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. Net- work and voltage faults can be detected early and rectified be- fore 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. Phase unbalance is evaluated as the difference between the greatest and the smallest phase voltage relative to the greatest phase voltage. Undervoltage or overvoltage exists when at least one phase voltage deviates by 20 % from the set rated system voltage or the directly set limit values are overshot or undershot. The rms value of the voltage is measured. With the 3UG46 17 or 3UG46 18 relay, a wrong direction of rota- tion can also be corrected automatically. Function 3UG45 11 monitoring relays 3UG45 12 monitoring relays The 3UG45 11 phase sequenced relay monitors the phase se- The 3UG45 12 line monitoring relay monitors three-phase net- quence in a three-phase network. No adjustments are required works with regard to phase sequence, phase failure and phase for operation. The device has an internal power supply and unbalance of 10 %. Thanks to a special measuring method, a works using the closed-circuit principle. If the phase sequence phase failure is reliably detected in spite of the wide voltage at the terminals L1-L2-L3 is correct, the output relay picks up af- range from 160 ... 690 V AC and feedback through the load of up ter the delay time has elapsed and the LED is lit. If the phase se- to 90 %. The device has an internal power supply and works us- quence is wrong, the output relay remains in its rest position. ing the closed-circuit principle. No adjustments are required. When the mains voltage is switched on, the green LED is lit. If the Note: When one phase fails, connected loads (motor windings, phase sequence at the terminals L1-L2-L3 is correct, the output lamps, transformers, coils, etc.) create a feedback voltage at the relay picks up. If the phase sequence is wrong, the red LED terminal of the failed phase due to the network coupling. Be- flashes and the output relay remains in its rest position. If a phase cause the 3UG45 11 relays are not resistant to voltage feedback, fails, the red LED is permanently lit and the output relay drops. such a phase failure is not detected. Should this be required, then the 3UG45 12 monitoring relay must be used. Note: The red LED is a fault diagnostic indicator and does not show the current relay status. The 3UG45 12 monitoring relay is suitable for line frequencies of 50/60 Hz. Phase failure Correct phase sequence L1-L2-L3 L2-L3 L1-L2-L3 L1-L2-L3 11/14 11/14 ON 11/12 11/12 21/24 21/24 21/22 21/22 LED rd OFF ON OFF Wrong phase sequence Phase loss Wrong phase sequence L3-L2-L1 L3-L2-L1 11/14 11/14 11/12 11/12 OFF 21/24 21/24 21/22 21/22 LED rd OFF FLASH OFF Phase sequence Siemens 2010 59 NSB0 01566a NSB0 01565a NSB0 01568a NSB0 01567aMonitoring 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 and undervoltage of 20 %. 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 ... 20 %, hysteresis is 5 %. The integrated response delay time is adjust- phase failure, undervoltage and phase sequence. The hystere- able from 0 ... 20 s and responds to undervoltage. If the direction sis is adjustable from 1 ... 20 V. In addition the device has a re- is incorrect, the device switches off immediately. Thanks to a sponse delay and ON-delay from 0 ... 20 s in each case. The in- special measuring method, a phase failure is reliably detected in tegrated response delay time responds to phase unbalance and spite of the wide voltage range from 160 ... 690 V AC and feed- undervoltage. If the direction is incorrect, the device switches off back up to 80 % through the load. When the mains voltage is immediately. Thanks to a special measuring method, a phase switched on, the green LED is lit. If the phase sequence at the failure is reliably detected in spite of the wide voltage range from terminals L1-L2-L3 is correct, the output relay picks up. If the 160 ... 690 V AC and feedback up to 80 % through the load. phase sequence is wrong, the red LED flashes and the output The 3UG46 14 monitoring relay can be operated on the basis of relay remains in its rest position. If a phase fails, the red LED is either the open-circuit or closed-circuit principle and with man- permanently lit and the output relay drops. ual or auto RESET. Note: With the closed-circuit principle selected The red LED is a fault diagnostic indicator and does not show the current relay status. The 3UG45 13 monitoring relay is suitable Wrong phase sequence for line frequencies of 50/60 Hz. L3-L2-L1 Phase failure and undervoltage 11/14 11/12 L1-L2-L3 L2-L3 L1-L2-L3 Hysteresis 5 % 21/24 -20 % 3~ n 21/22 11/14 Phase failure 11/12 L1-L2-L3 L2-L3 L1-L2-L3 21/24 21/22 11/14 NSB0 01569a LED rd 11/12 OFF ON OFF ON OFF 21/24 Phase loss Delay 21/22 Wrong phase sequence Undervoltage L3-L2-L1 < Hysteresis x-y 11/14 11/12 11/14 11/12 21/24 21/22 21/24 LED rd 21/22 OFF FLASH OFF Delay Phase sequence onDelay Unbalance Hysteresis > Asy 2 % 0 % 11/14 11/12 21/24 21/22 Delay onDelay Siemens 2010 60 NSB0 01570a NSB0 01571a NSB0 01576a NSB0 01578a NSB0 01577a