Bacharach MGS-402 User Manual
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Bacharach MGS-402 User Manual

Gas detection controller for commercial & industrial applications
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MGS-402 Gas Detection Controller
for Commercial & Industrial Applications
Fixed Gas Detection
P/N: 1100-2570 | March 2020 Revision 1
User
Manual

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Summary of Contents for Bacharach MGS-402

  • Page 1 MGS-402 Gas Detection Controller for Commercial & Industrial Applications Fixed Gas Detection User Manual P/N: 1100-2570 | March 2020 Revision 1...
  • Page 2 Bacharach, Inc. warrants to buyer that it will convey good title to this product. Bacharach’s liability and buyer’s remedy under this warranty of title are limited to the removal of any title defects or, at the election of Bacharach, to the replacement of this product or parts thereof that are defective in title.

  • Page 3: Table Of Contents

    Power Wiring ........................8 3.5.1 Connecting the Main (100-240 VAC) Power ....................8 Sensor Output & Modbus Connections ................. 9 3.6.1 MGS-402 Gas Detection Controller Network .....................9 3.6.2 Integration with Building Management System ..................11 Connecting External Alarms ..................11 3.7.1 Overview ..............................11 Reinstalling MGS-402 Lid ....................
  • Page 4 MGS-402 User Manual Operation ............14 Overview ......................... 14 4.1.1 Main Function .............................14 4.1.2 Power Up ..............................14 4.1.3 Channel number keys ..........................14 Controller Setup ......................14 4.2.1 Modbus Setup .............................14 4.2.2 Relay Setup ..............................16 Gas Detection System Test ................... 17 Modbus ............

  • Page 5: Introduction

    1. Introduction 1.1 About this Manual Thank you for investing in a Bacharach MGS-402 Gas Detector Controller. To ensure operator safety and the proper use of the controller, please read the contents of this manual for important information on the operation and maintenance of the instrument.

  • Page 6: General Safety Statements

    / or hazardous locations. Failure to comply may result in personal injury or death. WARNING: Always remove AC power before working inside the MGS-402 enclosure and exercise extreme care when accessing the products interior. Only qualified electrical maintenance personnel should perform connections and adjustments.

  • Page 7: Product Description

    In addition to being a Modbus master to the MGS-410 gas sensors, the MGS-402 acts as a Modbus slave for ease of integration into a building automation system (BMS) or programmable logic controller (PLC). The controller also features two analog outputs which may enable monitoring gas detector levels remotely.

  • Page 8: Intended Use

    2.2 Intended Use The MGS-402 provides audio-visual alerts and information pertaining to the status of a centralized gas detector network. This information allows concise, at-a-glance notification of any alarm or fault status regarding a connected gas detector located outside the monitored space, as required by industry safety standards (EN 378, ASHRAE 15).

  • Page 9: Front Panel

    MGS-402 User Manual 2.4 Front Panel Figure 2-2 - Front Panel Layout Front Panel Description Integrated visual alarm in bezel Controller Power & Fault LEDS Channel 1 and 2 mute alarm buttons Power, Fault, Low Alarm, High Alarm LEDs; each channel M16 Cable Glands (×6)

  • Page 10: Components

    High Alarm Relay 2.6 Communication Features The MGS-402 Gas Detection Controller features full two-way communications via an RS-485 interface. Modbus RTU is the communication protocol standard. The controller is configured as a Modbus master and can be the centralized controller for a two sensor gas network and also has a Modbus slave port for connection to a BMS / fire safety panel for a complete gas detection solution.

  • Page 11: Installation

    The MGS-402 Gas Detection Controller is design for use in a small gas detection network that could be in mechanical rooms, warehouses, cold storage or freezers to help comply with international safety standards (EN 378, ASHRAE 15, CSA-B52). The MGS-402 is a NEMA 4X (poly carbonate) or IP66 rated enclosure and can be placed in environments from -40 C to +50 C ambient temperatures.

  • Page 12: Mounting The Gas Detection Controller

    WARNING: Copper conductors for connection to main power supply and output relays must be made in accordance with local building codes. Locate the AC power input terminal block (item 9 in “Figure 2-3 - MGS-402 Layout” on page 7) and remove it from the controller.

  • Page 13: Sensor Output & Modbus Connections

    Modbus network limits. Care needs to be taken to account for voltage drops between the controller and the MGS-410 gas sensors and standard Modbus network limits. The furthest distance the MGS-410 can be from the MGS-402 controller is 1000ft (305m) when using 20 - 16AWG conductors for the sensor power and Modbus connections.
  • Page 14 +24 VDC Terminal Block 3.6.1.2 Connecting the Modbus network from the MGS-402 to the MGS-410 1. Locate the Modbus/Sensor terminal block in the MGS-402 controller (item 2 in “Figure 2-3 - MGS- 402 Layout” on page 7). 2. Using one of the M16 cable glands feed the Belden 3106A or equivalent cable through the cable gland and connect to the Modbus/Sensor terminal in the following manner.

  • Page 15: Integration With Building Management System

    (1) Remote Silence input to interface with a momentary push button that may be in a different location than the MGS-402. See items 1 (Analog outputs), 7-9 (Form C Relays) and 4 (Remote Silence) in “Figure 2-3 - MGS-402 Layout” on page 7.

