Pneumatic Troubleshooting Mod 7- Systems

A regulator can cause a low pressure condition if it has a mechanical problem or if___________________.

• It has been mis-adjusted

• It is oversized

• Its element is clogged

• Its drain is open

A closed exhaust restrictor will prevent an actuator from moving by __________________.

• Blocking the inlet port to the actuator

• Exhausting excessive air to atmosphere

• Blocking the DCV’s spool

• Preventing air from leaving the actuator

A flow chart is based on the ___________________ method of troubleshooting

• Symptom and cause

• Output-back

• Shotgun

• Input-Forward

Slow actuator speed is commonly caused by ____________________.

• Flow control valves

• An increase in the pressure differential across the actuator

• Non-venting regulators

• High pressure

When an actuator moves out of sequence the __________________ is usually the cause.

• Control circuit

• Pneumatic components

• Hydraulic components

• Component settings

The PLC’s ___________________ can aid troubleshooting because they can be compared to the PLC’s program to correct sequencing.

• Terminals

• Indicators

• Relays

• Dip switches

A zero pressure condition occurs due to problems with compressors, _______________, and air leaks.

• Lubricators

• Exhaust restrictors

• Regulators

• Quick exhaust valves

If the __________________ of a regulator becomes blocked, pressure buildup downstream will not be relieved and can result in increased system pressure

• Spring

• Vent

• Inlet

• Drain

Which of the following methods of system level troubleshooting do experts recommend against using?

• Symptom and cause

• Half-split

• Output-back

• Shotgun

A (n) _____________ shows the status of inputs and outputs for each step of a PLC’s program sequence

• Sequence chart

• I/O list

• Electrical schematic

• Diagnostic chart