DESCRIPTION
The Model 258 continuously monitors 3-phase power
lines for abnormal conditions. When properly ad-
justed, 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 electro-
mechanical 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.
TYPICAL APPLICATION
SPECIFICATIONS
AUTO Reset
MANUAL Reset
B258B
B258BM
258B
258BM
A258B
A258BM
EX258B
EX258BM
B258B-400
B258BM-400
258B-400
258BM-400
Nominal AC voltage
(phase to phase)
120 vac 208/240 vac 480 vac 380 vac 120 vac 208/240 vac
Case Color Gray Red Yellow Yellow Gray Red
Adjustment range 85-120 vac 160-240 vac 380-480 vac 300-400 vac 85-120 vac 160-240 vac
Frequency 60 Hz 60 Hz 60 Hz 50 Hz 400 Hz 400 Hz
Pwr consumption
0.75W 1.5W 4.5W 3.75W 0.75W 1.5W
Transient protection 2500 VAC for 10 ms
Repeat accuracy ± 0.1% of set point (fixed conditions)
Response time 50 msec (set or reset)
Dead band Approx. 2%
Output contacts SPDT 10 amps at 240 VAC resistive
Expected relay life Mechanical: 10 million operations
Electrical: 100,000 operations at rated load
Operating temp. -40° to +131° F
Humidity tolerance 0 - 97% w/o condensation
Enclosure material Dust cover: ABS plastic
Mounting 8-pin socket ( **sold separately)
Weight 5 oz.
Agency approvals UL Recognized* and CSA Certified
*condition of acceptability: the 380V and 480V versions
must be used with a UL Recognized 600 VAC socket
** Order 8-pin socket number 51X120
DIMENSIONS
ll Detects phase loss, low voltage, phase reversal
ll 50 Hz, 60 Hz and 400 Hz models
ll Automatic or manual reset
ll Five year unconditional warranty
MODEL 258
3-Phase Monitor
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. 87A123 12/00
© 2000 TIME MARK CORPORATION
11440 East Pine Street
Tulsa, Oklahoma 74116
To Next Page
Loading...