Time Mark 258 Data Sheet

MODEL 258

TIME MARK is a division of

3-Phase Monitor

 Detects phase loss, low voltage,

phase reversal

 50Hz, 60Hz and 400Hz models

 Automatic or manual reset

 Five year unconditional warranty

DESCRIPTION

The Model 258 continuously monitors 3­phase power lines for abnormal conditions.
When properly adjusted, the Model 258
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 (a manual reset version
is also available).

The Model 258 3-Phase Monitor does not
require a neutral connection and can be
used with Wye or Delta systems. Voltage
ranges are sufficiently wide to allow for
proper adjustment to existing conditions.

Both “TRIP” and “NORM” condition

indicators are provided to aid in adjustment
and system trouble-shooting.

SPECIFICATIONS

AUTO Reset
MANUAL Reset

Nominal AC voltage
(phase to phase)

Case Color Gray Red Yellow Yellow Gray Red Yellow

Adjustment range 85-120VAC 160-240VAC 380-480VAC 300-400VAC 85-120VAC 160-240VAC 340-440VAC

Frequency 60Hz 60Hz 60Hz 50Hz 400Hz 400Hz 50Hz

Pwr consumption 1.4W 2.4W 3.7W 3.0W 1.4W 2.4W 3.3W

Transient protection 2500VAC for 10ms

Repeat accuracy ± 0.1% of set point (fixed conditions)

Response time 50ms drop out

Dead band Approx. 2%

Output contacts SPDT 10 amps at 240VAC resistive

Expected relay life Mechanical: 10 million operations

Operating temp. -20° to +131° F

Humidity tolerance 0 - 97% w/o condensation

Enclosure material ABS plastic cover

Mounting 8-pin socket ( **sold separately)

Weight 5 oz.

Agency approvals

B258B

B258BM

120VAC 208/240VAC 480VAC 380VAC 120VAC 208/240VAC 415VAC

Electrical: 100,000 operations at rated load

*Conditions of acceptability: (1) the 380V and 480V versions must be used with a UL Recognized

600VAC socket. (2) For use in a Pollution Degree 2 environment (3) To be installed on the load side

258B

258BM

A258B

A258BM

EX258B

EX258BM

UL Recognized* and CSA Certified

of branch circuit protection rated 10A.

B258B-400

B258BM-400

258B-400

258BM-400

** Order 8-pin socket number 51X120

EX258B-415V

TYPICAL APPLICATION

DIMENSIONS

12/2012

© 2012 TIME MARK CORPORATION

MODEL 258

TIME MARK is a division of

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 258.

ALL ELECTRICAL POWER SHOULD BE REMOVED WHEN CONNECTING OR DISCONNECTING WIRING.

THIS DEVICE SHOULD BE INSTALLED AND SERVICED BY QUALIFIED PERSONNEL.

Installation Instructions

Slowly rotate the adjustment control in a counter-clockwise

WARNING

IN APPLICATIONS WHERE VOLTAGES IN EXCESS OF
300VAC ARE TO BE MONITORED, BE CERTAIN TO USE
THE TIME MARK MODEL 51X120 8-PIN SOCKET, OR AN
EQUIVALENT UL APPROVED 600VAC RATED SOCKET.

INSTALLATION

Mount the 8-pin socket in a suitable enclosure. A NEMA-1
rated enclosure, designed for socket-mounted relays is
available from Time Mark Corporation.

Connect 3-phase power to terminals 3, 4, and 5 on the
socket. Phase rotation should 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:

For motor control applications; use terminals 1 and 8.

For phase loss alarm applications; use terminals 1 and 2.

Insert the Model 258 into the socket and apply power. If the
contact does not transfer (green light 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 any 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 pins 1 and 8.

NOTE: When installing the Model 258 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 silicone grease, such as Dow Corning DC-4 or DC­4X. 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.

ADJUSTMENT SETTINGS

The following procedure will allow the Model 258 to be
adjusted to achieve a trip point just below the nominal phase­to-phase voltage, where the unit is applied.

Rotate the adjustment control fully clockwise, or until the red
(TRIP) indicator illuminates.

direction, just until the green (NORM) indicator illuminates.

At this point, the Model 258 is the most sensitive to irregular
power line conditions. If nuisance tripping occurs, turn the
control slightly farther counter-clockwise.

A more accurate setting will require the use of a 3-phase
variac to lower the voltage to an exact measurable setting.
Time Mark also offers a factory set version of all models and
voltage ranges, for only a small additional charge.

TROUBLESHOOTING

Should the Model 258 Monitor fail to operate properly, check
that all three voltages are present, and are of the correct
voltage level and phase rotation (a Model 108A or 108B
Phase Sequence Detector should be used to verify phase
rotation). Check all fuses and verify that all wiring connections
are correct. If problems persist, contact your local Time Mark
Distributor, or the factory for assistance (Monday-Friday, 8
a.m. to 5 p.m. CST).

MANUAL RESET VERSIONS

IF YOU DO NOT WISH TO USE A NORMALLY CLOSED
EXTERNAL RESET SWITCH ON THE MANUAL RESET
VERSION, YOU MUST JUMPER PINS 6 AND 7. Refer to
the Manual Reset 8-pin diagram.

WARRANTY

This product is warranted to be free from defects in materials
and workmanship, and is covered by our exclusive 5-year
Unconditional Warranty. Should this device fail to operate
for any reason, we will repair it for five years 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.

12/2012

© 2012 TIME MARK CORPORATION