Three-phase relays help reduce downtime and equipment damage by monitoring and alerting on issues that can occur with the power supply for a motor or other industrial machinery. Issues such as phase loss, reversal and under/over voltage can contribute to premature motor or equipment failure or downtime. These relays detect and react to these conditions, preventing them from occurring in the first place. They can be used in applications such as in a control center or for critical motor and pump monitoring in industrial settings.
The SLA family of universal phase monitors offer cost-effective protection against common power system problems that contribute to motor or equipment failure, downtime, and increased operating costs. They provide protection against phases missing, over/under voltage, and reversal for both Delta and Wye systems. The monitors have high-sensitivity, allowing them to detect a phase loss condition even when regenerative loads cause minimal measurable voltage reduction between phases. They can be connected to a contactor or directly to the motor, and they have dual normally open (NO) output contacts that close when an alarm condition is detected.
These three-phase relays have a wide operating voltage range that allows them to be used in a variety of applications. They are available with either plug-in or panel mount housings and include status LEDs to indicate power on and relay activation. They are suitable for use in a variety of industries such as automotive, food processing, HVAC and refrigeration.
Carlo Gavazzi's DPC01CM69 three-phase relay has a wide range of features that allow it to be used in a number of different types of applications. It has a dip switch selection for the operating voltage, which is selectable between 230V and 400V AC. It also has a dip switch to set the phase sequence or loss alarm threshold, and the relay output can be configured as either a pair of double-pole, double-throw (DPDT) or a single set of SPDT contacts. It also offers a selection for the power on delay (1 s or 6 s) and a feature to monitor asymmetry, tolerance and amplitude.
When an alarm event occurs, the relay can be de-energized after a preset time, and the alarm is indicated by a yellow LED turning off and a red LED flashing. This can be a good indication that a power problem is occurring and that the equipment needs to be checked.
The DPC01CM69 is designed to be mounted on a 35 mm DIN rail and comes with complete documentation that makes it easy to install and maintain. It is fully protected against short-term voltage dips and carries a manufacturer warranty.
These three-phase relays from Siemens are ideal for a number of applications, including in pumps, fans and blowers, electric motors, air compressors, elevators and cranes. They monitor for a variety of errors, including loss of phase, phase sequence and unbalance, overvoltage, undervoltage and asymmetry. The relays can be triggered by either an auxiliary input or external voltmeter and have two auxiliary contacts that can be switched from normally open to normally closed.
