Time Mark 208 Data Sheet
MODEL 208
TIME MARK is a division of
2.500"
1.900"
Rear View
ØC ØB ØA
Ø0.250
6 HOLES
Line Voltage & Phase
Sequence Detector
⚫ Indicates Normal Condition
⚫ Shows Missing Phase
⚫ Indicates Phase Sequence ABC or CBA
DESCRIPTION
The Model 208A & 208D Line Voltage & Phase
Sequence Detectors allows quick and easy
determination of phase sequence (either ABC or CBA).
Available in 50/60Hz and 400Hz versions, this unit 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,
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.
DIMENSIONS
SPECIFICATIONS
MODEL 208A-208/240V 208A-480V 208D-208/240V
Frequency 50/60Hz 400Hz
Connection Time Continuous
Leads Fly leads (22 ga/600V)
Weight 3.2 oz.
Enclosure Material ABS plastic
CONDITION
CHART
ABC ROTATION
CBA ROTATION
PHASE A MISSING
PHASE B MISSING
PHASE C MISSING
ABC CBA A B C
• • • •
• • • •
• • • •
• • • •
• • • •
LAMP(S) LIT
11440 Ea s t P i ne S t r e e t
Tu l s a , Ok la h o m a 7 4 1 1 6
06/2020
© 2020 TIME MARK CORPORATION
Voltage
Voltage
A
BC
A
B C
MODEL 208
TIME MARK is a division of
Line Voltage & Phase
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 208A 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 leads to the 3-phase power source as
shown on the back of the Model 208.
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.
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 1.
figure 2.
WARRANTY
This product is warranted to be free from defects in
materials and workmanship for one year. Should this
device fail to operate, we will repair it for one year 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.
11440 Ea s t P i ne S t r e e t
Tu l s a , Ok la h o m a 7 4 1 16
© 2020 TIME MARK CORPORATION
06/2020
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