Serial interface
61
isoLR275_D00127_00_M_XXEN/07.2018
The following table gives an overview about essential alarm messages and
the assignment of the messages indicated on the display or alarm indicator
and test combinations, e.g. MK800.
In the standby mode, the BMS function is completely available
(Stand-by: F1/F2).
6.3.3
Commissioning of an RS-485 network with BMS protocol
Connect the terminals A and B of all bus devices in one line
Switch the terminating resistors on at the start and the end of the
RS-485 network. If a device at the end of the bus is not terminated,
connect a 120 Ω resistor to the terminals A and B.
Switch the supply voltage on.
Determine one isoLR275 as the master and assign address 1
Assign the addresses (2…30) subsequently to all other isoLR275 and
other bus devices (see table below)
Check whether a flashing point appears on all devices
(BMS commands are being received)
The sub menu "ISO-Monitor" in the COM SETUP menu allows insulation
values of the ISOMETER®s to be queried. Enter the address of the
ISOMETER® before starting the query.
Alarm
Channel
Note
Insulation Fault
1
Insulation resistance < setting value Alarm 1
Isolation Fehler
2
Insulation resistance < setting value Alarm 2
Mains power
connection
3
Connection fault L1/L2 against IT system
Connection PE
4
Connection fault
/KE against PE con-
ductor
Device error
5
Internal device error
