Chapter 2
System Description
Version: A.02
Product Description ENS26
Page 5 of 20
Issue: 20.09.2005
2 System
Description
2.1
Principles of functioning
The ENS26 automatic isolation unit continually monitors
•
overvoltage and undervoltage
•
frequency deviation
•
impedance jumps
in the public electricity supply.
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.
The contact distance within the relay is in accordance to the overvoltage
category 2 at 250 V AC.
The safety functions are executed in a dual channel system, whereby each
channel monitors the proper function of the other channel. In case of a
failure the channels disconnect independently from each other.
The channels monitor each other mutually (refer to the error protection in
accordance with DIN VDE 0126) to increase error protection. Therefore,
recurrent tests can be dispensed with.
Note
Further information on the principles of functioning is available on our
Internet site at
www.ufegmbh.de
.
