Smaller, OEM Current Sensors and Transducers Provide Cost Effective Load Monitoring

In a properly designed system the nominal motor operating current remains in a consistent range. After the motor reaches full speed, a fast rise in current usually means a jammed impeller, jammed shaft, failed bearing, or failed drive train component. A sudden drop in current usually indicates a broken shear pin, broken drive belt, loss of suction, or blocked intake line. Current sensing is the fastest method to monitor these changes in the system.

Operation of Current Monitors and Transducers:
In equipment control applications, current sensors and monitors include trip points and a solid state or relay ouput that can disconnect the motor or sound and alarm when the monitored current exceeds the trip points. In process applications, current transducers can be used with a PLC or SCADA control system to monitor and trend actual motor current. Current transducers provide a 0 to 10 V or 4 to 20 mA output that is directly proportional to the motor's current. ABB offers AC current sensors and transducers for up to 50 A (in ranges) at 600 VAC; DC currents to 15 A. Some models include an onboard "CT" which means the monitored load voltage is completely isolated from the control circuit voltage.

Features of ABB OEM Current Monitors and Transducers:

• AC monitor and transducer models are available for up to 50A* AC
• All are single phase sensing, use one leg to sense three phase motor current
• Operations include overcurrent, undercurrent, window, go/no go, or visual indication (LED)
• Solid state or relay outputs available
• Adjustable or fixed trip point(s) and trip delay(s)
• Surface mount models offer an onboard current transformer
• DIN rail mount models offer true RMS monitoring of up to 15 A* AC; DC up to 15 A
• Fully isolated circuitry allows direct connection to a PLC input
• Popular models are In Stock for immediate shipment
• UL, CSA, CE

Applications:

• Current sensors and controls can be used to sense the operation of a remote load, up to a mile away. Current sensing positively detects the operation and running time of a monitored load without the expense of long sensor wires.
• Can be used with PLC and logic controllers to immediately sense the failure of cartridge heaters in injection molding equipment. This helps avoid expensive loss of output and downtime.
• Can sense the failure of a critical lamp in process and safety lighting applications.

* Use an external CT for higher AC currents
Some Models are 100% RoHS, Lead Free, compliant and are backed by a 10 Year Warranty. Ask your local ABB sales representative for details.

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