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Resumen del manual
Larger gauge wire is recommended with distances over 1000’. Connect wires as shown in figure 4-4. For a 4-Wire isolated connection, set jumpers, located on the bottom of the transmitter board, to the upper position as illustrated in Figure x.x. Verify that both jumpers are in the position marked by 4-wire. When using a 4-wire connection, a minimum of 2 each of an 18 AWG, 2 conductor twisted/shielded pair cable must be used. A cable shield must never be used as a conductor. Larger gauge wire is recommended with distances over 1000’. Connect wires as shown in figure 4-4. 4.2.2 MODBUS OPERATION USING RS-485 CONNECTION Use a minimum of 18 AWG, 2 conductor for DC power connection. No shield required. In addition use a minimum of 24 AWG, low capacitance, shielded data cable for RS485 half duplex communication. The installation may be planned in a manner which provides up to 32 sensor modules on a single home run. Standard default RS485 Setting are: 38,400 baud, 8 bits, 1 stop bit, no parity TERMINATION RESISTOR JUMPERS: Termination resistors are used in RS-485 wire runs to provide impedance matching. The IT series modules use a 120 Ohm resistor for this function. The cable being used for this RS-485 connection must have a minimum of 100 Ohm impedance with a maximum of 120 Ohms. Installations where the cable length is under 100’, termination resistors may not be required. In installations where the cable length is greater than 100’, it is recommended to place the termination jumpers on the first device and last device on the RS-485 wire run. Termination jumpers must be removed from all other modules connected between the first and last device. The first device in the RS-485 multiplexed bus is usually a gas controller or PLC. Factory term resistor setting is “not enabled.” BIAS JUMPERS: (BIAS A, BIAS B) Bias resistors are used to force RS-485 receiver outputs to a known (fail-safe) state, when the bus is idle. Bias jumpers are always installed in pairs as the bias must be placed on both the TX A and TX B lines. Sierra Monitor’s IT series of toxic gas sensors automatically apply the bias jumpers, and are factory installed so that the bias is always enabled. 4.2.3 SENTRY OPERATION USING SMC SENTRY CONNECTION (FIGURE 4-7) Use a minimum of 18 AWG, 3-conductor cable up to 2000’. The cable may or may not be shielded. We recommend shielded cable in circumstances that there could be RF or EM interference present. Shield to be terminated and grounded only at the Sentry controller. Shield must be cut and dressed at the module end so that no part of it comes in contact with the conduit or ground. NOTE Be sure to follow all local electric code and safety requirements when installing the 5100-XX-IT Gas Sensor Module 4.2.4 GENERAL Install conduit as required by local code or construction specifications. Provide for splice boxes where multiple modules will be wired to a single run. Pull conductors of the correct gauge wire from the controller to each splice box and from the respective splice box to each planned module location. See for proper wire termination in the splice box. Twisted wire secured with wire nuts is not an acceptable splice. NOTES The drain wire of shielded cable must NOT be used as one of the conductors. Installation and wiring must be in accordance with the National Electrical Code. Temperature rating of cable wire must be at least 75oC. If cable runs through higher temperature environments, it must be specified for that environment. Page: 9 Model 5100-XX-IT Toxic Gas Sensor Module 4.3 ENCLOSURE INSTALLATION To protect the transmitter and sensor assembly they should be removed from the enclosure and preserved until final installation and wiring termination. Number of modules Maximum length of wire run (feet) 500 1,000 2,000 3,000 5,000 1 18 18 16 16 14 2 18 18 14 12 xx 3 18 16 12 xx xx 4 16 14 12 xx xx Table 4 - 2: Minimum Wire Gauges Prior to installation and wiring: 1. Remove the transmitter from the module housing by: • Unscrew the two captive panel screws on the faceplate. • Lift the transmitter out of the enclosure. • Unplug the sensor cable from transmitter connector P2. • Remove the sensor assembly from the enclosure hub. 2. Install the module enclosure onto the end of the supply conduit and/or bolt into position as required. NOTE When enclosure earth grounding is required for the installation a grounding lug is located in the base of the enclosure. Install the earth ground under the green ground screw. 4.4 TRANSMITTER AND SENSOR INSTALLATION When all pre-wire is complete: 1. Install sensor assembly in the open hub on the module enclosure. The sensor assembly thread must be fully seated into the hub and tightened to maintain explosion proof assembly. 2. Connect the wires which return to the controller to interface board connectors P1, P2, P3 and P4 according to Figure 4-3 and Table 4-4. 3. Connect the sensor assembly cable to top transmitter board connector P2. 4. Align the headers between the top transm...
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