MODEL 2681
Voltage Band Monitor
SPDT Output in Standard Relay
Configuration
Monitors Over and Under Voltage
AC or DC Versions
Automatic Reset
DESCRIPTION
The Model 2681 Voltage Band Monitor is a dual set-point
voltage monitor. Input voltages between the upper and lower
set-points will cause the output contacts to pull in (contacts 1
& 3 closed) and the LED indicator to illuminate. Input
voltages above or below the set-points will cause the output
contacts to drop out (contacts 1 & 4 closed) and extinguish
the LED indicator.
The Model 2681 is available in AC or DC versions. AC
models of the 2681 are not frequency sensitive and can be
used on systems from 50 to 400 Hz. The voltage set-points
are screwdriver adjustable over a wide operating range.
The SPDT ouput configuration is identical to the configuration
of general purpose relays. This unit requires a standard 8pin socket for mounting.
DIMENSIONS
SPECIFICATIONS
2681 - AC VERSIONS
Nominal AC voltages
Max input voltage 32vac 160vac 250vac 285vac
Under voltage range 19-24vac 90-120vac 185-208vac 200-240vac
Over voltage range 24-29vac 120-150vac 240-270vac
Input frequency (Hz) 50 - 400 Hz
Nominal DC Voltage 12vdc 24vdc 28vdc 48vdc 110vdc 230vdc
Max input voltage 17vdc 32vdc 37vdc 62vdc 145vdc 270vdc
Under voltage range 10-12vdc 19-24vdc 22-28vdc 38-48vdc 85-110vdc 175-230vdc
Over voltage range 12-15vdc 24-29vdc 28-34vdc 48-58vdc 110-135vdc 230-260vdc
Power consumption ± 2 watts max
Set-point stability ± 0.5% of set-point
Dead band 2%
Polarity protection DC versions only
Trip response 0.5 sec fixed (± 0 .1 sec)
Reset time 0.1 sec
Output contacts SPDT
Contact rating 10A at 240vac resistive
Expected relay life Mechanical: 10 million operations
Operating temp - 20° to +122°F
Humidity tolerance 97% w/o condensation
Mounting 8-pin socket (*order separately)
Case material ABS plastic
Weight 5 oz.
24vac 120vac 208vac 240vac
208-240vac
2681 - DC VERSIONS
2681 - ALL VERSIONS
Electrical: 100,000 at rated load
* Order 8-pin socket number 51X120
PIN DRAWING
INPUT
7
6
5
1
8
2
3
4
Shown De-Energized
© 2015
TIME MARK is a division of
07/2015
TIME MARK CORPORATION
MODEL 2681
Voltage Band 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 2681 MONITORS.
ALL ELECTRICAL POWER SHOULD BE REMOVED WHEN CONNECTING OR DISCONNECTING WIRING.
THIS DEVICE SHOULD BE INSTALLED AND SERVICED BY QUALIFIED PERSONNEL.
Installation Instructions
INSTALLATION
The Model 2681 is a socket-mounted voltage band monitor.
The pin configuration diagram on the unit shows the contacts
in the power OFF, or tripped condition.
Connect the wiring to the socket as shown in the Typical
Application diagram. Observe the proper polarity of the
input voltage for DC models.
ADJUSTMENT PROCEDURE
NOTE:
When adjusting the Model 2681 you may wish to jumper the
control circuit contacts to prevent tripping the load on and off.
A variable voltage source and a digital voltmeter provide the
most accurate means of calibrating the trip point setting.
However, for AC line voltages, you can often obtain a satisfactory calibration by using only the AC line voltage.
1. Set the voltage source at the low level you wish the unit
to trip.
2. Slowly rotate the UNDER adjustment until the indicator
light just illuminates. Any voltage at or below this level
will now trip the relay.
3. Set the voltage source at the high voltage level you wish
the unit to trip.
4. Slowly rotate the OVER adjustment until the indicator
light just illuminates. Any voltage at or above this level
will cause the relay to trip.
5. Apply the nominal operating voltage.
The above calibrations will be correct in most applications. If
nuisance tripping occurs, turn the adjustments for a slightly
wider voltage band.
A reasonably accurate voltage setting can be obtained by
using only the operating line voltage. Apply the voltage and
follow steps 2 and 4 above.
Voltages approximately 2% to 4% above and below the
nominal voltage will now trip the relay. To prevent nuisance
tripping you may need to turn the adjustments slightly lower
and higher as needed.
NOTE: When installing the Model 2681 monitor in areas of
high humidity or contamination, it is recommended that the
base area and all exposed metal parts of the socket be
coated liberally with a good quality silicon grease, such as
Dow Corning DC-4 or DC-4X. Insert the unit into the socket
and wipe off excess grease around the base. This will prevent
the entrance of moisture and other contaminates into the
base and socket areas.
TYPICAL APPLICATION
Shows No Power Applied
TROUBLESHOOTING
Should the Model 2681 fail to operate properly, check that
voltage is present and is of the correct level. Check all
fuses, and verify that all wiring connections are correct.
Should problems persist, contact your local Time Mark
Distributor, or the factory at 800-862-2875 (Monday-
Friday; 8 a.m. to 5 p.m.CST), for further assistance.
WARRANTY
The Model 2681 Voltage Band Monitor is warranted to
be free from defects in materials and workmanship, and is
covered by our exclusive 5-year Unconditional
Warranty. If this device fails to operate, for any reason,
we will repair or replace it free, for five years from the date
of purchase. Contact the Time Mark Sales Department for
further details.
© 2015
TIME MARK is a division of
07/2015
TIME MARK CORPORATION
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