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Table of Contents
Summary of Contents for UfE ENS26
- Page 1 ENS26 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
Preparing the electrical/meter cabinet ..15 4.1.4 Mounting on the top hat rail ......15 Electrical connection.............16 4.2.1 Basic configuration ........16 4.2.2 Circuitry ............16 Advantages for the Customer ..........18 Technical Data ..............19 Product Description ENS26 Page 3 of 20 Version: A.02 Issue: 20.09.2005... -
Page 4: Purpose Of The Product
It prevents uncontrolled is- land effects following failure or shutdown of the public electricity supply. The ENS26 complies with DIN VDE 0126-1-1 and is approved as a sub- stitute for manual isolation devices up to a 5.75 kW feeding power. -
Page 5: System Description
In the event of faults in the mains supply, the ENS26 interrupts the feed- ing of electricity in the mains to prevent island effects. The disconnection of L and N is accomplished by two relays. Each relay is specified for a switching current of 25 A. -
Page 6: Lcd Display And Leds
Chapter 2 System Description LCD display and LEDs The following indicators are provided on the front side of the ENS26: X XXXXX A) LCD display (optional) The equipment status as well as the status of the monitored phase are pro- vided in a 2-line LC display. -
Page 7: Connections
Chapter 2 System Description Connections The following connections are provided at the top edge of the ENS26: <EINSPEISER <NETZ A 2 connection terminals to connect one phase and the neutral conductor (feeding unit) B 2 connection terminals to connect one phase and the neutral conductor... -
Page 8: Behaviour Of The Isolation Unit
Behaviour of the Isolation Unit Behaviour of the Isolation Unit General information The ENS26 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 ENS26 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 ENS26 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 ENS26 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 ENS26 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 ENS26 Page 13 of 20 Version: A.02 Issue: 20.09.2005... -
Page 14: Installation
4.1.2 Conditions for installation The ENS26 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 ENS26 and protect the unit from moisture, dust, dirt and heat. -
Page 15: Preparing The Electrical/Meter Cabinet
Preparing the electrical/meter cabinet Determine the installation position of the ENS26 on the top hat rail. Saw a cut-out in the cabinet cover at the installation position of the ENS26 so that you can see the ENS26 and its indicators (LEDs and optional LCD) without opening the cabinet. -
Page 16: Electrical Connection
Connection to the public electricity supply may only be performed by a properly qualified and authorized electrician. The ENS26 must be protected by a pre-fuse in the respective phase of the mains feed circuit (min. 6 A, max. 25 A). Observe the circuit diagram. - Page 17 MUST be connected to the ENS26 otherwise the unit may be damaged. If the ENS26 is switched on and off by means of a system control unit, the phase connection (L) of the ENS26 can be switched by means of a relay.
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Page 18: 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). Page 18 of 20 Product Description ENS26 Version: A.02 Issue: 20.09.2005... -
Page 19: Technical Data
+ 0.2 Hz / -2,5 Hz (response time 0.2 s) RoCoF = Rate of Change of > 1 Hz/s Frequency > 0.5 Ohm (response time 0.5 s) Impedance jump detection Product Description ENS26 Page 19 of 20 Version: A.02 Issue: 20.09.2005... - Page 20 Chapter 6 Technical Data For your notes Page 20 of 20 Product Description ENS26 Version: A.02 Issue: 20.09.2005...
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