GE DigitalFlow XMT868i, Руководство для стартапов

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DigitalFlow™ XMT868i Startup Guide 9
Chapter 1. Installation
1.7.3 Wiring Standard 0/4-20 mA Analog Outputs
The standard configuration of the Model XMT868i flow transmitter includes two isolated 0/4-20 mA analog outputs
(designated as outputs 1 and 2). Connections to these outputs may be made with standard twisted-pair wiring, but the
current loop impedance for these circuits must not exceed 600 ohms.
To wire the analog outputs, complete the following steps:
1. Disconnect the main power to the unit and remove the rear cover.
2. Install the required cable clamp in the chosen conduit hole on the side of the electronics enclosure.
3. Refer to Figure 10 on page 23 for the location of terminal block
J1
and wire the analog outputs as shown.
Secure the cable clamp.
Note:
Analog outputs 1 and 2 in the wiring diagram correspond to analog outputs A and B in Slot 0 in the XMT868i
software.
4. If wiring of the unit has been completed, reinstall the rear cover on the enclosure and tighten the set screw.
Note:
Prior to use, the analog outputs must be set up and calibrated. See Chapter 1, Calibration , of the Service
Manual for detailed instructions.
Proceed to the next section to continue the initial wiring of the unit.
1.7.4 Wiring the Serial Port
The Model XMT868i flow transmitter is equipped with a built-in serial communications port. The standard port is an
RS232 interface, but an optional RS485 interface is available upon request. Proceed to the appropriate sub-section for
wiring instructions. For more information on serial communications refer to the
EIA-RS Serial Communications
manual (GE document 916-054).
WARNING!
To meet CE Mark requirements, all cables must be installed as described in
Appendix A, CE Mark Compliance .
WARNING!
Make sure both covers, with their O-ring seals, are installed and the set screws are
tightened before applying power in a hazardous environment.