NOVUS AirGate-GPRS - Manual (Page 9)

AirGate-GPRS
NOVUS AUTOMATION 9/29
ELECTRICAL INSTALLATIONS
The AirGate-GPRS has power source connectors for inputs and RS485 serial communication interfaces.
Be careful when connecting the power source wires to the AirGate-GPRS. If the
positive conductor of the power source is turned on, even for an instant, to one of the
communication connection terminals, the AirGate-GPRS can be damaged.
Fig. 03 - Power source and communication connections of the AirGate-GPRS
Fig. 04 shows the required electrical connections. Terminals 1, 2, and 3 belong to the first interface RS485/Modbus
(RS485-1), while terminals 4, 5, and 6 belong to the second interface RS485/Modbus (RS485-2). Terminals 7, 8, and 9
are for the inputs (analog or digital) of the equipment. Terminals 10, 11, and 12 are used to feed the AirGate-GPRS.
Fig. 04 – Electrical connections of the AirGate-GPRS
INSTALLATION RECOMMENDATIONS
• Input conductors should travel the system plant separately from the output and supply conductors, in grounded
electrical ducts.
• The power source of the instruments should come from a network that is appropriate for the instrumentation.
• The use of RC FILTERS (47 Ω and 100 nF, in series) parallel to the contactor coils and solenoids that are near or
connected to the equipment is recommended.
• In control applications, it is essential to consider what can happen when any part of the system fails. The relays of
output RL1 and RL2, used as alarms, do not guarantee total protection.
• Section of used wires: minimum gauge of 0.14 mm².
POWER SOURCE
Terminals 11 and 10 must be connected to the AirGate-GPRS power supply. Power supply polarity should be noticed.
RS485
The RS485 interfaces of the AirGate-GPRS have terminals for communication with 3 wires, including the common. The
wiring to the Modbus networks will depend whether each interface is configured to operate as a master or slave.