28176 Parallax Inc, 28176 Datasheet - Page 317

• Manufacturer Part Number: 28176
• Description: KIT PARTS PROCESS CONTROL W/TEXT
• Manufacturer: Parallax Inc

Specifications of 28176

• Accessory Type: Process Control
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: BASIC Stamp® 2 and Board of Education
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

Challenge 8-4 Solution
Challenge 8-5 Solution
Yes, a system can be controlled using integral alone, though response will be very slow
with low settings of K
appropriate in systems where disturbances are relatively small but long lasting.
Challenge 8-6 Solution
No, a system cannot be controlled on derivative drive alone over the long haul.
Temperature may stay fairly stable for a couple minutes as derivative bucks the change,
but the temperature will drift lower, eventually to room temperature. Derivative responds
to the rate at which error changes only, and is not based on the actual error.
Final Challenge Solution
Solutions will vary, as they will be unique for each system.
1. A positive error would remain and flow would stabilize to less than the setpoint.
2. Increasing gain would result in a smaller error, but would result in more
3. Decreasing gain would result in a larger error with fewer oscillations.
oscillations.
I
, and larger values can lead to excessive oscillations. It would be