INSTALLATION
Mount the socket in a suitable enclosure. A NEMA
approved enclosure, designed for socket-mounted relays,
is available from Time Mark Corporation.
Connect the 3-phase power to terminals 3, 4 and 5 on the
socket. Phase rotation may be verified using a Time Mark
Model 108A or 108B Phase Sequence Detector.
Connect the load control wiring to the appropriate terminals
on the socket. The SPST contacts (pins 6 and 7) are
electrically isolated from the SPDT contacts.
For motor control and phase loss alarm applications;
use the SPDT contacts.
For auxiliary indicator applications; use the appropriate
SPST contacts.
Insert the Model 252 into the socket.
Apply power. If the contacts do not transfer, (TRIP indica-
tor-On ), check that all phases are present and of the
correct voltage. If power is correct, rotate the level
adjustment counter-clockwise.
If the contact still does not transfer, remove power and
reverse two of the three phase wires at the socket (phase
rotation is reversed). Re-apply power. The contact should
transfer to provide a signal path between both sets of
normally-open contacts. The green LED (NORMAL)
should be lit.
Note: When installing the Model 252 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 contaminants into the base and socket area.
ADJUSTMENT
The following procedure will adjust the Model 252 to trip
below the nominal voltage.
Rotate the level adjustment clockwise, until the relay
contact transfers (TRIP indicator On). Slowly turn the
adjustment counter-clockwise, until the contact resets.
This setting will be correct for most applications.
Should nuisance tripping occur, turn the adjustment slightly
farther counter-clockwise, lowering the trip level. A more
accurate adjustment procedure requires a 3-phase variac,
allowing the voltage to be lowered to a specific voltage.
The Model 252 can then be set to trip at this precise
voltage level, when installed in the motor control circuit.
Factory set versions are also available.
TROUBLESHOOTING
Should the Model 252 fail to operate properly, check that
all three voltages are present and are of the correct level
and phase rotation (a Model 108A or 108B Phase
Sequence Detector may be used to verify phase rotation).
Check all fuses and verify that all wiring connections are
correct. Should problems persist, contact the manufacturer
at 800-862-2875.
WARRANTY
The Model 252 3-Phase Monitor is covered by Time
Mark Corporation’s exclusive 5-Year Unconditional War-
ranty. Should this device fail, for any reason, within five
years from the date of purchase, we will repair or replace it,
free. Contact the Time Mark Sales department for further
information.
PIN DIAGRAM
A
B
C
MODEL 252
3-Phase 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 252.
ALL ELECTRICAL POWER SHOULD BE REMOVED WHEN CONNECTING OR DISCONNECTING WIRING.
THIS DEVICE SHOULD BE INSTALLED AND SERVICED BY QUALIFIED PERSONNEL.
Installation Instructions
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. 87A373 12/00
© 2000 TIME MARK CORPORATION
11440 East Pine Street
Tulsa, Oklahoma 74116
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