Cutler Hammer, Div of Eaton Corp ECSTD Series Installation Instructions

P51921 Rev 02

Installation Instructions

CurrentWatch™ ECSTD Series AC Current Switches with Time Delay

INSTALLATION

Considerations for all ECSTD Series models…

WARNING

IN ORDER TO AVOID ELECTRIC SHOCK OR OTHER POSSIBLE INJURY:

• DO NOT USE THIS PRODUCT FOR HUMAN SAFETY APPLICATIONS.
IT WAS NOT DESIGNED, TESTED OR RECOMMENDED FOR THIS
USE.

• DO NOT USE THIS PRODUCT IN HAZARDOUS LOCATIONS (E.G.
EXPLOSIVE ATMOSPHERES). IT WAS NOT DESIGNED, TESTED OR
RECOMMENDED FOR THIS USE.

• ENSURE THE PRODUCT IS PROPERLY WIRED FOR THE
APPLICATION. REFER TO THE SPECIFICATIONS AND WIRING
DIAGRAMS IN THIS MANUAL.

MODELS COVERED IN THIS MANUAL

Catalog Number Description

ECSTD401SC AC, Solid Core, N.O., 1.5-12, 12-55 or 50-175A Setpoints

ECSTD402SC AC, Solid Core, N.C., 1.5-12, 12-55 or 50-175A Setpoints

ECSTD404SP AC, Split Core, N.O., 2-12, 12-55 or 50-200A Setpoints

ECSTD405SP AC, Split Core, N.C., 2-12, 12-55 or 50-200A Setpoints

ECSTD406SC AC/DC, Solid Core, N.O., 1.5-12, 12-55 or 50-175A Setpoints

ECSTD407SC AC/DC, Solid Core, N.C., 1.5-12, 12-55 or 50-175A Setpoints

ECSTD408SP AC/DC, Split Core, N.O., 2-12, 12-55 or 50-200A Setpoints

ECSTD409SP AC/DC, Split Core, N.C., 2-12, 12-55 or 50-200A Setpoints

• Run wire to be monitored through the aperture (opening) in the
switch body

• These switches can be located in the same environment as
motors, contactors, heaters, pull-boxes and other electrical
enclosures

• Mounting can be done in any position or hung directly on a wire
with a wire tie

• Be sure to leave at least one inch distance between sensor and
other magnetic devices

Considerations for split-core models only…

• Press the tab in the direction shown below to open the sensor.

• After placing the wire in the aperture, press the hinged portion
fi rmly downward until a click is heard and the tab pops out fully.

• Keep split-core contact areas clean. Silicon grease is factory
applied on the mating surfaces to prevent rust and improve
performance. Be careful not to allow grit or dirt into the grease in
the contact area, particularly on core mating surfaces of split core
models. Sensor operation could be impaired if mating surfaces do
not have good contact. Check visually before closing.

Important:

Keep contact areas clean

394000109

To open:

Press tab inward
towards hinge

INTRODUCTION

The CurrentWatch™ ECSTD
Series are a family of high
performance current-operated
switches with fi eld-adjustable
time delay to help minimize
nuisance trips during start-up
and operation. Designed for
motor status applications where
setpoint accuracy and repeatability are critical, the ECSTD Series offers
a linear setpoint characteristic and constant hysteresis.

Standard features include self-powering, jumper-selectable ranges and
a choice of outputs and housing styles cases. Models are available
which provide N.O. or N.C. AC contacts or solid-state N.O. or N.C.
“universal” contact outputs which can switch AC or DC. Contact action
can be delayed for up to 15 seconds by using the Time Delay Adjust
potentiometer.

Eaton’s current sensor family encompasses a broad range of products
for cost-effective monitoring, status, and predictive maintenance.
Downtime and costly repairs can be avoided by utilizing Eaton’s
products and technologies in your control systems.

Effective: June 2007 Page 1

Questions? Call our Sensor Application Engineers at [phone].

QUICK INSTALL GUIDE

The below steps can be followed to quickly install a CurrentWatch™
ECSTD Series switch.

1. Run the wire to be monitored through the aperture

2. Mount the sensor

3. Connect output wiring
a. Use up to 14 AWG copper wires
b. Ensure load matches the output shown on the switch label

4. Adjust the setpoint
a. Choose correct range by positioning the range jumper

(removed for low, across two appropriate pins for medium, or
high)

b. Use the potentiometer to adjust the setpoint

P51921 Rev 02

394000109

SETPOINT ADJUSTMENT

The CurrentWatch™ ECSTD Series setpoint and time delay are adjusted
through two four-turn pots (on split-core models) and 15-turn pots (on
solid-core models). The unit comes from the factory with setpoint and
time delay set to the lowest level (fully counter-clockwise). Turning the
pots clockwise will increase their value. All pots have a slip-clutch to
prevent damage at either end of their rotation. To determine where the
adjustment is, turn the pot all the way counter-clockwise. This will return
it to the minimum setpoint.

