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Term 3 - Electronics > Liebert Notes > Flashcards

Liebert Notes Flashcards

1
Q

A call for heat/cool is sent as input through the ________ which becomes an output (command)

A

microprocessor

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2
Q

Lieberts use industry standard triacs rated at a ___amp capacity

A

2amp

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3
Q

If a load is removed from the triac, you can get a false reading due to potential voltage. True or False?

A

True

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4
Q

On a Liebert, the gate connects the ______-_______

A

opto-isolator

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5
Q

The pin/dot on the opto-isolator represents?

A

Location of pin 1

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6
Q

Input pin 1 is ___volts

A

AC (24v prior and 1.2v at opto)

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7
Q

Output pin 1 is ___volts

A

DC (5vdc)

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8
Q

Pin one is the voltage being received by the opto. True or False?

A

True

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9
Q

Pin 2 on the input opto completes the AC source to ______/_______

A

neutral/ground

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10
Q

Pin 2 on an output opto completes the DC source to ______-_______

A

digital-ground

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11
Q

Input Opto has no voltage signal on what pins?

A

3,6

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12
Q

Pin 4 and 5 on input opto?

A

Pin 4 completes DC source to digital ground.

Pin 5 receives Dc signal to microprocessor (5v when not activated and 0v when activated)

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13
Q

Output opto has no voltage signal on what pins?

A

pin 3,5

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14
Q

Pin 4 and 6 have what function on output opto?

A

Pin 4 completes 24Vac path to gate of the triac

Pin 6 receives AC source signal from input device

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15
Q

Output Opto 1-2 pins are __v when conducting and __v when not conducting

A

0v

5v

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16
Q

Purpose of the opto-isolator is to provide isolation of ___ voltage sources

A

two

17
Q

Opto-isolators allow a DC voltage to activate an AC load or allows an AC voltage source to provide a ____ signal

A

DC

18
Q

Two types of Opto isolators are?

A

Input and Output Opto

19
Q

Difference between input and output opto?

A

Input provides DC signal and Output allows DC source to activate an AC load

20
Q

The output-opto uses a DC source to activate a ____ internal to the IC chip. This causes a triac, also internal, to switch on allowing current flow to the AC load

A

LED

21
Q

What is the purpose of the ribbon cable on the leibert?

A

status and alarm lights

22
Q

When is the hot gas bypass coil energized?

A

When evap press temp is too low, HGBV opens and allows hot gas to mix with refrigerant

23
Q

Purpose of HGBV?

A

reduce cooling capacity and defrost coil

24
Q

Humidifier pan fills with water based on ?

A

time (9.5min for 40sec)

25
Q

The leibert filter clog is nuisance tripping. How to resolve?

A

disconnect the switch

26
Q

The Leibert requires water in the infrared humidifier pan. How to make this happen electrically?

A

Put factory jumper on Q12

27
Q

How is auto flush control accomplished on Leibert Level O?

A

Programming

28
Q

INput-optos isolate what voltages?

a) AC voltage control of DC voltage
b) DC control of AC voltage
c) Are not used on Level O controls

A

a)

29
Q

Output-optos isolate what voltages?

a) AC voltages control of DC voltage
b) DC voltage control of AC voltage
c) Are not used on Level O controls

A

b)

30
Q

What device activates the gate of the triacs?

A

OPTO

31
Q

What does EPROM stand for?

A

Erasable programmable read only memory

32
Q

What precaution must be taken when checking bulbs of infrared humidifier lamps?

A

do not look directly at bulbs

33
Q

What precaution must be taken when changing bulbs of infrared lamps?

A

Do not touch bulbs with bare hands

34
Q

What device will prevent Leibert from starting immediately when power is resumed after a power failure? what is the max delay?

A

Sequential auto restart

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Term 3 - Electronics (6 decks)

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