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ExplainingVoltage Drop
JUNE 18, 2015
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REMINDER: This Webinar is being RecordedPlease Turn Off Cell Phones
House Cleaning
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About the Presenter
Larry has over 20 years’ experience working with heavy duty fleets. He is an outstanding trainer and uses his extensive experience to help his customers make the best choices for their electrical needs.
He has been awarded the prestigious Recognized Associate Award from the Technology & Maintenance Council. Larry’s knowledge of electrical systems enables him to help his customers identify and remedy a fleets’ electrical issues.
Larry Rambeaux | Southern Region Sales & Service Engineer
800-219-1269 | [email protected]
Voltage is electrical pressure.
Voltage drop is anyresistance that impedescurrent flow, causinga drop in voltage.
Red Lead = 12.5 VoltsBlack Lead = 0 ________ 12.5 Volts
What is Voltage?
CAP
VDC-AC
Hz% RANGE HOLD REL
MODE
HZ% °C°F
10ADC-A
C
mADC-AC
uADC-AC
10A
uAmA COM
V HZ%CAP°F °C
OFF
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Example on the positive side.
Red Lead = 12.5Black Lead = 12.5 ______ 0 Volts
How to Read Voltage Drop with No Current Flowing
CAP
VDC-AC
Hz% RANGE HOLD REL
MODE
HZ% °C°F
10ADC-A
C
mADC-AC
uADC-AC
10A
uAmA COM
V HZ%CAP°F °C
OFF
v
CAP
VDC-AC
Hz% RANGE HOLD REL
MODE
HZ% °C°F
10ADC-A
C
mADC-AC
uADC-AC
10A
uAmA COM
V HZ%CAP°F °C
OFF
v
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How to Read Voltage Drop with No Current Flowing
Example on the negative side.
Red Lead = 0.00Black Lead = 0.00 ______ 0 Volts
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How to Read Voltage Drop with Current Flowing
CAP
VDC-AC
Hz% RANGE HOLD REL
MODE
HZ% °C°F
10ADC-A
C
mADC-AC
uADC-AC
10A
uAmA COM
V HZ%CAP°F °C
OFF
CAP
VDC-AC
Hz% RANGE HOLD REL
MODE
HZ% °C°F
10ADC-A
C
mADC-AC
uADC-AC
10A
uAmA COM
V HZ%CAP°F °C
OFF
VV8.50VV
Example of performing a voltage drop check while the circuit is loaded.
Red Lead = 8.50Black Lead = 0.00 ______ 8.5 Volts
Red Lead = 7.00Black Lead = 0.30 ______ 6.7 Volts
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An example of testing with a variable load tester.
- Operator Sensitive- Repeatability Difficult- Does Provide a Load
Variable Load Testers
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Automated Tester With Fixed Load
Example of testing with a known fixed load.
- Easily Repeatable - Easy to Operate- Accurate
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Effects of Voltage Drop
The effects of voltage drop on engine crank ability on a WARM day.
Starter DrawAmps
Starter Circuit Resistance
Voltage Drop in Cranking Circuit
Cranking Speed Lost per 1 Volt
Total Cranking Speed Lost
1) 700 x .00075 = .525 x 30 = 15.75
2) 700 x .001 = .700 x 30 = 21.00
3) 700 x .0015 = 1.12 x 30 = 33.60
4) 700 x .002 = 1.40 x 30 = 42.00
IMPACT ON STARTER SPEED CAUSED BY VOLTAGE DROPGiven: For every 1 volt drop in cranking system you will lose 30 Rpm’s of cranking speed.
Examples:700 Starter Draw Amps @ 70˚ F1600 Starter Draw Amps @ 20˚ F1900 Starter Draw Amps @ 0˚ FCranking Circuit
1) New Specs - .0000752) Used Specs - .0013) Out of Spec - .00154) Out of Spec - .002
700 Amps @ 70˚ F
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Effects of Voltage Drop
The effects of voltage drop on engine crank ability on a COLD day.
Starter DrawAmps
Starter Circuit Resistance
Voltage Drop in Cranking Circuit
Cranking Speed Lost per 1 Volt
Total Cranking Speed Lost
1) 1600 x .00075 = 1.2 x 30 = 36
2) 1600 x .001 = 1.6 x 30 = 48
3) 1600 x .0015 = 2.56 x 30 = 76.8
4) 1600 x .002 = 3.2 x 30 = 96.0
IMPACT ON STARTER SPEED CAUSED BY VOLTAGE DROPGiven: For every 1 volt drop in cranking system you will lose 30 Rpm’s of cranking speed.
Examples:700 Starter Draw Amps @ 70˚ F1600 Starter Draw Amps @ 20˚ F1900 Starter Draw Amps @ 0˚ FCranking Circuit
1) New Specs - .0000752) Used Specs - .0013) Out of Spec - .00154) Out of Spec - .002
1600 Amps @ 20˚ F
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These testing procedures can be applied to any electrical circuit.
Voltage DropBatteryPositive
BatteryNegative
LightPositive
LightNegative
13
Questions & Answers
14
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