Important Setpoint Adjustment Notes

• Output contacts are solid-state. Check output status by applying
the appropriate voltage to the contacts and reading the voltage
drop across the contacts. An Ohmmeter set on “continuity” will
give misleading results.

• It is recommended the setpoint be adjusted to allow for the usual
utility company voltage variations of 10 to 15 percent.

Typical Adjustment Steps

1. Identify expected Input Range and position jumper accordingly.
For LOW range, remove jumper entirely. For MID or HIGH range,
place jumper over proper two pins.

2. Turn the setpoint pot to the minimum value (four turns for split-core
models and fi fteen turns for solid-core models).

3. Have normal operating current running through the switch. The
output should be tripped because the pot is at its minimum
setpoint. For units with LED, it should be fl ashing fast (two to three
times per second).

4. Turn the pot clockwise until the unit un-trips. This is indicated by
the slow fl ashing of the LED (once every two to three seconds), or
by the changing of the output switch status.

5. Now turn the pot counter-clockwise slowly until the unit trips again.

a. To set underload, turn the pot about 1/8 turn further counter-

clockwise

b. To set overload, turn the pot about 1/8 turn further clockwise

6. Adjust the time delay of the contact action in the same fashion.
Increase time delay by turning the pot clockwise. For split-core
models, each quarter-turn corresponds roughly to one second of
delay time. Expect ten turns for a 15 second delay.

LED INDICATION / OUTPUT STATUS

Output

Monitored Amps

None or Minimum Open Closed Off

Below Trip Level Open Closed Slow (2 sec.)

Above Trip Level Closed Open Fast (0.5 sec.)

Smart-LED
(If Present)N.O. N.C.

WIRING DIAGRAM

Connect control or monitoring wires to the sensor. Use up to 14 AWG
copper wire and tighten terminals to 5 inch-pounds torque. Be sure the
output load does not
exceed the solid state
output rating.

CAUTION! Incandescent
lamps can have “cold
fi lament inrush” current of
up to ten times their rated
amperage. Use caution
when switching lamps.

AC or DC

Power

Output Signal

AC or DC

Load

Use caution when

To Monitored Load

switching lamps

RANGES AND MAXIMUM AMPS

Maximum Amps

Housing Range

Solid Core 1.5-175A 150A 400A 1,000A

Split Core 2-200A 150A 400A 1,000A

Continuous 6 sec. 1 sec.

HYSTERESIS

Setting Hysteresis

Low <

Mid <

High <

SWITCHING DELAY

Delay Type Low Range Mid Range High Range

On Delay 0.23 sec. max. 0.05 sec. max. 0.03 sec. max.

Off Delay 0.02 sec. max. 0.02 sec. max. 0.01 sec. max.

TROUBLESHOOTING

Problem Solution

Switch is
always tripped

Switch will
not trip

The setpoint may be too low. Turn pot clock-wise to increase setpoint.

Switch may have been overloaded and contacts are burned out. Check the
output load, remembering to include inrush on inductive loads (coils, motors).

The setpoint may be too high. Turn pot counter-clockwise to decrease
setpoint.

For split core models, the core contact area may be dirty. Open the sensor
and clean the contact area.

The monitored current may be below the minimum required. Loop the
monitored wire several times through the aperture until the “sensed” current
rises above the minimum. The sensed amps equals “actual amps” multiplied
by the “number of loops.” Count loops on the inside of the aperture.

Switch may have been overloaded and contacts are burned out. Check the
output load, remembering to include inrush on inductive loads (coils, motors).

SPECIFICATIONS

Specifi cation Value

Power Supply Self Powered–No Power Supply Needed

Output Magnetically Isolated Solid State Switch

Output Rating AC-Only Models: N.O./N.C. 1A @ 240V AC

Off-State Leakage ECSTD402SC and ECSTD405SP Models: 2.5 mA

Response Time Adjustable, 0.12 to 15 seconds

Setpoint Range Solid Core Models: 1.5-12, 12-55 and 50-175A

Setpoint Adjustment Solid Core Models: 15-Turn Potentiometer

Hysteresis Constant 5% of Setpoint

Overload See “Ranges and Maximum Amps” in Above Table

Isolation Voltage UL Listed to 1,270V AC, Tested to 5,000V AC

Frequency Range 50-100Hz

Sensing Aperture Solid Core Models: 0.75 in. (19mm) dia.

Housing UL94 V0 Flammability Rated

Environmental Operating Temperature: -58 to +149° F (-50 to +65° C)

Approvals UL and ULC Listed (Pending)

AC/DC Models:
N.O. 0.15A @ 240V AC/DC
N.C. 0.20A @ 135V AC/DC

All Other Models: Negligible

Split Core Models: 2-12, 12-55 and 50-200A

Split Core Models: 4-Turn Potentiometer

Split Core Models: 0.85 in. (21.7mm) sq.

Humidity: 0-95% RH, Non-Condensing

CE Certifi ed (Pending)

0.01A

0.1A

0.5A

Effective: June 2007 Page 2

Questions? Call our Sensor Application Engineers at [phone].