Shadow 8 User Manual
1139300
Installation and Checkout
2-43
We recommend you carefully study the ANSI guidelines in Appendix D of the ANSI B11.1
standards before connecting Shadow 8 to a PLC. Appendix C of the standards, “Some
Considerations for Design of Microprocessor-Based Clutch/Brake Controls,” gives detailed
guidelines for using PLCs to control the clutch and brake on metal-stamping presses.
To ensure maximum safety, you must wire and program the PLC so it can detect an internal
component failure and immediately stop the press. Two of the three outputs from Shadow 8’s
control relays, labelled “N.O. 1,” “N.O. 2,” and “N.C.” (see Figure 2-23), must be connected
separately to a PLC.
Next, you must create a program that will check independently each input signal from the
Shadow 8 relays. The program should stop the press immediately if the input signals ever
differ. That way, a component failure within the PLC will be immediately detected. Also,
with Shadow 8 relays wired to the PLC separately, if one of Shadow 8’s control relay contacts
were to weld shut, preventing the stop signal to the PLC, the other relay contact would still
open to send the stop signal.
If you do not connect the control to the PLC properly, the PLC will not be able to read the
input signals correctly when a component in the PLC fails. Even though Shadow 8 signals a
stop, the PLC will not stop the press.
If the control is connected to a PLC instead of directly to the machinery, then the PLC must be
able to transfer Shadow 8’s control reliability capability to the press stop circuit. If this
capability is overridden or if the PLC cannot detect a failure of its own components, much of
Shadow 8’s protection features are lost even though Shadow 8 is working properly. This is
why it is essential that you do not override Shadow 8’s control reliability features when using
Shadow 8 with a PLC.
Wiring Shadow 8 Optional Control to a Wintriss Clutch/Brake Control
If you are connecting a Shadow 8 optional control to a Wintriss Clutch/Brake Control (WPC),
refer to the following figures at the back of the manual for the appropriate wiring diagram for
your specific WPC product:
•
WPC 2000 – Figure 5
•
WPC 1000, Old Style – Figure 6
•
WPC 1000, New Style – Figure 7
•
WPC II – Figure 8
•
WPC I – Figure 9
If you are connecting Shadow 8 optic heads directly to a WPC 2000 or “new-style” WPC
1000, refer to Appendix A for detailed wiring instructions and to figures 11 (WPC 2000) and
12 (WPC 1000 “new-style”) at the back of the manual. If you want to connect Shadow 8 optic
heads to an “old-style” WPC 1000, refer to Figure 13 for wiring schematics.
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