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Page 26
DFS-1 Manual Revised 7/95
POWERTEC Ind. Corp.©
20. ANALOG INPUT #1 HIGH
ENGINEERING UNITS (EGU)
USE PARAMETER #18 TO SELECT THE MAXI-
MUM ANALOG INPUT #1 EFFECT.
RANGE OF VALUES: FFFE 7961h to 0001 869Fh
-99,999 to +99,999 (dec.)
Default Value: 0000 06D6h 1750 (decimal)
(See Parameter 14 for the definition
and purpose of EGU)
Parameter #20 sets the maximum level for
effectiveness of Analog Input #1 at the highest signal
level.
Assume that the maximum speed of the 1750
RPM motor is set to 12500 EGU’s in parameter #14
(representing, perhaps, 125.00 RPM on an extruder
screw) and the Analog input is set for a Speed
Reference Input of 0 to +10VDC. The default value
of parameter 20 is 1750. This means that when
10VDC is present at Analog Input #1, the resulting
speed will be 1750/12500 = 14 percent of maximum
speed, or 245 RPM.
Now, if we want to set the maximum speed of
this system at 100.00, we set a value of 10000 in
parameter #20. This means that when 10VDC is
present at Analog Input #1, the motor will run at a
speed of 10000/12500 = 80 percent of the maximum
speed of the motor, or 1400 RPM. (see also param-
eter #19).
21. ANALOG INPUT #2 MODE
SELECT
USE PARAMETER #21 TO SELECT THE PUR-
POSE OF A SIGNAL AT ANALOG INPUT #2.
RANGE OF VALUES: 0000 0000h to 0000 001Fh
0 TO 32 (decimal)
Default Value: 0000 0000h 0 (decimal)
See parameter #17. The operation of Analog
Input #2 is identical to the operation of Analog Input
#1, EXCEPT the parameters which set the form of
the input signal (#22) and low and high EGU’s ( #23
and #24).
Both Analog Inputs #1 and #2 may be set up as
General Purpose Inputs, but all other modes are
mutually exclusive. If one of the Analog Inputs is set
up as a Speed Reference Input, the other Analog
Input may not be set up as a Speed Reference Input.
Attempting to set up a second Analog Input as a
Speed Reference Input when one is already set up in
that mode will cause the second input to be inopera-
tive.
22. ANALOG INPUT #2 SIGNAL
CONDITIONING
USE PARAMETER #17 TO SELECT THE FORM
OF THE SIGNAL AT ANALOG INPUT #1.
RANGE OF VALUES: 0000 0000h to 0000 001Fh
0 TO 32 (decimal)
Default Value: 0000 0000h 0 (decimal)
See parameter #18. Signal conditioning selection
for Analog Input #2 is identical to Analog Input #1.
23. ANALOG INPUT #2 LOW
ENGINEERING UNITS (EGU)
USE PARAMETER #23 TO SELECT THE
MAXIMUM ANALOG INPUT #2 EFFECT.
RANGE OF VALUES: FFFE 7961h to 0001 869Fh
-99,999 to +99,999 (dec.)
Default Value: 0000 0000h 0 (decimal)
Analog Input #2 works exactly the same way
that Analog Input #1 works. Parameter #23 does for
Analog Input #2 what parameter #19 does for Analog
Input #1. Refer to parameter #19.
24. ANALOG INPUT #2 HIGH
ENGINEERING UNITS (EGU)
USE PARAMETER #24 TO SELECT THE
MAXIMUM ANALOG INPUT #2 EFFECT.
RANGE OF VALUES: FFFE 7961h to 0001 869Fh
-99,999 to +99,999 (dec.)
Default Value: 0000 0000h 0 (decimal)
Analog Input #2 works exactly the same way
that Analog Input #1 works. Parameter #24 does for
Analog Input #2 what parameter #20 does for Analog
Input #1. Refer to parameter #20.