Industrial Controls and Troubleshooting Module Flashcards
What is the purpose of a master control relay?
To remove control power from a control system
Machine logic is the _________ _________ portion of a machine.
decision making
A switch is a discreet input to a logic device, which means it is either ___________ or ___________.
On or Off
What are three types of safety shutdown switches?
Pressure switches
Temperature switches
Emergency stop switches
What are 6 types of process control switches?
Limit switches
Pressure switches
Temperature switches
Photocells
Float switches
Solids level switches
What are 3 types of operator input switches?
Push Buttons
Selector switches
Foot Pedals
Define output devices;
Output devices change a small control signal into useful work.
Relay logic is called _______________ logic because the logic is determined by the wiring connections.
hard-wired
To open or drop out a sealed-in relay, you must momentarily ___________ the power from the relay ____________.
Remove
Coil
Define a Symptom.
A symptom is a signal that something is wrong with a machine.
List 4 senses you can use to identify an equipment malfunction.
Sight
Hearing
Touch
Smell
What are 5 measurable senses?
Electrical measurements
Temperature measurements
Vibration measurements
Fluid flow measurements
Fluid pressure measurements
List 3 sources of information that you can use to find the cause of equipment malfunction.
Schematics
Your knowledge of the equipment
Any required test equipment
List 3 things that cause analysis can provide.
-Indicate if other problems exist in the system
-Prevent that type of equipment in the future
-Provide written record of failure for future reference
-who cares
