1. DL manuals
  2. Bacharach
  3. Test Equipment
  4. HGM300
  5. Installation Manual

Bacharach HGM300 Installation Manual

Manual is about: Refrigerant Gas Monitoring System

Summary of HGM300

  • Page 1

    3015-4570 revision 1.1 8/6/03 installation guide bacharach hgm300 to johnson metasys n2 communications adapter electrically isolated n2 port version introduction the bacharach hgm300 to johnson metasys n2 communcations adapter enables an hgm300 refrigerant monitor to communicate with a metasys build...

  • Page 2

    The adapter board mounts on the rear of the hgm300 door. Position the adapter board so as not to interfere with the hgm internal components when the door is shut. Mark (figure 1) and drill the board’s four corner holes and center hole in the door. Install the five standoffs on the rear side of the d...

  • Page 3

    If an rdm800 remote display is not used with the adapter, refer to figure 2 for wiring details. In this case, all wiring between the hgm300 main board and adapter is contained within the hgm300 and the only external cable is the n2 communications cable. 3 of 10

  • Page 4

    If an rdm800 remote display is to be used with the adapter, refer to figure 3 for wiring details. Note that when the rdm800 is used, two rs-485 cables must be run between the hgm300 and rdm800, so plan accordingly. In either case, be sure to set the hgm300’s internal “terminator” slide switch next t...

  • Page 5

    Field hookup of n2 communications the “bas bus” (n2) rs-485 communications port on the adapter is electrically isolated from the hgm300 and from earth ground. This prevents problems with potential differences in “ground” between physically separate locations. Connect the n2 ‘+’ wire to the bas bus n...

  • Page 6

    6 of 10

  • Page 7

    Setting metasys n2 address on communication adapter switches 1-8 on the adapter’s ‘b’ dipswitch are used to set the metasys n2 node address. Possible addresses are 1-255. Use the following technique to set switches b1-b8: divide the desired n2 address by 16. Take the integer part of the result (0-15...

  • Page 8

    Configuring the hgm300 with rdm800 or laptop pc the only hgm parameters that are changeable through metasys are the alarm thresholds. Configuring the hgm for refrigerant type and length of tubing for each zone (zero length to disable a zone) must be done with the rdm800 remote display or a laptop pc...

  • Page 9

    There are several adi points which can provide useful information such as type of refrigerant programmed for each zone, number of zones actually installed in the hgm, the number of zones in alarm, hgm operating mode, etc. Alarm acknowledge options two alarm acknowledge options are supported—auto ack...

  • Page 10

    Communications led indicators see figure 4 for the locations of the communications led indicators. The communications adapter board has four led communications status indicators numbered 1-4. The meanings of these indicators are as follows: led 1 on: adapter is transmitting a poll/command to the hgm...