Hach Active 4-20 mA Manuel D'utilisation page 5

Table 2 Wiring information for external customer powered
(continued)
Output Connection
— —
1. Disconnect controller power.
2. Open the controller cover.
3. Feed the twisted-pair shielded wire through the strain relief.
4. Adjust the wire as necessary and tighten the strain relief.
5. Connect the shield at the power supply side. The power supply
positive polarity connects to the (+) terminal, and the negative
polarity connects to the (-) terminal
• Do not connect the shield at both ends of the cable.
• Use only shielded cable to minimize radio frequency emissions
and susceptibility.
• External loop resistance may be required
6. Close the controller cover and tighten the cover screws.
7. Connect controller power.
8. Configure outputs in the controller.
Figure 1 Wiring diagram for external customer powered
1 4–20 mA output module
2 External device (Recorder/data
acquisition system)
Connector pin number
9
(Figure 1 or Figure 2).
(Table 3 or Table 4).
3 Customer power supply
Table 3 Resistance values for external customer powered
Power supply voltage Loop minimal
resistance
12–18 VDC 0 Ω
18–24 VDC 250 Ω
Figure 2 Wiring diagram for module powered
1 4–20 mA output module
Table 4 Resistance values for module powered
Power supply voltage Loop minimal
resistance
15 VDC 0 Ω
Loop maximal
resistance
250 Ω typical
500 Ω typical
2 External device (HART master)
Loop maximal
resistance
350 Ω typical
English 5