Time Mark 2742 Data Sheet
A
RESET
UNDER
CURRENT
AC B
C
L1
L2
L3
Control
Voltage
Lamp
Stop
Start
M
M
O/L's
MODEL 2742
3-Phase Over/Under
Current Monitor
⚫ Monitors over or under current
⚫ Fail-safe design
⚫ Automatic or manual reset
⚫ Adjustable trip delay timer
⚫ For use on motors, pumps, conveyors, etc.
⚫ Engineered and Built in the U.S.A.
DESCRIPTION
The Model 2742 3-Phase Over/Under Current Monitor is
designed to monitor the current level of a three-phase line or
to compare the currents of three single-phase lines.
The Model 2742 is factory-set as an over-current monitor; that
is, if one or more current inputs rises above the trip level, the
internal relay will de-energize. Adding a wire between the
UNDER CURRENT terminals on the case will cause the
Model 2742 to sense a decrease of one or more current
inputs.
An adjustable trip delay of 0.2 to 20 seconds will prevent
nuisance tripping. The current trip point is adjustable from 1 to
5 amps, and matching current transformers are available to
extend the current range of the monitor.
The Model 2742 will automatically reset when the current fault
is corrected. An external manual reset can be added by
installing a normally closed switch between the terminals
marked RESET.
TYPICAL APPLICATION
Over-current; auto reset; 5 amps
SPECIFICATIONS
Model 2742-24 2742-115 2742-220
Supply voltage 20-28VAC 100-130VAC 190-250VAC
Max supply voltage 30V 140V 260V
Power consumption 1.5 Watts max.
Transient protection 2500 VRMS for 10ms
Frequency range 50/60 Hz
Input current 1-5 amps ±5%
Max. input current 40 amps for 2 sec
Current range 1-5 amps ± 5%
Trip delay 0.2 to 20 sec ± 5%
Dead band 4% max.
Contact rating DPDT 10A at 240VAC resistive
Expected relay life
Operating temperature - 20º to +131º F
Enclosure material ABS plastic
Weight 1 lb. 5.9 oz.
Mech: 10 million operations
Elec: 100,000 ops at rated load
DIMENSIONS
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11440 Ea s t Pi ne S t re e t
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© 2020 TIME MARK CORPORATION
C
B
A
AC
RST
Reset
MANUAL RESET
C
B
A
AC
Jumper
Connection
RST
UNDER-CURRENT SENSING
MODEL 2742
3-Phase Over/Under Current Monitor
READ ALL INSTRUCTIONS BEFORE INSTALLING, OPERATING OR SERVICING THIS DEVICE.
KEEP THIS DATA SHEET FOR FUTURE REFERENCE.
POTENTIALLY HAZARDOUS VOLTAGES ARE PRESENT AT THE TERMINALS OF THE MODEL 2742.
ALL ELECTRICAL POWER SHOULD BE REMOVED WHEN CONNECTING OR DISCONNECTING WIRING.
THIS DEVICE SHOULD BE INSTALLED AND SERVICED BY QUALIFIED PERSONNEL.
INSTALLATION
Mount the Model 2742 in a suitable enclosure.
If the current to be monitored is 5 amps or less, break and
connect each wire to the three inputs of the Model 2742 (see
TYPICAL APPLICATION on front page). Observe polarity.
If the current to be monitored is greater than 5 amps,
install a current transformer on the line. Connect the
secondary leads of the CT to the Model 2742 terminals (see
TYPICAL APPLICATION on this page). Observe polarity.
Connect the operating supply voltage to the AC input
terminals.
Connect the load control wiring to the appropriate terminals.
For most motor control applications, use the normally open
contact(s), which will close when the current is within the
acceptable range. For alarm applications, use the normally
closed contact(s). Refer to the diagram on this page.
If a manual reset is desired, connect a normally closed push
-button across the RESET terminals (see figure 1). If under-
current sensing is desired, add a jumper connection (see
figure 2).
Turn on the supply voltage. The contacts should transfer and
neither indicator light should be lit.
ADJUSTMENT PROCEDURE
Set the SECONDS adjustment to the required amount of
delay. If the desired current trip level is known, set the
CURRENT adjustment to that point. A slight adjustment up or
down may be necessary to allow for tolerance inaccuracies.
NOTE: If the manual reset is used, press and hold the
reset button during this step. Usually a trip is desired only if
the current changes from the present nominal. To calibrate for
this turn the SECONDS adjustment to the maximum delay.
Turn the CURRENT adjustment up or down until the FAULT
indicator lights. Turn the CURRENT adjustment back, until
the FAULT light just goes out. Reset the SECONDS delay to
the previous setting.
GENERAL SAFETY
Installation Instructions
TYPICAL APPLICATION
Over-current; auto reset; 5 amps
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.
Shows No Power Applied
11440 Ea s t Pi ne S t re e t
Tu l s a , Ok l a h o m a 7 4 1 1 6
10/2020
© 2020 TIME MARK CORPORATION
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