12
2.2 Power Requirements
Both the Gateway models are DC powered. The specified voltage range for
gateway-EP model is +24VDC + 5%. For Gateway-PP models power is supplied
from the PLC port cable and the supply voltage range is +5VDC + 5%. Make
sure to check PLC power before connecting cable to Gateway-PP models.
Please follow the instructions given below while making power supply
connections for Gateway-EP models:
Follow the wiring diagram on the sticker on the unit which shows
terminals for the positive DC, negative DC and Earth.
To make a connection strip about 1/4" of insulation of the wire, turn
the connector screw counter-clock wise until the gap is wide open.
Insert the wire all the way in and turn the screw clockwise until it is
tight.
Wire lengths should be minimum. Wires should run in pairs with a
neutral or common paired with a live or signal wire.
Please note that, gateway is not Fused internally. Fuse should be
connected from outside wherever required.
All the Gateway products are housed in a molded ABS plastic
case which eliminates any electrical shock hazard. Hence Safety
Earth is not required to be connected to the chassis of the unit.
The DC ground is not directly coupled to Earth ground internally. The
unit is designed to operate properly whether or not the DC ground is
connected to the Earth ground. We do recommend, however, that if
the DC ground has to be connected to the Earth ground, the Earth
connection should be made to a central star point as poor site earths
can introduce noise into a system.
Do not power Gateway and inductive loads with the same power
supply even though there is enough immunity in the Gateway to
withstand the transients present on these lines. Avoid using power
supplies with large capacitive outputs, which may cause problems if
power is cycled within a short time period.
If wiring is to be exposed to lightening or surges, use
appropriate surge suppression devices.
