Protection Relays Voltage Monitoring Relays HLMU SERIES Description The HLMU Series is a universal voltage, encapsulated, 3-phase voltage monitor. It continuously measures the voltage of each of the three phases with microcontroller accuracy and compares the value to preset trip points. It separately senses phase reversal and loss; over, under and unbalanced voltages; and over or under frequency. Protection is assured during periods of large average voltage fluctuations, or when regenerated voltages are present. The unit trips within 200ms when phase loss is detected. Adjustable time delays are included to prevent nuisance tripping and short cycling of sensitive equipment. The isolated, 10A, DPDT relay contacts trip when a phase voltage exceeds the trip limits for the trip delay. Nominal line voltage, voltage unbalance, and time delays are knob adjustable. The phase loss setpoint and the acceptable frequency range are fixed. Both delta and wye systems can be monitored; no connection to neutral is required. Features & Benefits Wiring Diagram L1, L2, L3 = Line Voltage Input NO = Normally Open Contact NC = Normally Closed Contact C = Common, Transfer Contact CAUTION: 2 amp max. fast acting fuses are recommended to protect the equipment‘s wiring. They are not required to protect the HLMU. NOTE: Relay contacts are isolated, 277VAC max. Ordering Information MODEL OUTPUT RESTART FUNCTION VOLTAGE UNBALANCE TRIP DELAY RESTART DELAY HLMUDLAAA DPDT Lockout, min off time Adjust. 2 - 10% Adjust. 1 - 30s Adjust. 0.6 - 300s HLMUDN0405N DPDT No restart delay Fixed, 4% Fixed, 5s None HLMUDNAAN DPDT No restart delay Adjust. 2 - 10% Adjust. 1 - 30s None DPDT Staggered restart Adjust. 2 - 10% Adjust. 1 - 30s Adjust. 0.6 - 300s HLMUDRAAA If you don’t find the part you need, call us for a custom product 800-843-8848 © 2016 Littelfuse Protection Relays & Controls www.littelfuse.com/ www.littelfuse.com/hlmu FEATURES BENEFITS Proprietary microcontroller based circuitry Constant monitoring to protect against phase loss, phase reversal; over, under, and unbalanced voltage; over and under frequency Universal line voltage range Flexibility to work in 200 to 480VAC applications DIN rail (35mm) or surface mounting Installation flexibility LED indication Provides diagnostics of relay, fault and time delay status Encapsulated Protects against shock, vibration, and humidity Finger-safe terminal blocks Meets IEC 61000 safety requirements Operation Upon application of line voltage, the output is de-energized and the restart delay begins. If all the three-phase voltages are within the acceptable range, the output energizes at the end of the restart delay. The microcontroller circuitry automatically senses the voltage range, and selects the correct operating frequency (50 or 60Hz). The over and under voltage trip points are set at ± 10% of the adjusted line voltage. When the measured value of any phase voltage exceeds the acceptable range limits (lower or upper) the trip delay begins. At the end of the trip delay the output relay de-energizes. If the phase voltage returns to an acceptable value before the trip delay expires, the trip delay is reset and the output remains energized. Under, over, and unbalanced voltages plus over or under frequency must be sensed for the complete trip delay before the unit trips. The unit trips in 200ms when phase loss or reversal are sensed. The unit will not energize if a fault is sensed as the line voltage is applied. Reset: Reset is automatic upon correction of the voltage or frequency fault or phase sequence. Restart Delay Options L = Lockout or minimum OFF time. The restart delay begins when the output trips. The unit cannot be re-energized until the restart delay is complete. This provides a minimum off time or lockout time to allow equipment sensitive to short cycling, Rev: 1-A-062716 Protection Relays Voltage Monitoring Relays HLMU SERIES time to reset. If the fault is corrected after the restart delay is complete, the output energizes immediately. The restart delay also occurs when line voltage is applied/reapplied. R = Restart Delay on fault correction. The restart delay begins when line voltage is reapplied or when a voltage fault is corrected. This option is normally selected when staggered restarting of multiple motors on a power system is required. N = No Restart Delay. 