LINK Systems OmniLink II Press Automation Control - Manual (Page 69)

August 30, 2002 Manual Version 1.0 4.20
Section 4.2.2.5 Calibrating Percent Motor Load
If an input signal is provided to the OmniLink Analog Input/Output board as shown in Figure 2.16, this
input must be calibrated to show correct Percent Motor Load. The calibration procedure is as follows.
1. Turn on the main press drive motor and place an ammeter on a motor lead. Do not stroke the press.
This would cause variation in the motor current.
2. Read the current being drawn by the ammeter, divide the ammeter current by the full load current of
the motor and multiple the result by 100. This is the Percent Load you are drawing while not
stroking or stamping and should normally be less than 30%. The full load current of the motor
should be on the motor legend plate or available from a table.
3. Enter numbers by trial and error into the Percent Load Cal # until the Percent Load Reading at the
bottom of the screen agrees with the number you calculated in step 2. Start with a Cal # of 2000.
Note! The Percent Load Reading displayed varies inversely with the Cal #. If the Cal # of 2000
produces a Percent Load Reading that is higher than you calculated in step 2, increase the Cal #. If
lower than your calculation, decrease the Cal #. You are finished when a Cal # produces the same
Percent Load Reading that you calculated in step 2.
Section 4.2.2.6 Setting Speed Parameters
Speed Parameters should only be set for variable speed presses equipped with the OmniLink Analog
Input/Output option and with press speed set by the OmniLink analog speed input.
The purpose of the Prod. Mode Min SPM setting is to prevent operator entry of stroking speeds below
the minimum stroking speed recommended by the press manufacturer when the press is used in a
production mode. This could cause both motor overload and sticking on bottom because of insufficient
flywheel energy when stamping. If you don’t want to use this feature, simply leave its setting at zero. If
you do want to set a minimum speed entry when in a production mode, enter the minimum speed setting.
The purpose of the Setup Mode Fixed SPM parameter is to allow the user to enter a fixed speed that the
OmniLink analog speed output will automatically set when a setup mode (usually INCH) is selected on
a variable speed press. This feature requires a setup mode input as shown in Figure 2.16.
Section 4.2.3 Top Stop Calibration Menu Settings
Both stopping time and stopping distance (in degrees) vary greatly with press speed and depend on die
weight and counterbalance pressure (if the press has a counterbalance).to a lesser degree. Before
calibrating top stop for the OmniLink II press and Automation Control, it is advisable to set a die in the
press and adjust the counterbalance (if the press has a counterbalance) to the proper pressure for the
upper die weight used. It is preferable to use a die that has one of the heaviest upper die weights used in
the press, since this can then be used to determine the Brake Monitor settings that you will make next as
prescribed in Section 4.2.1.8. If you do place a die in the press for this calibration procedure, adjust the
slide shutheight so that the dies don’t close as you perform the top stop calibration and the following
Brake Monitor settings.
The Top Stop Calibration menu, shown in Figure 4.12, is reached by pressing the Top Stop Calibrate
softkey in the Main Configuration Menu.