SPECIFICATIONS
Model
2500-120
2501-120
2500-208
2501-208
2500-240
2501-240
2500-380
2501-380
2500-415
2501-415
2500-480
2501-480
2500-600
2501-600
Nominal AC Voltage 120 208 240 380 415 480 600
Adjustment Range
84-114V 146-198V 168-229V 266-361V 290-394V 336-456V 420-570V
Frequency 50/60 Hz
Unbalance adj
range
2 to 10% per NEMA specifications
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 150 msec nominal
Reset Type Automatic
Dead Band 2% of full scale
Output Contacts SPDT 30 amps at 28VDC/300VAC 50/60 Hz
5 amps at 480/600VAC 50/60 Hz 0.75 PF
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
ll Monitors for Phase Loss or Reversal,
Low Voltage or Voltage Unbalance
ll Automatic Reset
ll Heavy Duty Output Contacts
ll UL Listed to U.S. and Canadian
Safety Standards
MODEL 2500
MODEL 2501
3-Phase Monitor
DIMENSIONS
TIME MARK is a division of
Telephone: Main - (918) 438-1220
Sales - (800) 862-2875
Fax: (918) 437-7584
E-mail: sales@time-mark.com
Internet: http://www.time-mark.com
Doc No. 87A429 12/00
© 2000 TIME MARK CORPORATION
11440 East Pine Street
Tulsa, Oklahoma 74116
TYPICAL APPLICATION - Motor
Shows No Power Applied
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 it’s 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.
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