Time Mark 18 Data Sheet
MODEL 18
TIME MARK is a division of
3-Phase Monitor
with Trip & Restart Delays
⚫ Detects phase loss, low voltage, phase reversal
⚫ 50Hz, 60Hz and 400Hz models
⚫ Automatic reset
⚫ UL Recognized in the U.S. and Canada
⚫ Five year unconditional warranty
DESCRIPTION
The Model 18 continuously monitors 3-phase
power lines for abnormal conditions. When
properly adjusted, the Model 18 monitor will
detect phase loss on a loaded motor even
when regenerated voltage is present.
This device consists of a microcontroller with a
voltage and phase-angle sensing circuit,
driving an electromechanical relay. When
correct voltage and phase rotation are applied,
the internal relay will energize. A fault
condition will de-energize the relay. When the
fault is corrected, the monitor will automatically
reset. An adjustable restart delay prevents
short cycling in compressor applications and
an adjustable trip delay prevents nuisance
tripping during power fluctuations.
The Model 18 does not require a neutral
connection and can be used with Wye or Delta
systems. Voltage ranges are sufficiently wide
to allow for proper adjustment to existing
conditions. Both “FAULT” and “NORM”
condition indicators are provided to aid in
adjustment and system trouble-shooting.
All versions of the Model 18 are available with
optional gold flashed silver contacts for low
current applications.
DIMENSIONS
SPECIFICATIONS
Model 18-120 18-208/240 18-480 18-380-50 18-120-400 18-208/240-400 18-415-50
Nominal AC
(phase to phase)
Adjustment range 85-120VAC 160-240VAC 380-480VAC 300-400VAC 85-120VAC 160-240VAC 340-440VAC
Frequency 60Hz 60Hz 60Hz 50Hz 400Hz 400Hz 50Hz
Power
consumption
Transient
protection
Repeat accuracy ± 0.1% of set point (fixed conditions)
Trip delay 1-30 sec.
Restart Delay 1-300 sec.
Dead band Approximately 2%
Output contacts SPDT 10 amps at 240VAC resistive
Expected relay
life
Operating temp -20° to +131° F
Humidity
tolerance
Terminal Torque 3.5 in. lbs. maximum
Wire Type Stranded or solid 14-28 AWG, 1/terminal
Enclosure
material
Mounting DIN Rail or Surface Mount
Weight 5.1 oz.
* Low Current
Options
Agency Approval UL Recognized (U.S. and Canada)
120VAC 208/240VAC 480VAC 380VAC 120VAC 208/240VAC 415VAC
1.4W 2.4W 3.7W 3.0W 1.4W 2.4W 3.3W
2500VAC for 10ms
(Low current options available for all models—See below)*
For low current applications: Models ordered with suffix “/SG” will have
silver with gold flash contacts (SPDT 5 amps at 120VAC resistive)
Mechanical: 10 million operations
Electrical: 100,000 operations at rated load
0 - 97% w/o condensation
NORYL plastic
(For use in a Pollution Degree 2 Environment)
11440 East Pine Stree t
Tulsa, Oklaho m a 7 4 1 1 6
02/2019
© 2019 TIME MARK CORPORATION
MODEL 18
TIME MARK is a division of
3-Phase Monitor
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 MODEL 18.
ALL ELECTRICAL POWER SHOULD BE REMOVED WHEN CONNECTING OR DISCONNECTING WIRING.
THIS DEVICE SHOULD BE INSTALLED AND SERVICED BY QUALIFIED PERSONNEL.
Installation Instructions
INSTALLATION
Mount the Model 18 in a suitable enclosure either to the
back panel of the enclosure using two #6 x 9/16 screws or
to a din rail (Mounting hardware is not included).
Connect terminals 1, 2, and 3 to the line side of the motor
starter. Phase rotation should be verified using a Time Mark
Model 108A or 108B Phase Sequence Detector.
Connect output relay to the control circuit.
For motor control applications: use terminals 4 and 6.
For phase loss alarm applications: use terminals 5 and 6.
Refer to wiring diagram for example of typical application.
Apply power. If the contact does not transfer (green light ON),
check that all phases are present, and of the correct voltage.
If power is correct, rotate the trip adjust control counterclockwise.
If the contact still does not transfer, remove power and
reverse two of the three phase wires at terminals 1, 2, and 3
(phase rotation is reversed). Re-apply power. The contact
should transfer to provide a signal path between terminals
4 and 6.
TYPICAL APPLICATION
ADJUSTMENT SETTINGS
The following procedure will allow the Model 18 to be adjusted
to achieve a trip point just below the nominal phase-to-phase
voltage, where the unit is applied:
Initially, set all adjustments fully counterclockwise.
Rotate the trip adjust control clockwise until the red (FAULT)
indicator illuminates.
Next, slowly rotate the trip adjust control in a counter-
clockwise direction, until the green (NORM) indicator
illuminates.
At this point, the Model 18 is the most sensitive to irregular
power line conditions. Adjust the trip delay as required to
prevent nuisance tripping due to power fluctuations or motor
start-ups. Adjust the restart delay as required for the
application.
A more accurate setting will require the use of a 3-phase
variac to lower the voltage to an exact measurable setting.
Time Mark also offers a factory set version of all models and
voltage ranges, for only a small additional charge.
TROUBLESHOOTING
Should the Model 18 Monitor fail to operate properly, check
that all three voltages are present, and are of the correct
voltage level and phase rotation (a Model 108A or 108B
Phase Sequence Detector should be used to verify phase
rotation). Check all fuses and verify that all wiring connections
are correct. If problems persist, contact your local Time Mark
Distributor, or the factory for assistance (Monday-Friday,
8 a.m. to 5 p.m. CST).
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.
11440 East Pine Stree t
Tulsa, Oklaho m a 7 4 1 1 6
02/2019
© 2019 TIME MARK CORPORATION
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