NATIONAL CONTROLS IST-200T User Manual

5-6

UNDER

OVER

L1

L2

COM

NO

NC

min.

max.

max.

min.

POINT

TRIP

FAULT

CURRENT

CURRENT

MODE SELECT SWITCH

NON-

LATCH

LATCH

AC CURRENT SENSOR

TRIP

DELAY

MOTOR

ALARM

Motor

Supply

Voltage

120 or 240 VAC

Input Voltage

SETTINGS:

TRIP POINT: approx. 10 amps
TRIP DELAY: approx. 4.5 sec.

MODE SELECT SWITCH:

Non-Latching
Over-Current

CURRENT MONITORS

2-20 A Current Monitor

IST-200T Series

FEATURES

100% functionally tested

●

Low cost

●

Fault status LED

●

Adjustable trip delay timer

●

Adjustable trip point from 2 to 20 A

●

●

Selectable ouput modes:
– Latching
– Non-latching

Selectable sensing modes:

●

– Over-current
– Under-current

120 VAC and 240 VAC models

●

50/60 Hz operation

●

SPDT 10 A relay output

●

●

Epoxy encapsulated

●

File #E59090

through the torroid transformer; two
turns would change the range to 1 to
10 A, four turns would change it to 0.5 to
5 A.

TYPICAL APPLICATION

As long as the operating current of the
motor is less than 10 A, the alarm will not
sound. If the motor draws greater than 10 A
for longer than 4.5 seconds, the FAULT LED
will light and the alarm will sound. Because
the NON-LATCH mode is set, the fault con
dition will clear as soon as the current draw
of the motor drops below 10 A. When the
fault is cleared, the FAULT LED will turn off
and the alarm will stop sounding. If, how

­ever, the LATCH mode was selected and
an OVER-CURRENT fault is detected, the
fault will not clear when the motor current

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draw dropped below 10 A. In this case, the

Operating Logic: The Current Monitor
senses AC load current passing through its
torroid transformer. In the OVER-CURRENT
mode, the on-board relay will initiate the

alarm would continue to sound until reset of
the Current Sensor by either removing and
reapplying power or by switching to NON­LATCH mode.

TRIP DELAY timer and illuminate the FAULT
LED when the sensed current is greater
than the TRIP POINT setting. If the sensed
current is still greater than the TRIP POINT
setting after the TRIP DELAY timer has
elapsed, the on-board relay will energize.
If the UNDER-CURRENT mode is select

­ed, the on-board relay will be un-energized
as long as the sensed current is greater
than the TRIP POINT setting. Once the
sensed current drops below the TRIP POINT
setting, the TRIP DELAY timer will start tim

­ing and the FAULT LED will illuminate. If the
sensed current is still less than the TRIP
POINT setting after the TRIP DELAY time
has elapsed, the on-board relay will ener
gize and its contacts will change state.
The Current Monitor will automatically

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reset itself when the sensed current returns
to its non-fault value if the NON-LATCH
mode is selected. However, if the LATCH
mode is selected, the on-board relay will
remain energized regardless of any sub
sequent change in the sensed current. To
reset the fault in this mode, either remove
input power from unit and reapply it, or
switch to NON-LATCH mode.
The Current Monitor is designed to sense
a range of 2 to 20 A with a single loop of the
load wire passed through the torroid trans

-

­former. Greater sensitivity can be achieved
by passing multiple loops of the load wire

AMETEK National Controls Corp. • 1725 Western Drive • West Chicago, Illinois 60185 • Tel: [phone] • 630-231-5900 • FAX: [phone] • www.nationalcontrols.com

SPECIFICATIONS

TERMINALS ARE

QUICK CONNECT (5

)

.25 X .032

MOUTING HOLES (2)

.188 DIA.

.375 DIA.

.50 [12.7]

1.94

.28

2.94

.28

1.375
MAX.

3.50

2.50

R

Corporation

National Controls

West Chicago, IL. 60185

UNDER

OVER

L1

L2

COM

NO

NC

min.

MADE IN THE U.S.A .

max.

max.

min.

POINT

TRIP

FAULT

CURRENT

CURRENT

MODE SELECT SWITCH

NON-

LATCH

LATCH

AC CURRENT SENSOR

CONTACT RATING: 10A, 250VAC

TRIP

DELAY

Model: IST-200T*-14* INPUT:***VAC
Range: 2-20 AMPS, .*-** seconds

INPUT

Operating Voltage:

IST-200TA-141: 105 to 135 VAC, 50/60 Hz
IST-200TA-145: 210 to 270 VAC, 50/60 Hz

Power Consumption: 3.5 VA max.
Current Sense Input: 0 to 40 A steady-state

200 A inrush for 100 ms max.

OUTPUT

Type: Relay contacts SPST (1 form C)
Rating: 10 A resistive, 1/2 hp at 250 VAC
Life:

Mechanical: 1,000,000 operations
Electrical: 100,000 operations at full load

CURRENT SENSE ADJUSTMENT

Range: 2 to 20 A with single load wire through

sensor, Trimpot adjustable

Power-up surge delay: 100 ms max.
Response time: 100 ms max. over or under cur

rent mode

CURRENT TRIP DELAY ADJUSTMENT

Range: 0.1 to 10 sec., Trimpot adjustable

MECHANICAL

Termination: 5 - .25” x .032” male fast-on

terminals
Mounting: 3.5” x 2.5” encapsulated enclosure

with 2 mounting holes suitable for #8 screw

ENVIRONMENTAL

Storage Temperature: -40°C to +85°C
Operating Temperature: -40°C to +65°C

CURRENT MONITORS

5-7

-

ORDERING INFORMATION

AMETEK National Controls Corp. • 1725 Western Drive • West Chicago, Illinois 60185 • Tel: [phone] • 630-231-5900 • FAX: [phone] • www.nationalcontrols.com

INPUT VOLTAGE TRIP POINT TRIP DELAY PART NUMBER

120 VAC 2 to 20 A .1 to 10 sec. IST-200TA-141

240 VAC 2 to 20 A .1 to 10 sec. IST-200TA-145