MODEL 2581
3-Phase Monitor
ll Detects Phase Loss, Low Voltage
and Phase Reversal
ll Encapsulated Circuitry
ll LED Status Indicator
ll 1/4” Quick-connect Terminals
TYPICAL APPLICATION
DESCRIPTION
The Model 2581 3-Phase Monitor is designed to
continuously monitor 3-phase power lines for phase
loss, low voltage and phase reversal. The Model 2581
Monitor will detect phase loss on a loaded motor even
when regenerated voltage is present.
This device consists of a solid-state 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 .
The Model 2581 3-Phase Monitor does not require a
neutral connection and can be used with Wye or Delta
configured systems. Low voltage trip point is factory
set at 10% below nominal. An LED indicator is provided
for system troubleshooting.
L1
L2
L3
M
M
M
MOTOR
O/L's
START
STOP
CONTROL
VOLTAGE
MODEL
2581
M
DIMENSIONS - 208 to 240V versions
0.75"
.25" dia.
typ.
.25" male
quick connect
2.0"
2.0"
1.38"
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. 87A459 12/00
© 2000 TIME MARK CORPORATION
11440 East Pine Street
Tulsa, Oklahoma 74116
SPECIFICATIONS
Model 2581-208 2581-220 2581-240 2581-480
Nominal Voltage (phase to phase)
208VAC 220VAC 240VAC 480VAC
Trip Point 189VAC 200VAC 218VAC 436VAC
Trip Point Tolerance ± 2%
Frequency 60 Hz
Power Consumption 1.5W 1.65W 1.86W 4.5W
Transient Protection 2500 VRMS for 10msec
Repeat Accuracy ±0.1% (fixed conditions)
Response Time 50 msec (set or reset)
Dead Band Approx. 4%
Contact Rating SPDT 10 amps at 240VAC resistive
Expected Relay Life Mech:10 million operations
Elec: 100,000 operations at rated load
Operating Temperature - 40º to +131º F
Humidity Tolerance 97% w/o condensation
Enclosure Material ABS plastic
Agency Approvals Recognized to U.S. and Canadian
requirements under the Component
Recognition Program of Underwriters
Laboratories, Inc.
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