Instructions for Use
ComPass B 4023841-001
Short-circuit tripping ↓B Figure 12:
(direction of the line "forward")
Short-circuit faultFigure 13:
Earth fault tripping ↓B Figure 14:
(direction of the line "forward")
Occurrence of an earth faultFigure 15:
Relays •
The ComPass B is provided with 4 relays. Each relay can be congured individually, for
example in order to indicate various fault types and directions, e.g. relay 1 for a phase-to-
phase fault in forward direction, and relay 2 for phase-to-phase fault in reverse direction etc.
If a relay is congured for momentary contact it will engage for 1s for every fault assigned
to it, whereas, if it is congured for permanent contact, it will remain engaged as long as
ComPass B is indicating the fault. If a second fault occurs, it will disengage for 1s and then
re-engage.
RS485/MODBUS interface •
ComPass B stores every fault in its internal memory. The last 20 events are stored including
date, time and data of fault direction (A or B). In addition, also the measured values are
stored at the time the fault is generated and 2 s before the fault occurs. The memory can be
read out either via the RS485/MODBUS interface or manually on the OLED-Display.
Reset modes3.1.6.
ComPass B can be congured to stop fault indication:
after expiration of a pre-dened time (between 1 min and 24 h) •
via external input contact •
locally via the rocker switch•
by remote control via the RS485/MODBUS interface •
on restoration of system voltage•
9
Dipl.-Ing. H. Horstmann GmbH
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