each set point, A through E, can be assigned a different softstart rate. In addition, you can assign
a softstart rate for the valve open and valve close commands. If it is not necessary to utilize
softstart control in your process, leave the softstart rate at 100% (of F.S.).
The softstart control rate is always expressed as a percent of the valve’s full speed. The softstart
rate can range from 0.1 to 100%.
How To Set the Softstart Rate
Issue the RS-232 command:
I
x
value
ENTER
where
x
= 1 for set point A
2 for set point B
3 for set point C
4 for set point D
5 for set point E
6 for the analog set point
7 for valve open
8 for valve close
value
= softstart rate, expressed as a percent of full speed
(between 0.1 and 100%)
How To Use the Softstart Rate
The use of the softstart rate for the active set point is controlled by digital logic input (pin 7 on
the I/O connector). This applies whether the set point is selected through the RS-232 command
described above, or through the digital input logic. Refer to Table 10, page 34, for the digital
input pinout.
The RS-232 command allows you to select the softstart rate, whereas the state of pin 7
determines whether the softstart rate is used.
To activate softstart control:
•
Hold the softstart line low (pin 7 on the I/O connector)
Hold the TTL low signal for a minimum of 50 milliseconds. If the line is
not
held low, the valve
will move at 100% full speed.
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