Vaisala MGP261, Руководство пользователя

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3.4 Wiring
3+ 3−
4 ... 20 mA Iout
Iout3 Iout2 Iout1
2+ 2− 1+ 1−
V
in +
V
in −
D + D −
GND
RS-485
18 ... 30 VDC
RS-485
+ −
4 ... 20 mA
Ex ia Input
Iin
(P / T)
2
1
2
Figure 12 MGP261 Screw Terminal Markings and Cable Routes
Connect only de-energized wires. Never switch on the power supply
input before completing the wiring and closing the connection box.
CAUTION!
1. Connect the input, output, and power supply wiring as required in your application. Figure
13 (page 29) shows an example of wiring the device when all inputs and outputs are
used.
• 1 : Optional external pressure or temperature sensor input wiring (Ex ia): route the
cable to the terminal through the M16x1.5 lead-through, above the component board.
• 2 : Analog output, power supply input, and RS-485 wiring: route the cables to the
terminals through the M20x1.5 lead-throughs (1 or 2), below the component board.
• Adjust cable length and attach strain relief (tighten cable glands or use clamps).
The optional Ex ia external sensor input wiring ( 1 ) must be
kept separate from the analog output, power supply, and RS-485 wiring
(
2 ). Always use separate cables on each side of the metal barrier.
CAUTION!
2. See Finalizing Installation (page 30) for instructions on attaching grounding to the probe
grounding terminal.
MGP261 User Guide M212273EN-A
28