What is the use of elevator phase sequence relays?
The direction of rotation of the motor is directly related to the phase sequence. Therefore, in the elevator, the running direction of the elevator is also directly related to the phase sequence.
Although many of the new elevators are now mostly frequency-driven, and the frequency drive on the power phase sequence is basically no requirement; but in the earlier elevator, and even now part of the new elevator, most of the use of two-speed, etc., Some cause the power phase of the phase is not right, then the original elevator will be down the line, the original down will become up, and this is very easy to cause problems or even accidents.
Therefore, the role of phase sequence relay, is to ensure that when the power phase sequence is not correct, not to run the elevator.
In general, the phase sequence relay can also detect missing phase, three-phase voltage imbalance and other issues, and to be protected.
Check your power supply voltage and control the line wiring to see if there is no grounding and blacksmith should be phase sequence relay power circuit problems, it is recommended to use ZHRV1-08, with phase sequence, phase
The use of elevator phase sequence relays are:
1, phase sequence protection, to prevent the elevator to enhance the direction of motor running contrary to the expected, for example: is expected to ladder downstream, phase sequence error in the case of the actual uplink, in the absence of other measures to install the case,
2, phase protection, to prevent the elevator to enhance the motor in the course of running, suffered a power failure phase failure, resulting in damage to the motor or cause other accidents;
3, overvoltage, undervoltage protection, to prevent the voltage is too high, too low damage to lift the elevator and cause other accidents.
The above phase sequence relay in the elevator in a number of protective effects, including phase sequence protection, also known as reverse phase protection, fault protection, etc., generally in the external power supply repair, phase sequence error caused by the situation.
Such as the main transformer, after the end of the cable is reversed, etc .; this error, such as elevators, air compressors, central air conditioning and other end users before the electricity is unpredictable, so in this type of equipment installed phase sequence relay Is very necessary, can effectively prevent the corresponding failure of the equipment and other damage.
We are in such occasions, long-term use is ZHRV2 series, stable and reliable operation.
