Commissioning Of An Rs485 Network With Bms Protocol - Bender ISOMETER IRDH275 Handbuch

Serial interfaces
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.
Message
Insulation Fault
Insulation Fault
Connection system
Connection PE
Device error
The BMS function is completely available in the standby mode
(Stand-by: F1/F2).
7.4.3

Commissioning of an RS485 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
RS485 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
• Determine one IRDH275 as the Master and assign address 1.
• Assign the addresses (2...30) subsequently to all other IRDH275B
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 ISOMETER®s to be queried. Before starting the query, the
address of the ISOMETER® has to be entered.
IRDH275_D00122_03_M_XXEN/05.2017
Channel
Meaning
1 Insulation resistance < setting Alarm 1
2 Insulation resistance < setting Alarm 2
3 Connection error L1/L2 against system
Connection error
4
conductor
5 Internal device error
on.
S
/KE against PE
71