LINK Systems OmniLink II Press Automation Control - Manual (Page 26)

August 30, 2002 Manual Version 1.0 2.17
Section 2.3.7 Wiring Optional Analog Input/Output Board Circuits
Section 2.3.7.1 Wiring to Display Motor Load Current
If the optional Analog Input/Output board is specified with the OmniLink II Press Automation Control,
and you wish to graphically and numerically display motor load current on the OmniLink II Operator
Terminal, refer to Figure 2.16. For fixed speed presses and presses with eddy current variable speed
drives, use a current transformer and an instrument transformer and wire as shown in the upper press
control illustration in Figure 2.16. These transformers will normally be supplied by Link if your order
indicated that motor load current display is desired.
DC Motor Drives and Adjustable Frequency AC Motor Drives will usually provide an analog motor
load current output of 0-10V or 4-20ma. Wire as shown in the lower press control illustration in Figure
2.16. If a 4-20ma output is used, throw position 3 of the 4-Pole switch on the Analog Input/Output
board to the closed position. If a 0-10V analog output is used, leave position 3 of the switch open.
In addition to the wiring described in this installation section, it will also be necessary to calibrate the
% Motor Load current displayed on the OmniLink Operator Terminal. This calibration is described in
Section 4.2.2.5 of this manual.
Section 2.3.7.2 Wiring the Analog Speed Input and Output
The optional Analog Input/Output board also allows you to display the drive SPM for electronic variable
speed drives on the OmniLink Operator Terminal, and to set the desired SPM with an analog voltage
output from the Operator Terminal rather than with a potentiometer or keypad on the drive itself.
Displaying drive SPM allows you to know how fast the press will stroke even when the clutch is not
engaged. Without this feature, you can only display the stroking speed while the press is actually
stroking.
To wire the isolated analog speed input and output, refer to figure 2.17. If you have an eddy current
variable speed drive, refer to the upper box labeled press control. If one side of the tach generator is
referenced to ground in the eddy current drive circuit, make sure position 1 on the switch located on the
right side of the Analog Input/Output board is closed. If the tach generator drives a bridge rectifier on
the eddy current drive, switch position 1 on the switch to open. The SPM OUT terminal on the Analog
Input/output board should be wired to the eddy current drive SPM input (the input that sets desired
speed). If desired, you may wire analog speed input only, leaving the speed setting to an existing
potentiometer or keypad, but it is generally better to integrate press speed setting into the OmniLink II
Operator Terminal.
To wire a DC Drive or an Adjustable Frequency AC variable speed drive, refer to the lower box labeled
press control in Figure 2.17. Position 1 of the switch on the right side of the Analog Input/Output board
should always be closed for DC or AC variable speed drives.
In addition to the wiring described in this installation section, it will also be necessary to calibrate the
drive SPM displayed on the OmniLink Operator Terminal and the output signal that sets the speed of the
variable speed drive. These calibrations are described in Sections 4.2.2.2, 4.2.2.3, and 4.2.2.4 of this
manual.