0.6 second initialization delay on application of line voltage applies. Restart Notes: All restart options remain reset when the following conditions are detected: 1. Phase loss (phase unbalance greater than 25%) 2. Average line voltage less than 120VAC 3. Phase reversal The restart delay begins when the condition is corrected. LED Operation The LED flashes green during the restart delay, then glows green when the output energizes. It flashes red during the trip delay then glows red when the output de-energizes. It flashes red/green if phase reversal is sensed. If a fault is sensed during the restart delay, the LED will glow red during that portion or the full restart delay. Accessories LPSM003ZXID (Indicating), LPSM003Z (Non-indicating) Fuse Holders Littelfuse POWR-SAFE Dead Front holders provide optimum protection to personnel for Class CC and Midget-Style fuses. 600 VAC/DC 0KLK002.T Midget Fuse (2 Amp) 10 x 38 fast acting, high-interrupting capacity, current-limiting type fuse. 600 VAC/500 VDC C103PM (AL) DIN Rail 35 mm aluminum DIN rail available in a 36 in. (91.4 cm) length. P1023-20 DIN Rail Adapter Allows module to be mounted on a 35 mm DIN type rail with two #10 screws. Specifications Line Voltage Type Operating Voltage 200 - 480VAC Line Voltage Max. AC Line Frequency Phase Loss Response Time 3-phase delta or wye with no connection to neutral Range Voltage Adj. Range Frequency 240 200-240VAC 50 or 60Hz 380 340-420VAC 50Hz 480 400-480VAC 60Hz 550VAC 50/60 Hz automatically detected ≥ 25% unbalance ≤200ms © 2016 Littelfuse Protection Relays & Controls www.littelfuse.com/ www.littelfuse.com/hlmu Undervoltage & Voltage Unbalance Type Overvoltage Trip Voltage Reset Voltage Undervoltage Trip Voltage Reset Voltage Voltage Unbalance Trip Setpoint Reset on Balance Trip Delay Active On Range Tolerance Restart Delay Range Tolerance Over/Under Frequency Phase Sequence Response Time-Phase Reversal & Phase Loss Reset Output Type Form Rating Life Protection Phase Reversal/Failure Motors and Generators Surge Isolation Voltage Circuitry Mechanical Mounting Dimensions Termination Environmental Operating/Storage Temperature Humidity Weight Voltage detection with delayed trip & automatic reset 109 - 113% of the adjusted line voltage ≅ -3% of the trip voltage 88 - 92% of the adjusted line voltage ≅ +3% of the trip voltage Adjustable 2 - 10% or specify fixed unbalance of 2 - 10% in 1% increments ≅ -0.7% unbalance Over/undervoltage, voltage unbalance, over/under frequency Adjustable from 1 - 30s or specify fixed delay 1 - 30s in 1s increments ± 15% Adjustable from 0.6 - 300s; if no restart delay is selected a 0.6s initialization delay applies ± 15% ±4%; Reset ±3%; 50/60 Hz A, B, C, L1, L2, L3 ≤200 ms Automatic Isolated Electromechanical Relay DPDT 10A resistive @ 240VAC; 8A resistive @ 277VAC; NO-1/4 hp @ 120VAC; 1/3 hp @ 240VAC Mechanical - 1 x 10 6 Electrical (at 10A) - DPDT - 1 x 30 3 ASME A17.1 Rule 210.6 NEMA MG1 14:30, 14:35 IEEE C62.41-1991 Level B ≥ 2500V RMS input to output Encapsulated Surface mount with one #10 (M5 x 0.7) screw Note: 0.25 in.(6.35 mm) spacing between units or other devices is required H 76.7 mm (3.0”); W 50.8 mm (2.0”); D 41.7 mm (1.64”) Screw terminal connection up to 12 AWG (3.3 mm2) wire -40° to 60°C / -40° to 85°C 95% relative, non-condensing ≅ 3.9 oz (111 g) Rev: 1-A-062716