Panametrics DigitalFlow XMT868i, Руководство для стартапов, Страница: 17 / 94

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.
WARNING!
To meet CE Mark requirements, all cables must be installed as described in Appendix A, CE Mark
Compliance .
4. If wiring of the unit has been completed, reinstall the rear cover on the enclosure and tighten the set screw.
WARNING!
Make sure both covers, with their o-ring seals, are installed and the set screws tightened before
applying power in a hazardous environment.
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 (916-054).