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1126800 SmartPAC 2 with WPC Integration
Page 28 Chapter 2 Installing SmartPAC 2 and WPC
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Provide NEMA 12 conduit and connections
Because SmartPAC 2 and WPC are rated NEMA 12 (protected against dust and oil),
you must use conduit of the same rating and make proper connections to ensure
NEMA 12 protection with the enclosure.
• Properly ground SmartPAC 2/WPC
Good grounds at SmartPAC 2 and WPC are important. Make sure SmartPAC 2 and
WPC are properly grounded.
The ground wire from SmartPAC 2 should be connected to the main ground point of
the press control. This may be in the area where the control transformer is grounded.
Finding a good place for a ground is sometimes difficult, but it should be close to
where the press receives its ground.
• Correctly Terminate All Cable Shields
Terminate all cable shields to the studs provided in the enclosure or to a good
grounding location. (See “How to Terminate Cable Shields,” page 31.)
• Install suppressors across inductive loads
All relays and solenoids that are controlled by SmartPAC or WPC must be
suppressed. Suppressors should be installed across the load and as close to the load as
possible. See Figure 2 - 25, “How to Connect Suppressors Across the Load,” page
89.
Never install the suppressor across the relay contacts. The suppressors tend to
fail shorted. In some cases, suppressors are required in the top stop and emergency
stop (E-stop) circuits. Additional suppressors can be obtained from the factory.