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Mission 40 · Pro Drives exercise

Trip, reset, restart on purpose

Handle a drive fault without a surprise restart.

P-101’s drive trips if the pump is overloaded. Start latches DriveRun and Stop wins. A drive fault (DriveFault) turns DriveRun OFF at once and cancels the run request. FaultLamp shows DriveFault. Send DriveReset while FaultReset is held, but only while DriveRun is OFF. After a reset, the pump stays OFF until someone presses Start again.

This mission is part of ProTry the full course, every mission and the expert challenges free for 7 days. No card needed.
The 3D pump skid this mission runs on Pro mission
Test replay

Trip, clear the cause, reset, then restart on purpose

Test 1 of 5
Set by the testChecked by the testStep 12 of 12 · 2.7 s
Level
Advanced
Time
About 25 min
Reward
+300 XP
Rig
3D pump skid
Siemens editors
SCL, LAD, FBD, GRAPH
Rockwell editors
Structured Text, Ladder, FBD, SFC
Course stage
25. Trip, reset, restart on purpose
Automatic tests

What the tests check

  1. A trip turns DriveRun OFF at once. Start does nothing while the drive is faulted.
  2. DriveReset follows FaultReset only while DriveRun is OFF. A press with the cause still there clears nothing.
  3. After a reset, the pump stays OFF until a new Start.
  1. Try it Use the buttons below the model and watch the rig respond.
  2. Test solution Every check runs on your code in one press.
  3. Replay If one fails, step through it one scan at a time to see why.
Why it matters

Where you’d see this on site

A pump's drive trips on overload. A fitter clears the blockage, and the operator resets the drive from the panel.

A reset that restarts the pump can injure the person who just fixed it. The pump must wait for a deliberate Start.

Where you'd find thisWater for the top floors

In a block of flats, a basement tank holds water from the mains. Two pumps push it up to the taps above. One runs while the other waits as a spare. A low-water switch stops the pumps before the tank runs dry.

  1. Street mainsWater enters the building
  2. Storage tankHolds a supply for the pumps
  3. Water pumpsPush water to the floors aboveYou are here
  4. Taps upstairsResidents use the water they need
On a real site: places, parts and safety
  • Block of flats — pushing water up to the top floors
  • Brewery — sending hot water to a brewing tank
  • Water-treatment works — moving water between filter tanks
  • Office building — pumping water round the heating pipes

A low-water switch can take away permission to run. The pump must stop before it runs dry and damages its seal.

The PLC can say ON even when a pump has failed. Check the measured flow as well as the command.

The Stop input in these exercises is not an emergency stop. Real machines also need guards, emergency stops and a safe way to cut the power.

The sizes, timings and cutaways are teaching choices, not a drawing of any one real installation.

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