Phase Failure Three Phase Voltage Monitoring Relay Plug - In Mounting APR-3

Phase Failure Three Phase Voltage Monitoring Relay Plug-In Mounting APR-3

The circuit of the motor phase failure protection device has six external terminals, where N is the neutral line of the power supply, A, B, and C are the phase A and B phases of the main circuit, and the two terminals IN and OUT are connected and controlled. Loop power supply in series. The inside of each external terminal is an inherent part and must correspond to each other. At the same time, the distance between the column and the column should be as large as possible to prevent short-circuiting between the connected columns. Therefore, these intrinsic components must be carefully connected, and if they are wrong, they may burn out the protection device.

The purpose of phase protection
In the operation of the three-phase motor, as long as one of the following conditions, such as contactor contacts burned and caused a phase contact failure, installation and maintenance causes a phase disconnected or three-phase power supply fuse of a phase fuse, will Causes the three-phase motor to run in phase. If it is found that it is not timely, it will also cause the burning of the motor and the damage of the equipment, which will affect the continuous production and cause some losses.
In order to ensure the safe operation of the motor, generally important motors are equipped with various phase failure protection devices to prevent the motor from being burned out in the event of a phase loss and to minimize unnecessary losses.

Voltage-based phase failure protection. The principle is to detect the absence of phase by detecting the supply voltage. In general, this kind of product often has a phase sequence protection function, which is called “voltage phase sequence relay”. The advantage is that it is easy to use. A "phase sequence relay" can protect multiple motors. The disadvantage is that it can only protect the power supply from the lack of phase. It can not protect the motor phase caused by poor contact of the AC contactor. In addition, for the dynamic phase loss (ie, the phase loss that occurs after the motor runs), the phase of the de-energized voltage is not zero due to the power generation of the motor, and is usually only slightly lower than the normal phase voltage. Higher false positive rate

Features: Three-phase monitoring of phase sequence, phase loss ,Powered by the measuring circuit, 1 C/O contact, LEDs for status indication

There have two Protective Functions Phase sequence, Phase loss

Typical Applications• Pumps • Fans• Blowers • Motors• Compressors

Approvals is CE • CCC

♦ Technical data