2–2 Define Your Control System Characteristics
Publication
65566.5.1 - October 1996
Each processor has three pairs of outputs for press valves
(6 outputs per processor, 12 outputs per system). The pairs are:
• Clutch 1 and Clutch 2 (Clutch and Brake)
• Auxiliary 1 and Auxiliary 2
• Micro-inch 1 and Micro-inch 2
Assign your press valves to specific outputs as follows:
If your press has Then use these outputs
one set of valves for clutch and brake Clutch 1 and Clutch 2 for both
auxiliary valves for other functions
such as soft" C/B and/or dump valves
Clutch 1 for clutch, Clutch 2 for brake
Auxiliary 1 and Auxiliary 2 for other
one additional set of valves for microinch Microinch 1 and microinch 2 for microinch
Important: If using dump valves to assist in controlling the brake,
you can program whether dump valves turn ON/OFF in unison with
or opposite to clutch valves. We cover this under Command Bits in
chapter 4.
Record your assignment of control system outputs on the worksheet.
There are two types of valve fault detection:
• internal – the valve checks itself for failure
• external – the control system checks a valve-actuated switch on the
spool or stem to verify that the valve cycles every stroke
The type of fault detection determines whether you use valve-stem feedback:
If
Y
our Valves Have
This Fault Detection
Then the Valve And your control system
internal
• closes automatically when it detects a fault
• will NOT open unless both solenoids work in unison
• has NO valvestem switches
omits valvestem feedback
external
• has valvestem switches
• provides an external signal of its valve position
(when valve is open, switch is ON)
must have valvestem feedback
Important: If one or more valves have valve-stem feedback, all
valves must have it or simulate it. We show you how in chapter 3.
Record the type of valve fault detection and valve-stem feedback.
2. Assign Valves to
Specific Outputs
3. Select the Type of
V
alve Fault Detection
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