Panametrics DigitalFlow XGS868i, Руководство для стартапов, Страница: 25 / 86

DigitalFlow™ XGS868i Startup Guide 17
Chapter 1. Installation
1.7.5.5 Wiring an RTD Inputs Option Card
The Model XGS868i RTD (Resistance Temperature Device) inputs option card provides two or four direct RTD inputs
(designated as A, B, C and D). Each RTD input requires three wires, and should be connected as shown on the label in
the rear cover (see Figure 3 on page 6 and Figure 11 on page 24). However, before making any connections, complete
the steps in Preparing for Wiring on page 13.
1.7.5.6 Wiring a 0/4-20 mA Analog Outputs Option Card
The analog outputs option card includes two isolated 0/4-20 mA outputs (designated as A and B). Connections to
these outputs may be made with standard twisted-pair wiring, but the total current loop impedance for these
circuits must not exceed 1,000 ohms.
Before making any connections, complete the steps in
Preparing for Wiring on page 13. Then, wire this option card
with the connections shown on the label in the rear cover (see Figure 3 on page 6 and Figure 11 on page 24).
1.7.5.7 A Specific Example
To illustrate the procedures described in the previous sections for wiring the option cards, a specific example may
prove helpful. Assume that a Model XGS868i is equipped with an option card numbered
703-1223-08. Table 14 on
page 59 indicates that this option card includes two analog current inputs and two standard alarm relays.
By referring to Figure 11 on page 24, it is determined that the appropriate connection diagram for this option card is
the first one from the left in the middle row. This label should also be found inside the rear cover of the XGS868i. Based
on this information, wiring of the Input/Output connections to terminal block J2 should be completed as shown in
Table 4.
Table 4: Wiring a 703-1223-08 Option Card
J2 Pin # Description Connection
1 Alarm A Normally Open
2 Alarm A Common
3 Alarm A Normally Closed
4 Alarm B Normally Open
5 Alarm B Common
6 Alarm B Normally Closed
7 Out C +24 V to Input C
8 Input C Signal (+)
9 Input C Return (-)
10 Out D +24 V to Input D
11 Input D Signal (+)
12 Input D Return (-)