Omega Speaker Systems RD8300 manual Analog Inputs, Thermocouple Inputs, Linear Inputs

Section 3 – Installation

Read the following procedures prior to connecting inputs to the terminals.

WARNING: Ensure the power is off before connecting signal inputs to the unit.

The plug in screw terminal connectors are of the clamping screw variety, putting even pressure on the signal wire. It is therefore not necessary to terminate the wires with lugs, however you may do so if you wish. The maximum gauge wire that can be accommodated is 14 AWG or 2.5 mm². You will need a small screwdriver and a pair of wire cutters and strippers. The use of shielded twisted lead wire is recommended to minimize electromagnetically induced noise.

WARNING: All unused inputs must have + and - contacts commoned together.

CAUTION: Never run signal and power or control wiring together in the same conduit. This is to prevent possible recording error due to induced signals between lines. If running cables is inevitable, use shielded cable where possible and properly ground the shield. Route signal wires away from power wires at the rear panel.

NOTE:	Ground cable shields at one end only to eliminate the possibility of interference due to
	ground loop currents. When grounded transducers are used, the shield should be
	grounded at the sensor end only.

3.4.3.1Analog Inputs

The Analog Input board can have 6 or 12 channels (12 shown below). Each Input is truly differential and has a positive (IN+) and negative (IN-) input and an RTD Common (COM) for RTD current return and Frequency input Common ONLY. Channels 1 and 6 (and optionally 7 and 12) have a Frequency Input (FIN) which is common with the COMmon input. All inputs are isolated to 350 Vac from each other and 2,000 Vac from the chassis ground.

Figure 3-9 Analog Input Module (12 Channels shown)

3.4.3.2Thermocouple Inputs

Thermocouple Input connections are made as shown in Figure 3-10 T/Cs. The ambient temperature compensator is between inputs 3 and 4.

3.4.3.3Resistance Temperature Detector (RTD) Inputs

Two or three wire RTDs may be used for connection with cable compensation of up to ±50 ohms. The “COM” Terminal is the common current return (Wire 3). Four wire RTDs can be used – simply do not connect the second + wire. Two wire RTDs require a jumper between (IN-) and (COM). Refer to Figure 3-10

3.4.3.4Linear Inputs

Linear Inputs are divided into two types:

Current inputs: 4-20 milliamps, 0-20 milliamps and 10-50 milliamps, using an external 50 ohm shunt (0.1% 0.5W).

Voltage inputs: +125mV, +250mV, +500mV +1.00V, +3.0V, +6.0V, +12.0V, +24.0V DC.

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09/11/2008 REV 0.99