Serial interfaces
75
IRDH375_D00124_05_M_XXEN/01.2020
The following table gives an overview about essential alarm messages and
the assignment of the messages indicated on the display or operator panels,
e.g. PRC1470.
The BMS function is completely available in the standby mode
(Stand-by: F1/F2).
7.4.3 Commissioning of an RS-485 network with BMS protocol
Connect the terminals A and B of all bus nodes in one line
Switch the terminating resistors on at the beginning and end of the
RS-485 network or in case of devices without a terminating switch, at
the end of the bus, connect a 120 Ω resistor to the terminals A and B.
Switch the supply voltage U
S
on.
Determine one IRDH375 as the Master and assign address 1.
Assign the addresses (2…30) subsequently to all other IRDH375B
devices and other bus nodes (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 ISOMETERs® to be queried. Before starting the query, the
address of the ISOMETER® has to be entered.
Message Channel Meaning
Insulation Fault 1 Insulation resistance < setting Alarm 1
Insulation Fault 2 Insulation resistance < setting Alarm 2
Connection system 3 Connection error L1/L2 against system
Connection PE
4
Connection error /KE against PE con-
ductor
Device error 5 Internal device error
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