RC Systems ViewSmart 1600+, Руководство по эксплуатации

Страница: 19 / 141

UM-1097
Revision B 9
I/O Board (TB4 terminals 2, 4, 6 and 8), or directly from the optional 150 or 600Watt optional power
supply.
The two terminals (TB3 and TB4) are provided on each option board to allow for daisy changing of power
from one option board to the next without having to run individual sets of wires for every option board
back to the power supply.
3.3 Standard I/O Wiring
Recommended cabling for 24VDC power supply to all option boards is 16AWG. Power must be supplied
to each option board on TB3 or TB4, and can either be supplied from the DC out terminals on the Main
I/O Board (TB4 terminals 2, 4, 6 and 8), or directly from the optional 150 or 600Watt power supply.
Recommended cabling for RS-485 communications is 24-18AWG (shielded or unshielded) twisted pair.
Multiple devices may be connected on a single RS-485 loop using unique remote IDs. When connecting
devices in series, be sure that terminating resistors are removed from all but the final device on the
communication loop.
Option boards communicate to the CPU is through I 2 C connection from J3, or J4, back to the Main I/O I 2 C
ports (J1 or J2). Two ports are provided on each board to allow for daisy chaining of board back to the
single connector on the Main I/O.
3.3.1 Common Relays
The Common Relays are found on the Main I/O. There are 3 standard relays, a dedicated Horn Relay, and
a dedicated Fault relays. All relays are 5 Amp Single Pole Double Throw (SPDT) relays, and are rated at 5
Amps for 28VDC and 250~VAC Resistive Loads.
IMPORTANT : Appropriate diode (DC loads) or MOV (AC loads) snubber devices must be
installed with inductive loads to prevent RFI noise spikes. Relay wiring should be kept separate
from low level signal wiring.
Terminals for the Common Relays are found on TB2. The upper row of terminals are for the 3 Standard
Relays, and the Horn and Fault Relay Terminals can be found on the right side of the bottom terminals.
Relay terminals are labeled NO for the Normally Open terminal, C for the Closed terminal and NC for the
Normally Closed Terminal. The NO and NC nomenclature comes from the normal state of the relay (de-
energized state). The Fault Relay (and standard relays when placed in Failsafe Mode) is normally in the
energized state, and becomes de-energized when the Fault (alarm) condition is reached.
Only two wires are needed for wiring of relays. A typical wiring would have power wired to the C terminal,
and the NO and C terminals wired to the alarm device. Under normal operations the circuit between the
two terminals is open. When the alarm state is reached, the NO contact closes, and completes the circuit,
energizing the alarm device.
!