Larson Electronics EXP-EL-CSS-250A-R1-NO User manual

EXP-EL-CSS-250A-R1-NO
Larson Electronics, LLC Phone: [phone] Fax: [phone] www.larsonelectronics.com
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Explosion Proof AC Current Sensing Switch
240V AC/DC Output - 0-250A Sensing Range - NO Contacts
Instruction Manual
Thank you for your purchase of the Larson Electronics EXP-EL-CSS-250A-R1-NO.
WARNING:
READ CAREFULLY BEFORE INSTALLING FIXTURE. RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE.
CRITICAL SAFETY INSTRUCTIONS:
•INSTALLATION SHOULD ONLY BECONDUCTED BY A QUALIFIED ELECTRICIAN IN ACCORDANCE WITH NEC AND ANY
RELEVANT LOCAL BUILDING CODES.
•RISK OFFIRE OR ELECTRIC SHOCK. FIXTURE INSTALLATION REQUIRES KNOWLEDGE OF FIXTURE'S ELECTRICAL
SYSTEMS. IFNOTQUALIFIED, CONTACT A QUALIFIED ELECTRICIAN.
•BE CERTAIN ELECTRICAL POWER IS OFF BEFORE AND DURING INSTALLATION AND MAINTENANCE.
•MAKE SURE THE SUPPLY VOLTAGE IS THE SAME AS THE FIXTURE'S RATED VOLTAGE.
•TO PREVENT WIRING DAMAGE OR ABRASION, DO NOT EXPOSE WIRING TO EDGES OF SHEET METAL OR SHARP
OBJECTS. SUITABLE FOR DAMP LOCATIONS.
IMPORTANT
READ CAREFULLY BEFORE INSTALLING THIS FIXTURE. SAVE THESE INSTRUCTIONS FOR FUTURE
REFERENCE. THE EXP-EL-CSS-250A-R1-NO MUST BE WIRED IN ACCORDANCE WITH NATIONAL
ELECTRICAL CODE AND ALL APPLICABLE LOCAL CODES. PROPER GROUNDING IS REQUIRED FOR SAFETY.
WE STRONGLY ENCOURAGE ONLY ALICENSED ELECTRICIAN INSTALL, OPERATE AND MAINTAIN THIS
PRODUCT. IF YOU ARE NOT QUALIFIED OR UNFAMILIAR WITH ANY ASPECT OF THIS INSTRUCTION SHEET,
CONSULT AN ELECTRICIAN. THERE ARE NO SERVICEABLE PARTS INSIDE.
WARNING: MAKE SURE POWER IS TURNED OFF BEFORE STARTING THE
INSTALLATION OR PERFORMING ANY MAINTENANCE.
RISK OF FIRE/ELECTRIC SHOCK –DISCONNECT POWER AT BREAKER BEFORE INSTALLING OR SERVICING.
RISK OF PERSONAL INJURY –FIXTURE MAY BECOME UNSTABLE OR DAMAGED IF NOTINSTALLED PROPERLY.
RISK OF BURN –ALLOW FIXTURE TO COOL BEFORE SERVICING.
WARNING
TO AVOIDTHE RISKOF FIRE,EXPLOSION OR ELECTRIC SHOCK, THIS PRODUCT SHOULD BE INSTALLED,
INSPECTEDAND MAINTAINEDBY A QUALIFIED ELECTRICIANONLY, IN ACCORDANCEWITHALL
APPLICABLEELECTRICAL CODES.
TO AVOIDELECTRIC SHOCK:
•BE CERTAIN ELECTRICAL POWER IS OFF BEFORE AND DURING INSTALLATION AND MAINTENANCE.
•PRODUCT MUST BE CONNECTED TO A WIRING SYSTEM WITH AN EQUIPMENT-GROUNDING
CONDUCTOR.
TO AVOID EXPLOSION:
•MAKE SURE THE SUPPLY VOLTAGE IS WITHIN THE VOLTAGE RATING.
•ENSURE THE MARKED T RATING IS LESS THAN THE IGNITION TEMPERATURE OF THE HAZARDOUS
ATMOSPHERE.
•DO NOT OPERATE IN AMBIENT TEMPERATURES ABOVE THOSE INDICATED ON THE PRODUCT
NAMEPLATE.
•DO NOT OPERATE IF THE LENS, CORD, SEALS, HOUSING, RECEPTACLES, ETC. IS CRACKED OR
DAMAGED. IF SO, DISCONTINUE USE AND CONTACT MANUFACTURER FOR REPLACEMENT PARTS.
•ALL FASTENERS SHOULD BE PROPERLY SEATED.
The EXP-EL-CSS-250A-R1-NO from Larson Electronics is an Explosion Proof AC Current Switch designed for power
monitoring and circuit control in Class I, II and III rated facilities. The solid-state switch is equipped with a fixed core, non-
adjustable trip point and normally open contacts. This explosion proof device offers a current sensing range of 0-250A.

