Time Mark 2500, 2501 Data Sheet
MODEL 2500
TIME MARK is a division of
MODEL 2501
3-Phase Monitor
Monitors for Phase Loss or Reversal,
Low Voltage or Voltage Unbalance
Automatic Reset
Heavy Duty Output Contacts
UL Listed to U.S. and Canadian
Safety Standards
DESCRIPTION
The Models 2500 and 2501 3-Phase Monitors are
designed to continuously monitor the voltages of a 3-phase
power distribution system for abnormal conditions. The
monitors feature solid-state voltage and phase angle
sensing circuits which drive a SPDT electromechanical
output relay. A neutral connection is not required with either
the Model 2500 or 2501. This allows each model to be
connected to any three phase WYE or DELTA configured
power distribution system.
When the correct voltage and phase sequence is applied to
a specified Model 2500, the output relay will not energize.
An under voltage, phase reversal, phase unbalance or
phase loss condition will cause the output relay to
energize, even if regenerated voltage is present. Complete
power loss will not cause Model 2500 to trip.
When the correct voltage and phase sequence is applied to
a specified Model 2501, the output relay will energize. An
under voltage, phase reversal, phase unbalance, or phase
loss condition will cause the output relay to de-energize.
Each option on the Model 2500 or 2501 is adjustable
throughout its operating range. The adjustment pots and
LED indicators for VOLTAGE ADJUST, UNBALANCE
ADJUST and TIME DELAY are mounted on the front of the
unit, for easy access.
Seven versions of both the Model 2500 and the Model 2501
cover voltage ranges from 120 to 600 VAC. All models are
UL Listed to U.S. and Canadian safety standards.
TYPICAL APPLICATION - Motor
SPECIFICATIONS
Model
Nominal AC Voltage 120 208 240 380 415 480 600
Adjustment Range
Frequency 50/60Hz
Unbalance adj
range
Trip Delay adj range 1 to 10 seconds (1 sec increments)
Power Consumption 4.5W per phase
Repeat Accuracy ± 1% of full scale
Reset Time 150ms nominal
Reset Type Automatic
Dead Band 2% of full scale
Output Contacts SPDT 30 amps at 28VDC/300VAC 50/60Hz
Operating Temp - 4º to +131º F
Humidity Tolerance 0-97% without condensation
Enclosure Material ABS plastic
Weight 2 lbs. 5 oz.
Mounting Surface
Agency Approval UL Listed to U.S. and Canadian safety standards
2500-120
2500-208
2501-120
2501-208
84-114V 146-198V 168-229V 266-361V 290-394V 336-456V 420-570V
5 amps at 480/600VAC 50/60Hz 0.75 PF
DIMENSIONS
2500-240
2500-380
2500-415
2501-240
2501-380
2 to 10% per NEMA specifications
2501-415
2500-480
2501-480
2500-600
2501-600
Shows No Power Applied
11/2011
© 2011 TIME MARK CORPORATION
MODEL 2500
TIME MARK is a division of
3-Phase Monitor
MODEL 2501
READ ALL INSTRUCTIONS BEFORE INSTALLING, OPERATING OR SERVICING THIS DEVICE.
KEEP THIS DATA SHEET FOR FUTURE REFERENCE.
Installation Instructions
ADJUSTMENT
D A N G E R
• HAZARD OF ELECTRIC SHOCK, BURN OR
EXPLOSION
• POWER CONTROL & INSTRUMENT CIRCUITS MAY
BE SUPPLIED BY REMOTE SOURCES
• THIS DEVICE SHOULD ONLY BE INSTALLED OR
SERVICED BY QUALIFIED PERSONNEL
• TURN OFF ALL POWER SUPPLYING THIS DEVICE
BEFORE WORKING ON MONITOR
• FAILURE TO DO SO WILL RESULT IN DEATH OR
SEVERE PERSONAL INJURY
INSTALLATION
Mount the Model 2500 or 2501 in a stable location,
observing all precautions outlined in the statement
above. Mounting hardware is not included.
Connect the control wiring to the terminals with the
contact markings (refer to the diagram on the unit).
Markings shown on the unit are in the power off
condition. Apply power.
If the contacts transfer (NORMAL indicator-Off), check
the LOW, REVERSE, and UNBALANCE indicators for a
possible fault condition. If no indicators are lit, check
that all three phases are present and of the correct
voltage.
If all phases are correct and the LOW indicator is ON,
rotate the VOLTAGE ADJUST until the light just goes
out.
If the UNBAL indicator is ON, rotate the UNBAL
ADJUST until the light just goes out.
NOTE: During adjustment you may find the UNBAL
ADJUST and the TRIP DELAY adjustment has no
effect. Check for phase loss.
If the REVERSE indicator is ON, remove power and
reverse any two of the three input wires and re-apply
power. The contacts should transfer to the normal
condition (normally-open contacts open, NORMAL indicator-ON).
Note: During adjustment, you may want to install a
jumper across the control contacts or open circuit,
depending on your control configuration, to prevent
cycling the load on and off.
Rotate the VOLTAGE ADJUST to the desired percent of
nominal voltage, or slowly clockwise, until the contacts
transfer to the failed condition (LOW indicator-ON).
Slowly turn the adjustment counter-clockwise until the
contacts reset to the normal condition (LOW indicator-OFF;
NORMAL indicator-ON).
Remove the jumper from the control contacts, if installed.
This setting will be correct for most applications. If nuisance
tripping occurs, turn the VOLTAGE ADJUST slightly counterclockwise, or increase the trip delay time.
Any adjustments to the VOLTAGE ADJUST, to eliminate
nuisance tripping, should be made in small increments, until
the true nuisance trips are eliminated. Adjust the TRIP
DELAY and UNBAL ADJUST as required by the system.
TYPICAL APPLICATION - Shunt Breaker
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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