TIME MARK CORPORATION 258 3-Phase Monitor Instructions

: June 22, 2024
: TIME MARK CORPORATION

Table of Contents

DESCRIPTION
DIMENSIONS
SPECIFICATIONS
TYPICAL APPLICATION
GENERAL SAFETY
INSTALLATION INSTRUCTIONS
Customer Support
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

TIME MARK CORPORATION 258 3-Phase Monitor

TIME MARK CORPORATION 258 3-Phase Monitor

DESCRIPTION

The Model 258 continuously monitors 3- phase 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.

DIMENSIONS

Dimensions

SPECIFICATIONS

AUTO Reset MANUAL Reset| B258B B258BM| 258B

258BM

| A258B A258BM| EX258B EX258BM| B258B-400 B258BM-400| 258B-400

258BM-400

| EX258B-415V
---|---|---|---|---|---|---|---
Nominal AC voltage (phase to phase)| 120VAC| 208/240VAC| 480VAC| 380VAC| 120VAC| 208/240VAC| 415VAC
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 Electrical: 100,000 operations at rated load
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| UL Recognized* and CSA Certified
** ***** 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 of branch circuit protection rated 10A.

TYPICAL APPLICATION

Typical Application

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

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 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.

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.

Slowly rotate the adjustment control in a counter-clockwise 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.

Installation Instructions | Installation
Instructions
---|---
Automatic Reset| Manual Reset

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.