EXP-EL-CSS-250A-R1-NO
Larson Electronics, LLC Phone: [phone] Fax: [phone] www.larsonelectronics.com
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WIRING
We strongly encourage a licensed electrician install this product,in all locations especially in outdoor areas
where weatherproofing may be required. Universal voltage driver permits operation at 240V AC/DC.
Warning: Check product label for correct input voltage!
INSTALLATION
1. Run the wire to be monitored through aperture.
2. Mount the sensor.
3. Connect output wiring.
a. Use 22AWG (0.33mm²) up to 14AWG (2.5mm²) copper wires, 75/90°C insulation.
b. Ensure load matches the output shown on the sensor label.
For All Versions
Run wire to be monitored through the aperture (opening) in the sensor.
The AC Current Switch 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 wires with a wire tie. Ensure at least one
inch clearance exists between sensor and other magnetic devices.
Split-Core Versions (-S Suffix)
Press the tab in the direction as shown to open the sensor. After placing wire in
aperture, press the hinged portion firmly downward until a click is heard and the tab
pops out fully.
Important!
Keep Contact
Area CLEAN!
To Open
Press Tab
Toward Hinge.
KEEP SPLIT-CORE SENSORS CLEAN.
Silicone grease is factory applied on the mating surfaces to prevent rust and improve performance. Be careful not to allow grit or dirt
onto the grease in the contact area. Operation can be impaired if the mating surfaces do not have good contact. Check visually
before closing.
Output Wiring
Connect control or monitoring wires to the sensor. Use 22AWG (0.33mm²) up to
14AWG (2.5mm²) copper wire and tighten terminals to 5 in lbs (0.6 Nm) torque. Be
sure the output load does not exceed the switch rating.
CAUTION: INCANDESCENT LAMPS CAN HAVE “COLD
FILAMENT INRUSH” CURRENT OF UP TO 10 TIMES THEIR
RATED AMPERAGE. USE CAUTION WHEN
SWITCHING LAMPS ON AND OFF.
The output connection is simple, and is not polarity sensitive. Bring the control
circuit voltage to one terminal, and connect the controlled load to the other. When
closed, the contact will pass the control circuit voltage from the source to the load.
AC Current Switch
Setpoint Adjustment
The AC Current Switch setpoint is fixed and non-adjustable:
1. Output contacts are solid-state. Check output status by applying voltage to the contacts and reading the voltage drop across the contacts.
An ohmmeter set on “Continuity” will give misleading results.
Monitored Amps Output
Fixed Split N.O.
Below 0.75 A 1.25 A OPEN
Above 0.75 A 1.25 A CLOSED

EXP-EL-CSS-250A-R1-NO
Larson Electronics, LLC Phone: [phone] Fax: [phone] www.larsonelectronics.com
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USE AND CARE
Unauthorized modification may impair the function and/or safety of this device and could affect the life of the equipment.
Always check for damaged or worn out parts before using the device. Store it in a secure place out of the reach of
children when not in use. Inspect for good working condition prior to storage and before re-use.
REPLACEMENT PARTS
The EXP-EL-CSS-250A-R1-NO is designed to provide years of reliable performance. Should the need for replacement
parts arise, please contact Larson Electronics.
THESE INSTRUCTIONS MAY NOT COVER ALL DETAILS OR VARIATIONS OF THIS PRODUCT FOR YOUR EQUIPMENT OR INSTALLATION
REQUIREMENTS. SHOULD FURTHER INFORMATION NOT COVERED BY THESE INSTRUCTIONS BE REQUIRED, PLEASE CONTACT LARSON
ELECTRONICS BY EMAIL AT SA[email protected] OR BY PHONE AT 1-800-369-6671 FOR FURTHER ASSISTANCE.
PLEASE VISIT LARSONELECTRONICS.COM FOR WARRANTY AND RETURN INFORMATION.
TROUBLESHOOTING
1. Sensor is always tripped
A. Switch has been overloaded and contacts are burned out.
Check the output load, remembering to include inrush or inductive loads (coils, motors, ballasts).
B. The setpoint may be too low.
Verify monitored circuit amps are less than the fixed setpoint of the AC Current Switch.
2. Sensor will not trip
A. The setpoint may be too high.
Verify monitored circuit amps are greater than the fixed setpoint of the AC Current Switch.
B. Split Core models: The core contact area may be dirty. Open the sensor and clean the contact area.
C. Monitored current is below fixed setpoint.
Loop the monitored wire several times through the aperature until the “sensed” current rises above min-imum. Sensed
Amps = (Actual Amps) x (Number of Loops). Count loops on the Inside of the aperature.
D. Switch has been overloaded and contacts are burned out.
Check the output load, remembering to include inrush on inductive loads (coils, motors, ballasts).
MAINTENANCE
There are no serviceable parts inside the fixture. However, it is good practice to routinely clean and check the
fixture for proper function.