  • Page 16: Reinstalling Mgs-402 Lid

    MGS-402 User Manual 3.8 Reinstalling MGS-402 Lid WARNING: DO NOT leave excess cable inside the gas detector housing. Failure to comply may result in damage to the product. CAUTION: When installing the sensor ribbon cable, care must be taken to ensure the proper orientation of the connector at both ends of the cable.
  • Page 17 MGS-402 User Manual 6. Ensure no cables are interfering with the sensor module and close the lid. Using a 5/32″ (4 mm) hex key / allen wrench, tighten the lid screws in an “X” tightening pattern: Figure 3-6 - Tightening Pattern...

  • Page 18: Operation

    4.2 Controller Setup 4.2.1 Modbus Setup Configure MGS-402 to BMS. If using the MGS-402 to interface with a BMS as a slave the Modbus protocol needs to be configured. (Refer to “item 3, Figure 2-3 - MGS-402 Layout” on page 6.)
  • Page 19 MGS-402 Back of Lid Label Using switch 1 (SW1) on the underside of the lid of the controller use setting 4 to acknowledge whether the MGS-402 will need to have the terminating resistor engaged. Please see Modbus protocol for best practice. Switch 1...

  • Page 20: Relay Setup

    4.2.2.1 Form C Relays The (3) form C relays that are included in the MGS-402 (fault, low alarm, high alarm) can be configured to be fail safe (if power is lost on the relay it will be set to its fault or alarm state until power is restored). The fail safe mode can be configured for each of the individual relays and is done using SW1 settings 1, 2 and 3.

  • Page 21: Gas Detection System Test

    MGS-402 User Manual 4.3 Gas Detection System Test After installation and power-up of the MGS-402 Controller, one should verify that the instrument and connected devices are functioning as intended. The following steps should be considered in the commissioning. 1. Inspect the MGS-402 Controller and verify the following:...
  • Page 22 410 Refrigerant Detector(s) so to place them into an alarm state. Verify the proper function of the MGS-402 and MGS-410 audio / visual alarm functions as well as verify the proper function of connected relay peripherals and analog and Modbus monitoring devices.

  • Page 23: Modbus

    Communication parameters may be set via the configuration switches. The MGS-402 controller acts as a Modbus master device on the detector side, and as a Modbus slave device on the BMS side. Refer to the MODBUS tables found on page 15.
  • Page 24 MGS-402 User Manual Register Func Code 04 Item Group Notes Address (read input registers) 30003 Sensor 1 Modbus error code Sensor 1 Exception code from Modbus standard 30004 Sensor 1 concentration Sensor 1 0-65535 30005 Sensor 1 status code Sensor 1...
  • Page 25 MGS-402 User Manual Register Func Code 04 Item Group Notes Address (read input registers) 30027 Sensor 1 SID Text Char 7,8 Sensor 1 ASCII characters 30028 Sensor 1 UID Text Char 1,2 Sensor 1 ASCII characters 30029 Sensor 1 UID Text Char 3,4...
  • Page 26 MGS-402 User Manual Register Func Code 03/06 Item Group Notes Address (Read/preset) 40005 Parity Controller- 0 = None related 1 = Odd 2 = Even 40006 Controller UID Char 1,2 Controller- ASCII characters related 40007 Controller UID Char 3,4 Controller-...
  • Page 27 MGS-402 User Manual Register Func Code 02 Item Group Address (read input status) 10001 Sensor 1 Low Alarm Flag (0 or 1 = alarm) Sensor 1 10002 Sensor 2 Low Alarm Flag (0 or 1 = alarm) Sensor 2 10003...

  • Page 28: Diagnostics & Troubleshooting

    MGS-402 User Manual 6. Diagnostics & Troubleshooting 6.1 FAULT CODES Code Critical Fault Possible Causes Remedy 0001 CHASSIS TEMP Chassis temperature outside the range Reduce ambient temperature or check for of -40 to +50C power supply malfunction. 0002 RS485 MSTR BUFR...

  • Page 29: Additional Information

    Common household appliances can be disposed of using special collecting and recycling facilities. However, this device has not been registered for household usage. Therefore it must not be disposed of through these channels. The device can be returned to your national Bacharach Sales Organization for disposal. Contact Bacharach if you have any questions.

  • Page 30: Parts And Accessories

    Prior to shipping equipment to Bacharach, visit www.mybacharach.com for a Returned Merchandise Authorization Number (RMA #). All returned goods must be accompanied by a RMA #. Pack the equipment securely (in its original packing, if possible), as Bacharach cannot be held responsible for any damage incurred during shipping to our facility.
  • Page 31 MGS-402 User Manual THIS PAGE LEFT BLANK INTENTIONALLY. 1100-2570 Rev 1...
  • Page 32 MGS-402 User Manual Bacharach, Inc. 621 Hunt Valley Circle, New Kensington, PA 15068 USA Pittsburgh, PA USA | Dublin, IRE | Stanardsville, VA USA | Toronto, CAN www.mybacharach.com | help@mybacharach.com 1100-2570 Rev 1...

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