3 Phase system monitoring

Application

to monitor AC or DC system voltages using neutral conductor.
indication if the voltage drops below 85% of the correct system voltage (see VDE 0108). No symmetrical measurement of the three phases.

Function:

Three-phase system monitoring can be used to monitor up to three voltages by comparison to the neutral conductor. When an input (L1, L2 or L3) goes below 85% of the system voltage, then the relay will drop out, and the LED will extinguish. When monitoring a single phase (alternating voltage), inout terminals L1, L2 and L3 must be connected via a jumper.

Note:

In the event of phase failure (eg as a result of a blown fuse), under inductive loads (three-phase induction motors) reverse induction can occur on the open line. If the voltage is large enough, this may lead to monitoring errors.

87.030.6353.0 [Schematic]
Input
Nominal voltage	230/400 V AC +6%/-10%
Power consumption	ca. 4 VA
Operating value	0.85 x U_N
Pickup/dropout delay	ca. 500 ms
Switching hysteresis	ca. 5%
Status display	LED
Output
Relay output	2 NC/NO
Switching voltage	250 V AC/DC
Switching capacity	max. 1100 VA/100W

How to contact us: Wieland may be contacted by calling us at: 1-800-WIELAND
or by email at: sales@wielandinc.com

Š1996

Wieland, Inc.
49 International Rd.
Burgaw, NC 28425
comments to: sales@wielandinc.com