Protection Relays Voltage Monitoring Relays DLMU SERIES Description The DLMU Series is a universal voltage, 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 Wiring Diagram is detected. Adjustable time delays are included to prevent nuisance tripping and short cycling of sensitive equipment. The isolated, 10A, SPDT and 2A alarm output 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 L1, L2, L3 = Line Voltage Input acceptable frequency range are fixed. Both delta and wye NO = Normally Open Contact systems can be monitored no connection to neutral is required. NC = Normally Closed Contact Operation C = Common, Transfer Contact Upon application of line voltage, the output is de-energized and the restart delay begins. If all the 3-phase voltages are CAUTION: 2 amp max. fast acting fuses are recommended to protect the equipments wiring. within the acceptable range, the output energizes at the end They are not required to protect the DLMU. of the restart delay. The microcontroller circuitry automatically senses the voltage range, and selects the correct operating = Select alarm contact connection as N.O. or N.C. when ordering frequency (50 or 60Hz). The over and undervoltage trip points N.O. Shown. are set automatically. 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 Features & Benefits value before the trip delay expires, the trip delay is reset and the output remains energized. Under, over, and unbalanced voltages FEATURES BENEFITS plus over or under frequency must be sensed for the complete Proprietary Constant monitoring to protect against phase loss, trip delay before the unit trips. The unit trips in 200ms when microcontroller phase reversal, over voltage, under voltage, based circuitry unbalance, short cycling and over/under frequency phase loss or reversal are sensed. The unit will not energize if a fault is sensed as the line voltage is applied. Universal line Flexibility to work in 200 to 480VAC or 500 to voltage range 600VAC applications Reset: Reset is automatic upon correction of the voltage or DIN rail (35mm) or frequency fault or phase sequence. Installation flexibility surface mounting Provides diagnostics of relay, fault and time LED indication delay status User adjustable Prevents nuisance tripping and short cycling of time delays sensitive equipment Ordering Information MODEL LINE VOLTAGE OUTPUT RESTART FUNCTION VOLTAGE UNBALANCE TRIP DELAY RESTART DELAY DLMHBRAAA 500 to 600VAC SPDT & NO Staggered restart Adjustable 2 - 10% Adjustable 1 - 30s Adjustable 0.6 - 300S DLMUBLAAA 200 to 480VAC SPDT & NO Lockout, min off time Adjustable 2 - 10% Adjustable 1 - 30s Adjustable 0.6 - 300S DLMUBNAAN 200 to 480VAC SPDT & NO No restart delay Adjustable 2 - 10% Adjustable 1 - 30s None DLMUBRAAA 200 to 480VAC SPDT & NO Staggered restart Adjustable 2 - 10% Adjustable 1 - 30s Adjustable 0.6 - 300S If you dont find the part you need, call us for a custom product 800-843-8848 2016 Littelfuse Protection Relays & Controls Rev: 1-A-062716 wwwwww.littelfuse.com/dlmu.littelfuse.com/Protection Relays Voltage Monitoring Relays DLMU SERIES Undervoltage & Voltage Restart Delay Options L = Lockout or minimum OFF time. The restart delay begins Unbalance Type Voltage detection with delayed trip & when the output trips. The unit cannot be re-energized until the restart delay is complete. This provides a minimum off time automatic reset Overvoltage or lockout time to allow equipment sensitive to short cycling, time to reset. If the fault is corrected after the restart delay is TripVoltage 109 - 113% of the adjusted line voltage Reset Voltage -3% of the trip voltage complete the output energizes immediately. The restart delay also occurs when line voltage is applied/reapplied. Undervoltage Trip Voltage 88 - 92% of the adjusted line voltage R = Restart Delay on fault correction. The restart delay begins Reset Voltage +3% of the trip voltage when line voltage is reapplied or when a voltage fault is Voltage Unbalance Adjustable 2 - 10% or specify fixed unbalance corrected. This option is normally selected when staggered of 2 - 10% in 1% increments restarting of multiple motors on a power system is required. Reset on balance -0.7% unbalance N = No Restart Delay. 0.6 second initialization delay on Trip Delay application of line voltage applies. Active On Over/undervoltage, voltage unbalance, over/ Restart Notes: All restart options remain reset when the under frequency following conditions are detected: Range Adjustable from 1 - 30s or specify fixed delay 1 - 30s in 1s increments 1. Phase loss (phase unbalance greater than 25%) Tolerance 15% 2. Average line voltage less than 120VAC Restart Delay 3. Phase reversal Range Adjustable from 0.6 - 300s if no restart delay The restart delay begins when the condition is corrected. is selected a 0.6s initialization delay applies LED Operation Tolerance 15% The LED flashes green during the restart delay, then glows Over/Under Frequency 4% Reset 3% 50/60 Hz green when the output energizes. It flashes red during the trip Phase Sequence A, B, C, L1, L2, L3 delay then glows red when the output de-energizes. It flashes Response Time -Phase red/green if phase reversal is sensed. If a fault is sensed during Reversal & Phase Loss 200 ms the restart delay, the LED will glow red during that portion or the Reset Automatic full restart delay. Output Type Isolated Electromechanical Relay Form C Isolated, SPDT Accessories Form C Rating 10A resistive 240VAC 8A resistive 277VAC NO-1/4 hp 120VAC LPSM003ZXID (Indicating), 1/3 hp 240VAC LPSM003Z (Non-indicating) Fuse Holders Littelfuse POWR-SAFE Dead Front holders provide optimum protection to personnel for Form A Isolated, NO, SPST Class CC and Midget-Style fuses. 600 VAC/DC Form A Rating 2A 277VAC 6 3 Life Mechanical - 1 x 10 Electrical - 1 x 30 0KLK002.T Midget Fuse (2 Amp) Protection 10 x 38 fast acting, high-interrupting capacity, Phase Reversal/Failure ASME A17.1 Rule 210.6 current-limiting type fuse. 600 Vac/500 Vdc Motors and Generators NEMA MG1 14:30, 14:35 C103PM (AL) DIN Rail Surge IEEE C62.41-1991 Level B 35 mm aluminum DIN rail available in a 36 in. Isolation Voltage 2500V RMS input to output (91.4 cm) length. Mechanical Mounting Surface mount with 2 8 (M4 x 0.7) screw or snap on 35mm DIN Rail Specifications Note: 0.25 in.(6.35 mm) spacing between units or other devices is required Line Voltage Dimensions H 110 mm (4.33) W 75 mm (2.95) Type 3-phase delta or wye with no connection D 50 mm (1.97) to neutral Termination Screw terminals with captive wire clamps for Operating Voltage 2 up to 14 AWG (2.5 mm ) wire 200-480VAC Voltage Line Line Voltage Range Adj.Range Frequency Max. Terminal Torque 4.4 in.-lbs. Environmental 240 200-240VAC 50/60Hz Operating/Storage 380 340-420VAC 50Hz Temperature -40 to 60C / -40 to 85C 480 400-480VAC 60Hz 550VAC Humidity 95% relative, non-condensing 600VAC 600 500-600VAC 50/60Hz 600VAC Weight 8.6 oz (244 g) AC Line Frequency 50/60 Hz automatically detected Phase Loss 25% unbalance Response Time 200ms 2016 Littelfuse Protection Relays & Controls Rev: 1-A-062716 wwwwww.littelfuse.com/dlmu.littelfuse.com/