- Emerson Remote Terminal Unit Instruction Manual

CI-ControlWave Express Installation & Operation / 2-19
Note:
Cable shields associated with AI wiring should be connected to the ControlWave Express
Chassis Ground. Multiple shield terminations will require a user supplied copper ground
bus. This ground bus must be connected to the ControlWave Express Chassis Ground
(using up to a #4 AWG wire size) and must accommodate a connection to a known good
Earth Ground (in lieu of a direct connection from the ControlWave Express Chassis
Ground) and to all AI cable shields. Shield wires should use an appropriate Terminal Lug
and should be secured to the copper bus via industry rugged hardware (screw/bolt, lock
washer and nuts).
Table 2-7 - Analog Input Circuitry Jumper Assignments
Jumper Purpose Notes
JP4 AI Field Power
Pins 1-2 installed = External Power
Pins 2-3 installed = System Power
JP5 – JP7
Configures AI1 through
AI3 (respectively)
Pins 1-2 installed = 4-20mA AI
Pins 2-3 installed = 1-5V AI
2.3.4.7 Non-isolated Analog Output
Process I/O Board Terminal Block connector TB7 provides interface to 1 Analog Output.
The AO channel can be configured for an internal or external power source via jumper JP3.
External power can range from +11 to + 30 Vdc. It should be noted that Analog Output
circuitry associated with 6V units MUST be configured for external power
operation.
Analog Output circuitry consists of a 12-bit resolution Digital to Analog Converter, a V to I
circuit and a V to V circuit. 4 to 20mA or 1-5V operation is configured via SW1-4. The AO
channel is self-calibrating.
2.3.4.7.1 Analog Output Configurations
The Analog Output circuit utilizes two Configuration Jumpers that accommodate 1-5V or 4-
20mA AO operation (JP1) and AO Power selection (JP3), i.e., system power (nominally 12
or 24 Vdc) or external power (11 - 30Vdc). Switch SW1-4 is also used to select calibration
data for the AO’s current/voltage operation. The maximum external load that can be
connected to the 4-20mA output is 250 ohms (with an external 11V power source) or 650
ohms (with an external 24V power Source). The maximum external load current for the 1-
5V output is 5mA (with an external 11 to 30 V power source). AO operation requires either
an 11 to 30Vdc power source (connected to TB7-3 and TB7-4) or the unit’s power supply
(nominally 12 or 24 Vdc). Note: External power can be supplied by Bristol
ControlWave Loop Power Supply which supplies a regulated and isolated +24Vdc
(see PIP-ControlWaveLS).
Table 2-8 - Analog Output Circuitry Jumper/Switch Assignments
Jumper/
Switch
Purpose Notes
JP1 AO1 Field Output Source Config.
Pins 1-2 installed = 4-20 mA AO
Pins 2-3 installed = 1-5V AO
JP3 A/IO Power
Pins 1-2 installed = System Power
Pins 2-3 installed = External Power
SW1-4 AO Field Output Source Config.
SW1-4 ON = Voltage
SW1-4 OFF = Current
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