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Table of Contents
Summary of Contents for UfE ENS31
- Page 1 ENS31 Automatic Isolation Unit Product Description Issue 09/2005...
- Page 2 Note If you have any queries and need to contact UfE GmbH, always have the serial number close to hand in order to make reference to it. We do not claim the documentation is free of errors and mistakes. Please inform UfE GmbH of any errors found in the documentation.
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Page 3: Table Of Contents
Mounting on the top hat rail ......15 Electrical connections...........16 4.2.1 Basic configuration ........16 4.2.2 Demands of the switching elements ....16 4.2.3 Circuitry ............17 Advantages for the Customer ..........19 Technical Data ..............20 Product Description ENS31 Page 3 of 20 Version: A.02 Issue: 20.09.2005... -
Page 4: Purpose Of The Product
3-phase power feeding systems. It prevents uncontrolled island effects following failure or shutdown of the public electricity supply. The ENS31 complies with DIN VDE 0126-1-1 and is approved as a sub- stitute for manual isolation devices up to a 30 kW feeding power. -
Page 5: System Description
In the event of faults in the mains supply, the ENS31 interrupts the feed- ing of electricity in the mains to prevent island effects. The contact-based disconnection is initiated by externally provided con- tactors with positively driven NC contacts. -
Page 6: Lcd Displays And Leds
Chapter 2 System Description LCD display and LEDs The following indicators are mounted on the front side of the ENS31: X XXXXX A) LCD The unit and mains power status is shown on a 2-line LC display. Each line can display 16 characters. -
Page 7: Connections
Chapter 2 System Description Connections The following connections are provided at the top edge of the ENS31: < R E L A I S <KONTAKTE < N E T Z N L1 L2 L3 1 2 3 4 A 4 connection terminals for contactor control, potential-free,... -
Page 8: Behaviour Of The Isolation Unit
Behaviour of the Isolation Unit Behaviour of the Isolation Unit General information The ENS31 monitors the mains power supply and prevents uncontrolled island effects developing in the event of a power failure or the mains be- ing switched off. It reacts to fluctuations in: •... -
Page 9: Deviation Of The Mains Power Frequency
1 ohm and 0.2 ohm. Note A threshold of 0.5 ohm is set ex works. The automatic adaptation of the switching threshold is described in Sec- tion 3.8. Product Description ENS31 Page 9 of 20 Version: A.02 Issue: 20.09.2005... -
Page 10: Influence Of Isolation Units On Each Other
Behaviour of the Isolation Unit Influence of isolation units on each other When isolation units of the type ENS31 are used, they can be imple- mented in dense proximity in the public electricity supply without it lead- ing to operational problems. Even in the case of long network spurs and a mains supply subject to frequent faults, unproblematic operation can be guaranteed. -
Page 11: Automatic Calibration Of The Impedance Measurement
Manual calibration is no longer necessary. To complete the calibration, the precision resistor is electronically bridged several times per second and the resulting impedance changes used as a reference for the calibration. mains Product Description ENS31 Page 11 of 20 Version: A.02 Issue: 20.09.2005... -
Page 12: Automatic Adaptation Of Switching Thresholds To The Mains Power Conditions
Before the switching threshold is adapted to a less sensitive value, the ENS31 switches off briefly in order to check whether the power supply is still available. The threshold is only changed to a less sensitive value when it is recognised that the situation does not concern an uncontrolled island effect. -
Page 13: Automatic Synchronisation / Limitation Of Signal Strength In The Case Of Frequent Use Of The Ens
They only generate a few signals themselves and use the jointly generated test signal as a pilot tone which can be measured at the mains power connection point. local power supply Product Description ENS31 Page 13 of 20 Version: A.02 Issue: 20.09.2005... -
Page 14: Installation
4.1.2 Conditions for installation The ENS31 is intended for installation on a top hat rail in an electrical cabinet or in a meter cabinet. It cannot be installed anywhere. The cabinet must be sufficiently large to house the ENS31, providing the necessary contactors, protect the unit from moisture, dust, dirt and heat. -
Page 15: Preparing The Electrical/Meter Cabinet
Determine the installation position of the ENS31 on the top hat rail. Saw a cut-out in the cabinet cover at the installation position of the ENS31 so that you can see the ENS31 and its indicators (LCD and LEDs) without opening the cabinet. -
Page 16: Electrical Connections
ENS. Risk of accident! The ENS31 must be protected by pre-fuses in the mains feed circuit (min. 6 A, max. 25 A). Observe the circuit diagram. 4.2.2... -
Page 17: Circuitry
Chapter 4 Installation 4.2.3 Circuitry Check that the mains power lines and power feed lines are not conducting electricity. Switch the power generator (feeder), ENS31 and contactors as follows: -K10.1 -K10.2 * * * min. 6 A -K10.1 -K10.2 max. 25 A... - Page 18 MUST be connected to the ENS31 otherwise the unit may be damaged. If the ENS31 is switched on and off by means of a system control unit, the L1 connection of the ENS31 can be switched by means of a relay.
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Page 19: Advantages For The Customer
• automatic, maintenance-free operation without recurrent tests, • automatic synchronisation and limitation of signal strength following frequent use (several ENSs in local mains power supply). Product Description ENS31 Page 19 of 20 Version: A.02 Issue: 20.09.2005... -
Page 20: Technical Data
< 185 V (response time 0.2 s) Undervoltage + 0,2 Hz / -2,5 Hz Frequency deviation (response time 0.2 s) > 0.5 Ohm (response time 0.5 s) Impedance jump detection Page 20 of 20 Product Description ENS31 Version: A.02 Issue: 20.09.2005...
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