Time Mark 2722 Data Sheet
3.5"
4.5"
2.25"
3.13"
4.8"
4.0"
MODEL 2722
MAX CURRENT - MIN CURRENTMAX CURRENTMAX CURRENT
MAX CURRENTMAX CURRENTMAX CURRENT
100 = %
TIME MARK is a division of
Current
Unbalance Detector
Monitors 3-phase AC Current
Compares Three Single-phase Motors
Detects Open 3-phase Heating Element
UL Recognized; CSA Certified
Automatic or Manual Reset
DESCRIPTION
The Model 2722 Current Unbalance Detector is
designed to monitor 3-phase AC current (or compare three
single-phase AC currents). A solid-state electronic sensing
circuit drives an internal DPDT relay which energizes
during normal, balanced conditions. An unbalanced
condition will cause the relay to drop out. The formula for
an unbalance is:
The Model 2722 accepts current inputs up to 5 amps and
will consider zero amps as balanced (relay stays
energized), making the device suitable for use with 3phase heaters.
The Model 2722 has adjustments for percent of unbalance
and time delay before tripping. It will automatically reset
upon restoration of correct current balance, or a normallyclosed momentary switch can be connected for a manual
reset. External CT’s can be used to extend the operating
current range.
DIMENSIONS
SPECIFICATIONS
Model A2722 B2722 C2722
Input Voltage 24VAC 120VAC 240VAC
Input Voltage Range 20-28VAC 100-130VAC 190-250VAC
Power Consumption
VA Burden 0.5VA per phase
Frequency Range 50 - 400Hz
Current Range 1 - 5 amps AC
Transient Protection 2500V for 10ms
Unbalance Adjustment 2% to 25%
Trip Delay
Output Contacts DPDT 10A at 240VAC resistive
Expected Relay Life Mech: 10 million operations
Operating Temperature - 20º to +131º F
Humidity Tolerance 0-97% w/o condensation
Enclosure Material ABS plastic
Weight 1.35 lbs
Agency Approvals UL Recognized CSA Certified
1.5W max.
0.2 to 20 seconds ± 5%
Elec: 100,000 at rated load
11/2011
© 2011 TIME MARK CORPORATION
Optional Manual Reset
Start
Stop
AC
A B
C
Reset
Motor
AC SUPPLY
to Shut-Off or Process Control Circuit
RESET
Alarm
Bell
AC SUPPLY
SCR
Proportional
Control
3-Phase
Heating Elements
AC A CB
Rst
MODEL 2722
TIME MARK is a division of
Current Unbalance Detector
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 2722.
ALL ELECTRICAL POWER SHOULD BE REMOVED WHEN CONNECTING OR DISCONNECTING WIRING.
THIS DEVICE SHOULD BE INSTALLED AND SERVICED BY QUALIFIED PERSONNEL.
Installation Instructions
INSTALLATION
Mount the Model 2722 in a safe location, observing all
precautions as outlined in the General Safety section
above.
Connect the 3-phase wires to the terminals marked A,
B, and C. Apply power to the AC connections.
Connect the control wiring to the opposite side of the
unit, to the terminals with the relay markings. These
markings show the relays in the de-energized condition
(Refer to Typical Application diagrams).
Unbalance occurs when the amount of current
unbalance is greater than the unbalance control setting
(UNBALANCE LED-On). The unbalance condition
starts the trip delay which, after time-out, causes a
tripped condition (TRIP LED-On; relay de-energized).
The unit automatically resets when the current
unbalance is less than the unbalance setting.
An optional manual reset is also available as shown in
the Typical Application diagram. Set the UNBALANCE
and TRIPPED delays as required.
TYPICAL APPLICATION: 3-Phase Motor
TYPICAL APPLICATION: 3-Phase Heater
Shows No Power Applied
TROUBLESHOOTING
Should the Model 2722 fail to operate properly, check
that three currents are present, and are of the correct
level. Check all fuses and verify that all wiring
connections are correct. Should problems persist,
contact the factory at (800) 862-2875 for assistance.
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
11/2011
© 2011 TIME MARK CORPORATION
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