Rockwell Automation 1395 Digital Reference Adapter for RTP Applications - Manual (Page 33)

Publication 1395-RTP-5.2 - September 1997
Start-Up Instructions 5-3
The configuration shown provides the following setup:
• The digital inputs are ONLY connected to the Drive logic
state machine because their respective Set-up Parameter is set
to 16.
• The output of the Drive logic state machine and the Drive
reference state machine are connected to Source Parameter
400, which in turn is linked to Parameter 151 (Logic
Command 2).
• The example shows the digital reference input from encoder
channel A connected to Terminal board TB3-A23 and A24.
These terminals are connected to the Adapter Board via a
standard wiring harness to board connector, J2, pins 17 and
18 respectively. These signals are connected to opto-isolation
hardware and EPLD combinational logic, which is eventually
connected to the input of a microprocessor controlled
counting system. The output of the speed reference generator
is connected in software to Parameters 403 and 404. In
addition, these parameters are linked to Drive Parameters 154
and 153 respectively. Note that the digital reference has six
set-up parameters associated with it, which provide the
necessary interfacing and tracking information for the
reference encoder input to digital reference input values
transmitted to the main control board.
• Refer to Sheet 3 of Drawing 144041-18. The Drawing shows
analog input #1 connected as the dancer potentiometer wiper
input. The analog input has four Set-up Parameters associated
with it, which are further explained in the next section with
accompanying Figure 5-2. When an analog input is applied to
analog input #1, the signal is converted to a digital value and
directed to Parameter 401. Parameter 401 is then sent to the
P/I Regulator. The output from the P/I Regulator (P407)
becomes the Process Trim Reference (P161). Note also that
the output of the analog to digital converter is sent to the
internal adapter logic section to determine the three logic
signals of DCP, DMP and DFP.
• The Drive logic state machine is also linked via Parameter
405 to main control Parameter 163 which is Velocity Indirect
1. Parameter 163 has an associated pointer parameter 600
which has been set to Parameter 625. This indirect use of
parameters allows the Adapter Board to change the value of
Parameter 625, the torque reference select parameter, by
changing Parameter 405. Normally, Parameter 405 = 1 which
selects the output of the velocity regulator as the torque
reference. Only during the “Auto Slack Loose” state Mode 8,
will Parameter 405 change to 0 which sets the torque
reference to zero causing the Drive to phase back the
Armature supply SCR’s and the Drive to coast with the
contactor closed.