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100 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What ate timers used commonly in? |
PLCs. |
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What do contacts on timers do? |
Open and close to energize a circuit after an amount of time has passed. |
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What kind of coil does a timer have? |
An electromechanical timing coil. |
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What will any timing function have? |
Instantaneous NO and NC contacts, and NO and NC timing contacts. |
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What are the two types of timing control? |
On delay and off delay. |
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What is on delay also called? |
TON |
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What is off delay also called? |
TOF |
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What does a TOF contact look like in a diagram? |
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What do TON contacts look like in diagrams? |
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What does on delay refer to? |
It refers to when timing will start. |
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When does timing start on a timer on delay relay? |
Timing starts when the coil is energized. |
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What changes state on an on delay timer when the coil is energized? |
The instantaneous contacts. |
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When do the timing contacts on an on delay relay change state? |
When the preset time is reached. |
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How long do the contacts stay operated on an on delay timing relay? |
Until power is removed. |
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What happens if power is removed from the timing coil of an on delay relay? |
Timing stops. |
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Do the TON relays in lab have instantaneous contacts? |
They do not. |
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What happens in this circuit? |
The Blue light turns on after five seconds of the push button being held. |
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What does TOF delay refer to? |
It refers to when timing will start. |
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What happens as soon as a TOF coil is energized? |
The timing contacts change state. |
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When does a TOF start timing? |
When power is removed. |
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How long do contacts stay in their changed state on a TOF |
Until power has been removed for the allotted time. |
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How do you reset a TOF? |
There is no good way to reset it. |
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What are timers primarily used for? |
Fault detection. |
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What are some general things timers can be used for? |
Fault detection, position setting and denounce, allowing for dwell, or soft soft start applicators. |
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What are solid state timers? |
They are microprocessor based. |
Based |
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How is the timing range selected on solid state timers? |
Using switches in the housing. |
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How are time set points entered on solid state timers? |
Using a keypad. |
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How are time set points and accumulated time displayed on solid state timers? |
On an LCD display. |
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What is a security function that solid state timers have? |
A lock function that requires a pass code to change the presets such as time. |
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What can solid state timers be used as? |
Both timers and counters. |
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Which is more accurate, a solid state timer or an electromechanical timer? |
Obviously a solid state timer. Geez. |
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How accurate are solid state timers for count operations? |
100% accurate. |
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How accurate are solid state timers for timing? Give me a percentage and a time in milliseconds. |
Within 50 ms or 0. 5% accurate for timing operations. |
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How do you draw a circuit with a solid state timer? |
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Which pins should you not apply voltage to on a solid state timer? |
5, 6, +7. |
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Which pins on a solid state timer should you not control the voltage to? |
2 and 10. |
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What is special about pins five and ten on a solid state timer? |
They are linked. |
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What can be hooked up to pins 5, 6, +7? |
Dry contacts only. Ex. Relay contacts, timing contacts, PB contacts. |
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What do synchronous motor timers have? |
Clutch and motor. |
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When we're synchronous motor timers commonly used? |
In the past. |
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Where were synchronous motor timers used? |
On relay based equipment where long delay timers are required to control processes. |
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What has happened to relay controlled machinery as time has gone on? |
They have been replaced with PLC control |
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What types are synchronous motor timers available in? |
Reset type, repeat cycle type, and manual set type. |
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What do reset timers use? |
A clutch and a motor. |
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How many contacts do most reset timers have? |
Three contacts. |
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What are the contacts on a synchronous motor timer used for? |
To provide output to the electrical circuit. |
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What conditions do the contacts on a synchronous motor timer have? |
Reset - clutch and motor deenergized Timing - clutch energized Timed out - motor deenergized |
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What is this? |
Timer clutch |
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What is this? |
Timer motor |
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Label |
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When do the contacts on reset timers change from reset to timing? |
When the clutch is deenergized. |
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When do the contacts on a reset timer change from timing to timed out? |
When the motor has run for a preset time. |
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When do the contacts on a reset timer change from timed out to reset? |
When the clutch is deenergized. |
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No question, just look over this please... |
Thank you |
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What is a repeat cycle timer used for? |
It is used to control several electrical circuits in a predetermined sequence. |
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What is a manual set timer require? |
It requires manual operation to start timer. |
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What does a manual set timer run? When does it stop? |
A selected time. It stops automatically. |
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Are electromechanical counters used commonly nowadays? |
They were commonly user in the past, but have bow been replaced by PLCs. |
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What is a counter similar to? |
A reset timer. |
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What type of motor does an electromechanical counter use? |
It uses a stepper motor in place of a synchronous motor. |
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What happens each time a stepper motor is deenergized, in the context of an electromechanical counter. |
It advances one step. |
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What happens to a counter's contacts after the motor advances a preset number of steps? |
They change state. |
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What does an electromechanical counter require? |
. 5 seconds of off time between input pulses. |
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How many contact states does an electromechanical counter have? |
Three. |
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What are the contact states of an electromechanical counter? |
Reset, counting, and counted out. |
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Are solid state timers uncommon and not flexible? |
No! In fact they are both common and flexible! |
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What are solid state counters similar to? |
Solid state timers. |
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Have solid state counters still used? |
Yes, they are still widely used. |
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Are solid state counters fast? What is their accuracy level? |
Very fast, and 100% accurate. |
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What do solid state counters do? |
They count up or down to a set point. |
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Are solid state counters programmable? |
Yes. |
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What type of displays do solid state counters have? |
LCD displays. |
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When does a solid state counter start an index? |
When it receives a 0 on pin 6. |
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What does this circuit do? |
When the PB is pressed five times, the green light comes on. |
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What is terminal one on a programmable multifunction timer/counter? |
Moveable one, or common. |
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What is pin two on the timer thing? |
Power, or 24 volts. Positive input. |
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What is pin three on the timer thing? |
NO 1 |
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What is pin four on the timer thing? |
NC 1 |
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What is pin 5 on the counter thing? |
External Sw. Common. |
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What is pin 6 |
External Sw. Control. |
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What is pin 7? |
Reset. |
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What is pin 8? |
NC 2 |
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What is pin 9? |
NO 2 |
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What is pin 10? |
Negative input. |
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What is pin 11? |
Moveable 2. |
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What setting do you use for timer on? |
A in first slot |
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What setting do you use for timer off? |
B in first slot |
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What is c in first slot? |
Interval on |
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What is d in first slot? |
Control off interval on |
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What is e in first slot? |
Recycle |
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What is f in first slot? |
Single cycle |
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What is g in first slot? |
Control on off delay |
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What is I in first slot? |
Pulse |
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What is j in first slot? |
Cumulative delay on operate. |
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What Is B in second slot? |
Divide by 10 |
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What is C in second slot? |
Divide by 100 |
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What is a, d-j in second slot? |
Normal count. |
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What is the range of the timer/counter settings? |
001 to 999 |
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What does CO stand for in relation to programmable timer counter? |
Operate at preset count. |
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What does CR stand for in relation to programmable timer/counter? |
Release at preset count. |
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