Siemens AG 2007 Monitoring Relays 3UG Monitoring Relays for Electrical and Additional Measurements Line monitoring Overview Solid-state line monitoring relays provide maximum protection for mobile machines and plants or for unstable networks. Network and voltage faults can be detected early and rectified before far greater damage ensues. Depending on the version, the relays monitor phase sequence, phase failure with and without N conductor monitoring, phase unbalance, undervoltage or overvoltage. With the 3UG46 17 or 3UG46 18 relay, a wrong direction of rotation can also be corrected automatically. Function 3UG45 11 monitoring relays 3UG45 12 monitoring relays The 3UG45 11 phase sequenced relay monitors the phase The 3UG45 12 line monitoring relay monitors three-phase net- sequence in a three-phase network. No adjustments are works with regard to phase sequence, phase failure and phase required for operation. The device has an internal power supply unbalance of 10 %. Thanks to a special measuring method, a and works using the closed-circuit principle. If the phase phase failure is reliably detected in spite of the wide voltage sequence at the terminals L1-L2-L3 is correct, the output relay range from 160 to 690 V AC and feedback through the load of up picks up after the delay time has elapsed and the LED is lit. If the to 90 %. The device has an internal power supply and works using phase sequence is wrong, the output relay remains in its rest the closed-circuit principle. No adjustments are required. When position. the mains voltage is switched on, the green LED is lit. If the phase sequence at the terminals L1-L2-L3 is correct, the output relay Note: picks up. If the phase sequence is wrong, the red LED flashes and When one phase fails, connected loads (motor windings, lamps, the output relay remains in its rest position. If a phase fails, the red transformers, coils, etc.) create a feedback voltage at the LED is permanently lit and the output relay drops. terminal of the failed phase due to the network coupling. Because the 3UG45 11 relays are not resistant to voltage Note: feedback, such a phase failure is not detected. Should this be The red LED is a fault diagnostic indicator and does not show the required, then the 3UG45 12 monitoring relay must be used. current relay status. The 3UG45 12 monitoring relay is suitable for line frequencies of 50/60 Hz. Correct phase sequence Phase failure L1-L2-L3 L2-L3 L1-L2-L3 L1-L2-L3 11/14 11/14 11/12 ON 11/12 21/24 21/24 21/22 21/22 LED rd OFF ON OFF Phase loss Wrong phase sequence Wrong phase sequence L3-L2-L1 11/14 L3-L2-L1 11/12 11/14 11/12 OFF 21/24 21/22 21/24 LED rd 21/22 OFF FLASH OFF Phase sequence Siemens LV 1 T 2007 7/61 NSB0 01566 NSB0 01565 NSB0 01568 NSB0 01567 7 Siemens AG 2007 Monitoring Relays 3UG Monitoring Relays for Electrical and Additional Measurements Line monitoring 3UG45 13 monitoring relays 3UG46 14 monitoring relays The 3UG45 13 line monitoring relay monitors three-phase net- The 3UG46 14 line monitoring relay has a wide voltage range works with regard to phase sequence, phase failure, phase un- and an internal power supply. The device is equipped with a dis- balance of 20 % and undervoltage. The device has an internal play and is parameterized using three buttons. It monitors three- power supply and works using the closed-circuit principle. The phase networks with regard to phase unbalance from 5 to 20 %, hysteresis is 5 %. The integrated response delay time is adjust- phase failure, undervoltage and phase sequence. The hystere- able from 0 to 20 s and responds to undervoltage. If the direction sis is adjustable from 1 to 20 V. In addition the device has is incorrect, the device switches off immediately. Thanks to a a response delay and ON-delay from 0 to 20 s in each case. special measuring method, a phase failure is reliably detected The integrated response delay time responds to phase unbal- in spite of the wide voltage range from 160 to 690 V AC and ance and undervoltage. If the direction is incorrect, the device feedback through the load of up to 80 %. When the mains volt- switches off immediately. Thanks to a special measuring age is switched on, the green LED is lit. If the phase sequence method, a phase failure is reliably detected in spite of the wide at the terminals L1-L2-L3 is correct, the output relay picks up. voltage range from 160 to 690 V AC and feedback up to 80 % If the phase sequence is wrong, the red LED flashes and the out- through the load. put relay remains in its rest position. If a phase fails, the red LED The 3UG46 14 monitoring relay can be operated on the basis of is permanently lit and the output relay drops. either the open-circuit or closed-circuit principle and with Note: manual or auto RESET. The red LED is a fault diagnostic indicator and does not show the current relay status. The 3UG45 13 monitoring relay is suitable for line frequencies of 50/60 Hz. With the closed-circuit principle selected Wrong phase sequence Phase failure and undervoltage L3-L2-L1 L1-L2-L3 L2-L3 L1-L2-L3 Hysteresis 11/14 -20% 5% 11/12 3~U n 21/24 11/14 21/22 11/12 Phase failure 21/24 21/22 NSB0 01569 LED rd L1-L2-L3 L2-L3 L1-L2-L3 OFF ON OFF ON OFF Phase loss Delay 11/14 11/12 Wrong phase sequence 21/24 21/22 L3-L2-L1 Undervoltage 11/14 11/12 < Hysteresis x-y 21/24 21/22 11/14 LED rd 11/12 OFF FLASH OFF 21/24 Phase sequence 21/22 Delay onDelay Unbalance Hysteresis > Asy 2% 0% 11/14 11/12 21/24 21/22 Delay onDelay Siemens LV 1 T 2007 7/62 7 NSB0 01570 NSB0 01571 NSB0 01576 NSB0 01578 NSB0 01577