Bender ISOMETER isoCHA425 Manual page 17

Wiring diagram
AC
DC
Figure: Wiring diagram
Legend to wiring diagram
Terminal
A1, A2
E, KE
L+, L–
T/R
11, 14
11, 24
A, B
E
L+ L-
Test / Reset
T/R
Connection to the supply voltage U
If supplied from an IT system, protect both lines by a fuse.*
Connect each terminal separately to PE:
Use same wire cross section as for 'A1', 'A2'.
Connection to the system to be monitored
Indication in display: 'L1' for L+; 'L2' for L-
Connection for the external combined test and reset button
Connection to alarm relay 'K1'
Connection to alarm relay 'K2'
RS-485 communication interface with connectable terminating resistor
Example: Connection of a BMS Ethernet gateway COM465IP
U
S
6 A 6 A
KE A1 A2
E KE A1 A2
L+ L-
k
AL1 AL2
ON
T R MENU
R
24
14 11
on
off
T/R A B
K1 K2
14 24 11 A
Connections
via fuse (line protection):
s
isoCHA425_D00352_03_M_XXEN/08.2023
ISOMETER® isoCHA425
DC+
DC-
PE
R
COM465IP
B
RS-485
17