Time Mark 108A, 108D Data Sheet
1.2"
4.0"
2.25"
18" leads
A B
C
Model 108
MODEL 108A
TIME MARK is a division of
MODEL 108D
Line Voltage & Phase
Sequence Detector
Indicates Normal Condition
Shows Missing Phase
Indicates Phase Sequence ABC or CBA
Color-coded Leads
DESCRIPTION
The Model 108A & 108D Line Voltage & Phase
Sequence Detectors permit contractors and
maintenance personnel to quickly and easily determine
the proper phase sequence (either ABC or CBA), in
order to install, or make wiring changes to motors, wattmeters, transformers, electrical installations, power
factor meters or generators.
Available in 50/60Hz and 400Hz versions, this tool can
also show that all phases are present, or if one or more
phases are lost, it indicates which of the phases are
missing.
To use, connect the Detector to any 3-phase circuit from
90 to 600 volts, Wye or Delta. In proper phase sequence, and with all phases present, the ABC lamp, and
the three line voltage lamps will illuminate. An open
phase condition will illuminate both rotation lamps and
only two line voltage lamps. See the Condition Chart.
TYPICAL APPLICATION
SPECIFICATIONS
MODEL 108A 108D
Frequency 50/60Hz 400Hz
Phase Sequence Indicator 90 - 600VAC
Line Voltage Indicator 175 - 600VAC
Connection Time 90-480 V: Continuous
Leads 18” color-coded
Lead Termination Alligator clips
Weight 8 oz. max.
Enclosure Material ABS plastic
CONDITION
CHART
ABC ROTATION
CBA ROTATION
PHASE A MISSING
PHASE B MISSING
PHASE C MISSING
Over 480 V: < 15 minutes
LAMP(S) LIT
ABC CBA A B C
• • • •
• • • •
• • • •
• • • •
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DIMENSIONS
11/2011
© 2011 TIME MARK CORPORATION
Voltage
Voltage
A
BC
A
B C
MODEL 108A
TIME MARK is a division of
Line Voltage & Phase
MODEL 108D
Sequence Detectors
READ ALL INSTRUCTIONS BEFORE INSTALLING, OPERATING OR SERVICING THIS DEVICE.
KEEP THIS DATA SHEET FOR FUTURE REFERENCE.
GENERAL SAFETY
POTENTIALLY HAZARDOUS VOLTAGES ARE PRESENT AT THE TERMINALS OF THE MODELS 108A OR D
DETECTORS. ALL ELECTRICAL POWER SHOULD BE REMOVED WHEN CONNECTING OR DISCONNECTING
WIRING. THIS DEVICE AND WIRING SHOULD BE INSTALLED AND SERVICED BY QUALIFIED PERSONNEL.
OPERATOR INSTRUCTIONS
CONNECTION
Connect the three clip leads to the 3-phase power source.
Apply AC power. One of the detector lamps should illuminate
indicating the phase sequence as connected. If the desired
phase sequence is not lit, change any two of the three leads.
Read the 3-phase designation on the front panel; then
connect corresponding leads to your equipment. If both
lamps illuminate, check for a loss of voltage on one of the
three phases. If neither lamp illuminates, check for a loss of
voltage.
3-PHASE POWER BASICS
In 3-phase power, there are three lines which carry the
voltage normally designated as A-B-C. In some installations,
however, they may be designated L1-L2-L3, or T1-T2-T3.
The phase sequence as generated is A-B-C.
As the voltage on these lines rotates through 360 degrees,
phase B lags phase A by 120 degrees; while phase C lags
phase A by 240 degrees. The voltage on each of these lines
vary as shown in figure 1, a graph of voltage versus degrees
of rotation.
figure 1.
If all phases are shown on the same graph, they would
appear as shown in figure 2.
Pictured on a rotating phasor diagram, the angle
between each phase is fixed at 120 degrees as they
rotate in unison at the line frequency (see figure 3).
From figure 4, you can see if any two phases are
reversed, the direction of rotation will be in the opposite
direction. This reversal of the rotating sequence will
cause motors to run in the opposite direction. Many
other types of equipment are phase sensitive and will
not perform as intended if the phase sequence is
incorrect.
figure 3.
figure 4.
figure 2.
WARRANTY
This product is warranted to be free from defects in
materials and workmanship, and is covered by our
exclusive 5-year Unconditional Warranty. Should this
device fail to operate for any reason, we will repair it for
five years from the date of manufacture. For complete
warranty details, see the Terms and Conditions of Sales
page in the front section of the Time Mark catalog or
contact Time Mark at 1-800-862-2875.
11/2011
© 2011 TIME MARK CORPORATION
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