HBD PV500-0007M1 User Manual page 21

PV500 series solar pumping inverters
Communication
Relay output
RS485+
RS485- communication
TA Normally open
(TA1) contact of relay 1
TB Normally closed
(TB1) contact of relay 1
TC Common terminal
(TC1)
485 485 communication terminals,
using the ModBus protocol
1. Contact capacity: 3A/AC250V,
1A/DC30V
2. They cannot be used for high
frequency switch output.
During the application of auto
power frequency & PV switching,
of relay 1
the AC input contactor coil is
controlled by the normally closed
contact of the relay.
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Installation guidelines