Field Bus Connections And Openbas-Acc-Db9; Figure 22 Field Bus Connections; Table 9 Field Bus Ports - Mircom OpenBAS-HV-NX10 Series Installation Manual

Table 8 Surge Protection on Relay Outputs (Continued)
Type of field
device
24 VAC coil
4.6

Field Bus Connections and OpenBAS-ACC-DB9

Figure 22 Field bus connections

Table 9 Field Bus Ports

Port Driver Module
COM1 RS-485
COM2 RS-485
COM3 RS-485
Note 1: P3 and COM3 are functional only on OpenBAS-HV-NX10D.
Note 2: Each of the three P ports allow the field replacement of the RS-485 modules with the
OpenBAS-ACC-RS485 optically isolated RS-485 module or OpenBAS-ACC-RS232
conversion module. See section 3.3.1 on page 13.
Note 3: To avoid intermittent communication blackouts, the isolation provided by the
OpenBAS-ACC-RS485 module is highly recommended for noisy environments, and to prevent
damage to the boards in extreme cases, especially if the OpenBAS-HV-NX10 series controller
is inside an enclosure containing high voltage wiring.
4.6.1 OpenBAS-ACC-DB9
OpenBAS-ACC-DB9 is a DB9 adapter which is installed in one of the field bus ports.
36 (45)
Notes
Install a 36 V MOV surge
protector in parallel with coil of
solenoid to suppress noise.
Functional
Yes
Yes
OpenBAS-HV-
NX10D only
Wiring diagram
24 VAC coil
24 VAC
0 V
ref1d1+ d1- ref2 d2+ d2- ref3 d3+ d3-
COM1
Optional Driver
Yes
Yes
OpenBAS-HV-
NX10D only
Field Wiring
NC
C
Controller
NO
COM2 COM3
Comments
See notes 1, 2 and 3