Instructions for Use
ComPass B 4023841-001
LED
Meaning
green
ComPass B is powered from external supply (permanent light)
•
No error (permanent light)
•
yellow
Test mode (single flashing LED) and device error (double flashing LED;
•
contact after-sales service)
red
Fault in the MV system (LED flashes)
•
No indication, external supply not connected.
•
No error present.
•
Indication of operating conditions by multicolour LED
Table 1:
Rocker switch
The rocker switch is used for navigating the plain text menus on the display.
Up:
Scroll up in a menu.
1.
Change (increase) a parameter.
Down:
Scroll down in a menu.
2.
Change (reduce) a parameter.
Left:
Leave menu (abort).
3.
Jump to main menu.
Right:
Call submenu.
4.
Save a changed parameter.
1.
4.
3.
2.
Execute a command.
Rocker switch
Figure 17:
RS485/MODBUS interface
3.3.2.
The RS485/MODBUS interface is used for remote control, remote readout and remote parameteri-
zing of ComPass B.
The ComPass B uses a 2-wire interface according to the RS485 standard with no line termination
in the ComPass B.
The ComPass B is a MODBUS Remote Terminal Unit (RTU) Slave.
Digital inputs/outputs
3.3.3.
The ComPass B is provided with 4 digital (relay) outputs and one digital input. Each relay output
can be assigned with individual functionality either via the front panel control or the RS485/MOD-
BUS interface.
Power Supply
3.4.
The ComPass B is powered by an external 24-230 V AC/DC ±10 % supply. An incorporated lithium
cell provides the energy in case of lack of external voltage supply, so the readout of all saved data
is ensured in case of a fault.
If external power supply stops, the ComPass B will stop short-circuit and earth fault detection as
well as MV network monitoring and communication via the RS485/MODBUS interface. It is ensured
that the relays are energized, even in case of a fault.
11
Dipl.-Ing. H. Horstmann GmbH
