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計測機器 Emerson MRLDS-250のPDF クイック・セットアップ・マニュアルをオンラインで閲覧またはダウンロードできます。Emerson MRLDS-250 4 ページ。

Wiring and Configuration

Either 24VAC or 24VDC may be used to power the

MRLDS-250. Connect wiring to the appropriate terminal

locations. Use two wires, between 14 and 22 AWG.

Refer to Figure 3 for AC wiring (left) or DC wiring (right):

Figure 3 - Supply and Power Wiring Options

WARNING: The MRLDS-250 must be powered by:

• A suitable UL 60950/CSA certified power supply

that is isolated from line voltage by double

insulation.

• An appropriately rated UL listed/CA Class 2

Transformer; a 10VA Transformer is

recommended.

• For multiple devices cascaded, a 50VA Class 2

Transformer is recommended.

Figure 4 - Power Wiring of a Device Network

The MRLDS-250 provides an analog output signal that is

proportional to the level of gas detected. Connect two

18 to 20 AWG wires to terminal block positions 5 and 6

(see Figure 5A), noting ground and signal polarity.

Make relay connections (NO, NC, or both) using 18 to 20

AWG wires to terminal block positions 10, 11, and 12

(see Figure 5B), noting normally open, normally closed,

and common connectors.

Document Part # 026-4413 Rev 2

Visit our website at http://www.emerson.com for the latest technical documentation and updates.

Figure 5A - Analog Output Wiring

Figure 5B - Sample Relay Output Wiring

NOTE: For MODBUS network communications wiring,

use only 18-24 AWG shielded twisted pair wire with 120

ohm characteristic impedance.

Figure 6 - MODBUS Network Communication Wiring

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